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Recent controversy on the adequacy of quantum and classical mechanics [Psyche 1995] for explaining consciousness has shown that the interrelations between physics and psychology still attract attention of scientists and philosophers, and there are questions requiring more consideration. The problem of consciousness naturally arises in any science concerning human (or human-like) behavior, such as psychology, linguistics, or artificial intelligence. Still, any one of these sciences has much of its own to investigate, without special reference to conscious action. One might expect that the same holds for physics as well.

Most generally, there are three groups of questions:

1. What can psychology give to physics?
2. What can physics give to psychology?
3. Is there any way to combine these sciences?

For brevity, I mean all the variety of sciences related to human behavior and consciousness under "psychology", from neurophysiology to philosophical treatment. Similarly, all the variety of physical sciences together with metaphysical generalizations is assumed under "physics". Of course, the same questions may be asked about any particular branch in psychology or physics; this requires a specific projection of the general discussion.

In the literature, the first of the three groups of questions is represented exclusively by the problem of introducing observer into quantum mechanics. I discuss this problem in Section 2. Still there are other aspects of applicability of psychological concepts in physics, and I present some considerations on that in Section 3, which is mainly devoted to the role physics may play in psychological research. Section 4 describes a new interdisciplinary area of science, which I name physical psychology; the subject of this science is specified, and some of its methods are discussed. As an example, a mechanical model of temperament is outlined in Section 6, which is preceded with a brief summary of Newtonian mechanics required to understand the model (Section 5). Concluding remarks indicate possible applications and the ways of generalization of the mechanical model, including the description of consciousness in physical psychology.

There are different schools in both psychology and physics, and I cannot equally speak about all of them. In the early 1980s, there was a wide discussion of similar questions in the scientific circles of the former Soviet Union [Tsekhmistro 1981; Kravchuk 1983; Sudakov 1983]. These ideas are less known to the English-reading audience and may therefore provide new possibilities for extending the range of related topics. That is why, in this article, I have chosen to base my argument on the Russian scientific tradition. It is assumed that the reader is acquainted with American and European literature on the subject and may compare my approach with it. Accordingly, most references in this article are to the works of Russian-speaking researchers, though I tried to find the English translations where possible.

In a few words, my position might be stated like this:

1. Nature is a hierarchy of objects, and each level of this hierarchy should be studied with methods appropriate at this level, so that the hierarchy of sciences reflects the natural hierarchy of the world. Thus, physics studies physical objects that are different from psychological objects; still, the both kinds of objects exist in Nature independently of whether somebody is studying them or not. The development of any science is the process of simultaneous formation of its subject and its methods.

2. The hierarchy of Nature is not rigid, it manifests itself as different hierarchical structures, so that the levels distinguished in one structure may be fused together in another, and vice versa. Every two levels of the hierarchy imply an intermediate level, combining the features of the both. In science, it means that for every two sciences one may construct another science, lying "between" these two. In particular, one may seek for some combination of physics and psychology, which, evidently, is not unique since there can exist sciences intermediate for this combination and the "pure" physics or psychology.

3. The levels of hierarchy are qualitatively different, and no one of them can be reduced to another, or deduced from the other levels. In particular, psychological phenomena cannot be reduced to physiology, chemistry or physics, or deduced from them. Human psychology is drastically dependent on social factors, and consciousness should be considered as a collective effect arising from thousands acts of communication between many people, rather then from some neural or physical processes in one's brain. However, consciousness would be impossible without appropriate premises, one of which is the admirable versatility of the human brain.

These brief formulations are, to some extent, unfolded in the following discourse, though I do not try to argue for them specifically, since this would lead me far from the subject of this article.

2. The Observer in Physics.

But are quantum and classical theories so different as it seems? Actually, there are many formulations of the both, sometimes presenting rather smooth mutual transitions between them [Mensky 1983]. And is there any real need in the observer?

From the practical side, the task of a physicist is to predict the results of certain manipulations with material bodies using some pre-defined procedures called physical methods. The registration of some result follows a formal scheme which is called measurement. When an experimenter reports his results to the physical community, the main efforts are spent to make the experimental procedure as close to a common standard as possible, and to reduce the influence of any side factors, including experimenter's mind and personality. Thus the very idea of measurement assumes the extinction of the observer, and this holds equally for classical and quantum measurements. Physical theory refines the schemes of measurement abstracting from the last traces of individuality; the whole of physics becomes then fully observerless.

The same idea can be put another way. Physical science deals with some formal model of observer, rather then with a real human being, and it is this model that is reflected in the form of the physical theory. Such formal observer is just a representation of some standard procedure, and the observer's activity is reduced to the implementation of a sequence of operations, which could be much better performed by some automatic device. In this sense, the observer is present in any part of physics, and not only in quantum mechanics. It is only the rules of observation that change from one physical science to another depending on their specific methods.

How the observer is represented in classical mechanics? There are many formulations of classical mechanics, and each formulation has its own way of postulating the formal behavior of the observer; still, one may say that all these observers are physically equivalent since they lead to the same dynamics. For example, the traditional Newtonian mechanics models the observer introducing the conception of reference frame. To observe the classical behavior of a physical system, the observer should be present in any point of the three-dimensional space in the same moment of time, to become aware of any event immediately. Such observer is effectively infinite and coincides with the whole of the Universe. This may be possible if the movements considered are much slower then the movements involved in the process of measurement (adiabatic limit).

The relativistic generalization of classical mechanics is obtained when the movements described are as fast as, or even more fast than the processes implied by the measurement scheme. To maintain the conception of the reference frame, physicists have to associate it with the own movement of the observer, thus mixing space and time in the four-dimensional space-time. In other words, the reference frame is not a static prerequisite, but rather the process of establishing the connection between different spatial points. Relativistic observer is essentially local and cannot be aware of any events occurring in very far spatial points.

Quantum mechanics generalizes the classical conceptions in the opposite direction, so to say. While relativism speaks of a very small observer, the observer of quantum theory is extremely big, even much bigger than the classical (infinite) observer. Each point of its space (reference frame) becomes a whole three-dimensional space, and each point of this internal space is supposed to be somehow structured too, when it comes to accounting for spin and other group features. For example, the infinity of atomic physics is practically about several microns, or even fractions of a micron, which can be considered a point in many macroscopic movements. Theory idealizes this scale difference, taking the practical infinity for the true infinity; this is the source of formal contradictions arising when one tries to comprehend the transition from quantum processes to macroscopic measurements, from one level of hierarchy to another.

Usually, physicists clearly understand the limited applicability of theoretical abstractions and easily switch from one theory to another depending on the circumstances. Thus, the region between atomic and macroscopic lengths is better described by quasi-classical approach, and the same nucleus may be considered either as a solid body, or as a Fermi gas, or as a quantum liquid. Only the most deep theoreticians can forget the reality and raise a controversy about nothing. Unfortunately, many popular relations of physical theories lack indications to the limits of their applicability, so that the readers might be deluded by some peremptory claims.

In a quite analogous way, the abstraction of observer might be defined for any other branch of physics: thermodynamics, electromagnetism, hydrodynamics, and so on. Similarly, there must be natural transitions between physical sciences. For example, adiabatic processes in thermodynamics manifest quite classical behavior, so that phenomenological parameters like temperature, volume, or pressure, may be used as generalized coordinates.

3. Physical Methods in Psychology.

There are different ways of approaching psychology from the physical side. One way is to treat a human being as a physical object, albeit very unusual one. Then we can physically act on that object and observe its physical reactions, trying to catch the apparent regularities in some formulas. For instance, exposing a person to some flashing lights, various sounds, electric shocks, sequences of words or even congruous texts, music or movies, may result in person's reactions, like pressing a button, saying something, going to a nearby supermarket and buying a new hat, and so on. Physical measurement does not worry about the specific personal sense of these reactions; all that is relevant is distinguishing a number of physically different outcomes which can be somehow labeled with a numerical parameter. Such procedures can be highly formalized, and they differ from physical experiments proper only in their object. This is a psychological study in the least degree, and it may be also considered a kind of physical research, namely psychological physics, or psychophysics. The most popular psychophysical methods include various timing procedures, the measurements of transmission characteristics (for example, the dependence of evaluated sound pitch on the sound frequency), and numerous threshold measurements (quite analogous, say, to ionization potential measurements in atomic physics) [Zabrodin and Lebedev 1977].

Here, the key point is the usage of physical criteria for distinguishing different reactions. Thus, if one is interested in physiological consequences of some manipulations with a human being, this should be called psychophysiological rather then psychophysical investigation. likewise, one might consider the influence of stress onto speech production; this is a psycholinguistic—study. Psychological research would center on specifically psychological phenomena, such as the change in the motivation structure, or the level of self-respect. It does not matter how formal the means of this study are, as long as the focus on the psychological side of the problem is preserved. In fact, psychological concepts are not a bit less abstract than the most abstruse constructions in theoretical physics. The term "the will" may seem somewhat more clear than "autoionization", but this is mostly due to the more evident manifestation of will in our everyday life, while autoionization is not so easily observed, though it is much more common in Nature.

There is an important distinction between the higher and lower levels of hierarchy. Any psychological event can always be considered from the physical side as a sequence of physical events, while there may be physical events that do not assume any psychological content, and some physical events may accompany many psychological events. However, since human knowledge about the physical world is governed by people's practical needs, science only deals with events related to some human activity, and it would be quite admissible to reveal some relation to psychology in any known physical event.

Now, it is evident that psychophysics is not the only way to combine physics and psychology. Since any movement in the mind is realized as a sequence of physical events, mental phenomena must not violate physical laws, and one may predict some gross features of thinking for a number of hypothetical creatures living in the worlds with different values of some fundamental physical constants. Thus, another application of physics to psychology is to consider the influence of a definite structure of the physical world to mental processes [Dyson 1979].

One more possibility is to build a "compound" theory, where the influence of mind on physical movements is introduced explicitly as some phenomenological constraint, and in turn, physical laws are regarded as the constraints for the possible changes of mind [Korenev 1977, 1981]. Unfortunately, this approach did not attract many scientists, because the construction of such theory requires a tremendous technical work.

Now, let us imagine that one carries out a purely psychological research, and the results strongly resemble the behavior of some physical system. The researcher might trace this analogy as far as it is possible, and apply a well developed physical theory to the regularities observed at the psychological level. This seems even more admissible since physics itself has been extensively practicing such formal borrowing of theories since pre-historic times. I have already mentioned the mechanical treatment of adiabatic thermodynamic processes. Virtually, one can find no physical theory that has not ever been influenced by some other science, either physical or not.

This application of physical theories and mathematics in psychology may be rather superfluous, when physics is taken only as a source of useful metaphors [Nalimov 1981]. There may also exist less metaphorical theories, trying to predict the processes in some simple situations solving the equations of dynamics [Ivliyev 1988].

Modern physics is rather broad-flung, and it includes many models far from the traditional description of dynamics. Fractals and neural networks became very popular nowadays in the physics of condensed media and surfaces; also, there are theories examining computational or informational properties of physical systems [Bernstein and Levine 1975; Caianiello 1992]. Sometime, these theories may lead to a new revolution in physics, and they can also be applied to psychological problems to obtain an explanation of existing mental structures. One such model, combining quantum-mechanical and informational conceptions with a general hierarchical approach has been reported recently [Avdeev and Ivanov 1993; Ivanov 1994]. An explanation of the discrete nature of musical pitch perception has been given, so that the properties of all existing musical scales could be described with a few a priori computable values. Similar scaling was discovered in visual perception as well [Ivanov 1995].

When the formal constructions of physics are applied to a psychological problem, they do not change the psychological orientation of research in general. Since it is psychological phenomena that are to be described, the parameters and variables of the theory must be psychologically interpreted, and they loose any relation to their physical counterparts. Accordingly, the results formally obtained in this model are psychological, rather than physical. That is why one can speak of such theory as a branch in psychology, which could be called physical psychology.

4. Foundations of Physical Psychology.

This formal transfer could only be possible if there were an actual similarity of methods of the both areas of science. Luckily, such similarity does exist. In the most general form, it ascends to the universal logic of scientific research, which reflects the unity of the Universe. Naturally, specific methodological parallels may be found too. One of them is the general scheme of scientific experiment, assuming the registration of some object's response to a standard external influence [Vygotsky 1983]. The object is thus considered to be a system, that is, it transforms some input into some output trough a sequence of internal states. Most clearly, this approach manifests itself in the matrix formalism of quantum scattering theory, and in the stimulus-reaction scheme of classical behaviorism. The alternative class of scientific methods may be called structural approach, and the main goal of a structural study is the explication of the internal integrity of the object, connecting its distinct parts into the whole, opposed to its environment. One may take the atomic paradigm in physics or gestalt psychology for the examples. Recent research often combines structural and systematic methods, which leads to the consideration of the object's development, and the stages of this development become represented in it as different levels of its inherent hierarchy [Leontiev 1978; Vekker 1981; Eliseyev 1983; Ivanov 1994, 1995].

Physical psychology does not aim to obtaining any new psychological data, leaving this to psychology proper. The models of physical psychology should conform to existing psychological data and give reasonable results where it is possible to measure some of their parameters. However, physical psychology could help to understand the meaning of the existing experimental procedures in psychology, and even suggest new quantities that psychologists might measure. Still, the methods of physical psychology should not replace the specifically psychological methods, especially where there are no physical models available.

Also, physical psychology is not a branch of physics, since its subject differs from the subjects of physical sciences. Physical psychology borrows ready models from physics, but it applies them to the systems of quite another type, in which the processes do not directly correspond to physical processes in a system of material bodies. One might say that physical psychology is the physics of the ideal, in contrast to the ordinary, "material" physics. But, since the ideal and the material are just the two sides of one reality, one should expect that some features of physical models in psychology would somehow manifest themselves in physical research proper, and there would be a way back, from psychology to physics.

For physical psychology, a person is not only a material body having a definite movement in the physical space-time. The main interest concentrates on internal, subjective processes that cannot be characterized with reaction delays, sensory organ attenuation curves, spatial distribution of excitation in the brain and interactions of its parts, the mechanics of muscles etc. That is why the subject of physical psychology does not coincide with the subject of psychophysics, which describes just these external manifestations of psychic processes. In a way, this difference is similar to the difference of the physiology of higher neural processes and neurophysiology: the former studies the physiological mechanisms underlying psychological phenomena, while the latter describes these phenomena in terms of neurodynamics [Luria 1973].

Since theoretical physics widely exploits mathematics of any kind, it might be expected that the same mathematics would be applicable to ideal, psychological processes. This application, however, is different from that of mathematical psychology. The latter studies the possibility of correlating psychological entities with mathematical objects as such, the ways of mathematization. Naturally, one or another mathematical representation is a necessary stage in the development of a physical model, but mathematics is only a background for physical theory, the principal concepts of which lie beyond any mathematics. In physical psychology mathematics is only introduced through a physical model, and does not require direct mathematical analysis of psychological data. For example, there are situations in physics, when the same model is described with different mathematics (like the Heisenberg and Shrödinger representations in non-relativistic quantum mechanics); when this model is transferred to psychology, all its mathematical forms are transferred with it, and may be used without any special reservations as soon as the analogs of the corresponding quantities are discovered. On the other side, the mathematical methods of psychology cannot always be related to any physical model.

Thus, physical psychology has a definite subject different from the subjects of psychophysics and mathematical psychology; it combines the elements of physics, mathematics and psychology never coinciding with either of them.

5. The Scheme of Newtonian Mechanics.

Also, there are more complex solutions, when each component of vector x oscillates with its own amplitude and phase. For example, the two-dimensional oscillations include the movement along an ellipse, and the circular movement around the equilibrium point. In this latter case, the velocity and acceleration of the material point are constant in the absolute value, and it is only their orientation that changes. This means that not only the total energy is conserved, but both the kinetic energy and the potential energy are constant too.

6. Motivation and temperament.

According to the general theory of A. N. Leontiev [Leontiev 1978; Ivanov 1995], human activity is governed with some motive and is realized in a sequence of actions directed to their specific goals. People are unaware of their motives, and it is their goals that are conscious. In the course of action, the motivation may change, so that one activity flows into another. Sometimes, the former goals become motives, and a motive may become just an intermediate goal.

Let us imagine, that, in some situations, a motive can be represented by a point in some motivation space. The goals belong to the same space, to enable the free transformation of goals into motives, and motives into goals. Now, human activity is represented by a trajectory x(t) in the motivation space, that is, by a sequence of points representing the current goals. The motive of this activity is naturally represented by some attracting center in the motivation space, so that the activity can be thought of as a solution of the equation of motion, just like Newton’s second law in classical mechanics.

Within this analogy, the mass m of the material point may correspond to the internal inertia of mind, which is an important personal characteristic. The greater is the mass, the less readily the person yields to external influences (which can be represented by some forces in the mechanical model). The velocity v naturally describes the rapidity and the direction of an action; this is the example of characteristic, that has no direct psychological analog, though it is quite compatible with the psychological conceptions. As for momentum p = mv, the corresponding psychological characteristic might be called the persistence of the activity, that is, its ability to preserve the same course in spite of any deflecting forces. Quite naturally, persons with high inertness are more persistent in their activity, and the higher is the rate of activity, the less noticeable is the effect of other activities on it.

In Newtonian mechanics, the special place belongs to acceleration. Any change in the state of motion assumes a non-zero acceleration, and it is acceleration that is felt by a classical observer as a mechanical event. When the observer is moving without acceleration, the movement of any material point is described with the same equations of motion, as for the motionless observer. This means that all the reference frames moving without acceleration are mechanically equivalent; they are called inertial frames. It is natural to put forward the hypothesis that the analog of acceleration in the psychology of activity is the subjective feeling of all the forces acting on the person; this feeling may be associated with the person's emotions.

Now, the general picture of human activity looks as follows: a person's interaction with the world (including the person's body, and the brain) results in some distribution of forces in the motivation space of the person; this forces excite definite emotions in the person, which change the state of motion, that is, the rapidity of changing actions and goals, and the direction of this change.

The immediate inference of the model is that the same force will excite less emotions in a person with high inertia, since acceleration equals force divided by mass. This is the well known low emotionality of the people with phlegmatic temperament. Following this line, one could ask whether the other classical temperaments (sanguine, choleric, and melancholic) might have a mechanical explanation too. It is well known, that the conception of the four temperaments takes its origin in the Ancient Greek philosophy, and it has been physiologically interpreted in Pavlov's theory of reflexes. The temperaments are distinguished according to the values of three parameters: strength, mobility, and balance. Thus, the anguine temperament assumes strong, mobile, and well-balanced nervous processes, while the choleric temperament is poorly balanced and the phlegmatic temperament lacks mobility; all the weak temperaments are called melancholic. The mechanical interpretation of these parameters of temperament can be given on the basis of the principal law of dynamics: force equals mass times acceleration, F=ma. One can notice that the strength of temperament characterizes the degree of a person's sensitivity to external circumstances. In the mechanical language one may say that the environment acts with less force on a person with the greater strength of temperament, that is, the absolute value of the force is inversely related to the temperament strength. The relation of mass to inertia (the inverse of mobility) has already been indicated. Quite naturally, balance is characterized by the value of acceleration: the completely balanced state of the system assumes zero acceleration.

With these assumptions, the sanguine temperament must be characterized with small F, which, at medium m, results in low accelerations a. Since the phlegmatic temperament is characterized with a significantly higher mass, even much greater forces cause rather low accelerations, and a phlegmatic person keeps balance in a wider range of situations. The opposite is valid for the choleric temperament, which assumes rather low inertia: even a small force can break the balance in a choleric person. As for the melancholic temperament, it is mostly characterized with a rather great sensitivity to the processes in the environment, that is, with high values of F. The effect of that on the person's activity may be different, depending on the person's inertia. Actually, there are three kinds of melancholic temperament corresponding to the three other temperaments. Very inert persons remain balanced in spite of all their strong interactions with the world. Medium inertia, like that of a sanguine person, results in much higher emotional reactions. The most weak type of melancholic is characterized with low inertia; this is an extremely vulnerable person, feeling the flood of emotions at any turn of the situation.

The mechanical treatment of temperament differs from the traditional approach in that the two of the parameters of temperament, strength an balance, are usually assumed to be individual constants, while force and acceleration in the mechanical model are true dynamic variables, which may change very much in the course of activity. One solution of this problem could be that temperament reflects the averaged features of activity, and its parameters should be related to the time-averaged values of force and acceleration. For many periodic and quasi-periodic movements, these variables vary in a small range in the absolute value, assuming any possible orientation. The simplest case is the circular motion described in the previous section. The absolute values of force and acceleration are exactly constant for this movement, and they can be directly interpreted as the parameters of temperament.

The mechanical model of activity can be developed in detail, finding more analogies between physics and psychology. My purpose is only to demonstrate how physical theories can be reinterpreted to become the theories of some psychological phenomena. As an example of a more complex result, I would like to mention the possible application of this model to the description of neuroses. Normally, no place in the motivation space is inaccessible for human activity: for any given point there should always exist some trajectory containing this point. Still, the person's interaction with the world may sometimes result in a singular potential, breaking the simple topology of the motivation space. The well known physical example is Coulomb potential of a charged point, assuming the infinite value at the position of the charge. In such cases, activity may come very close to the point of singularity, but it will just move around, never achieving this point. The existence of such forbidden area in the motivation space corresponds to the clinical picture of neurosis. The mechanical model permits the description of different kinds of neuroses, depending on the singularity type. As one can see, neurosis cannot be overcome by the own activity of a person, and the treatment of neuroses requires the change in the person's environment removing the singularity from the motivation space.

7. Conclusion.

Also, one can borrow some other theory from physics, and apply it to the same problem. For instance, quantum mechanics would be useful to expand the description of an individual action, which in the above model is represented by the momentary goal and persistence of activity. In the quantum model, the point in the classical configuration space will be replaced with some internal space, as it was described in Section 2. Then, the action may be considered as a process in this internal space, resulting in a probabilistic outcome at the level of activity.

Surely, the most interesting problem of physical psychology is the description of consciousness. However, the origin of consciousness cannot be discussed within physical psychology. One can only speak about representing consciousness in any physical-psychological model using the concepts and laws appropriate for this model. Thus, in the theory of activity described above, consciousness is referred to the level of action, and the person is not aware of the motive of activity. This can be easily understood if one regards the goal (the point in the motivation space) as a focus of awareness; the activity is then interpreted as the gradual shift of this focus from one goal to another. Since the points of minimum potential energy (representing the possible motives) do not, in general, lie on the trajectory of activity, the motives remain unconscious. This is the most obvious in the case of circular motion, with the motive in the center of the circle, and the goals always equally distanced from the motive. Actually, there may be some processes of motivation, which make the discovery of the motive of activity a special goal. Some activities will include motivational actions, and some will not, depending on whether the motive point lies on the trajectory of activity or not.

Other physical models may give a more detailed description of consciousness. Thus, physics has discovered many cases of collective motion, when the different parts of the system move in accord for a comprehensible time. Collective phenomena, such as solitons in liquids and solids, plasma pinches, autoionization states in atoms, and many others, appear due to some kind of non-linearity, that is, the interaction of a physical system with itself mediated by its environment. As G. R. Mulhauser [Mulhauser 1995] has indicated, every body in the cosmos is in many ways bound to its environments, and consideration of an isolated system can be possible only in abstraction. The more so for the human brain, which is eventually just the device to perform universal reflection, virtually interacting with the whole world. There is experimental evidence that consciousness is essentially a collective effect arising from the variety of interpersonal communications [Vygotsky 1986; Leontiev 1978]. This collective nature is reflected in the organization of the human brain and the interplay of the neural processes accompanying human activity [Luria 1973]. That is why the physical theories of non-linear phenomena may add more light to the problem of consciousness.

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