Tree of knowledge system

The tree of knowledge (ToK) system is a theoretical approach to the unification of psychology developed by Gregg Henriques, associate professor and director of the Combined-Integrated Doctoral Program in Clinical and School Psychology at James Madison University.[1]

Gregg Henriques' Tree of Knowledge System

The outline of the system was published in 2003 in Review of General Psychology.[2] Two special issues of the Journal of Clinical Psychology in December 2004[3] and January 2005[4] were devoted to the elaboration and evaluation of the model. The latest evaluation of this model appeared in a December 2008 special issue of Theory & Psychology''.[5]

The official website on the tree of knowledge system claims that the ToK is

a new unified theory of knowledge that maps the pieces of the scientific puzzle in a novel way that connects Quantum Mechanics to Sociological processes and everything in between into a coherent whole. The most novel aspect of the ToK is its visuo-spatial depiction of knowledge as consisting of four dimensions of complexity (Matter, Life, Mind, and Culture) that correspond to the behavior of four classes of objects (material objects, organisms, animals, and humans), and four classes of science (physical, biological, psychological, and social).[6]

The "problem of psychology"

Henriques argues that the most difficult problem in psychology as a discipline is that while there is incredible diversity offered by different approaches to psychology, there is no consensus model of what psychology actually is.[7][8]

According to the ToK system, the "problem of psychology", (as Henriques puts it), is that a clear definition, an agreed upon subject matter, and a coherent conceptual framework have eluded its students for its entire history. He further argues that the patent tendency of psychology has been toward theoretical and substantial fragmentation and increasing insularity among the "specialties." In other words, the discipline has fragmented into different schools of thought and methodology, with no overall framework to interpret and integrate the research of different areas. At its best, the different approaches are a strength of psychology; different approaches lead to novel ideas, and prevent psychologists from clinging to a paradigm that fails to explain a phenomenon. At its worst, adherents of one particular school cling to their beliefs concerning the relative importance of their research and disregard or are ignorant of different approaches. In most cases, individual psychologists have to determine for themselves which elements of which perspective to apply, and how to integrate them into their overall understanding.

The reason for psychology's fragmentation, according to the ToK, is that there has been no meta-theoretical frame that allows scholars to agree on the basic questions that need to be addressed. As such, the different schools of thought in psychology are like the blind men who each grab a part of the elephant and proclaim they have discovered its true nature. With its novel depiction of evolving dimensions of complexity, the ToK allows scholars finally to see the elephant. In his 2003 Review of General Psychology paper,[9] Henriques used the ToK System with the attempt to clarify and align the views of B.F. Skinner and Sigmund Freud. These luminaries were chosen because when one considers their influence and historical opposition, it can readily be argued that they represent two schools of thought that are the most difficult to integrate. Henriques used the meta-perspective offered by the ToK to argue how one can retain the key insights from each school of thought, identify errors and points of confusion, and integrate the insights into a coherent whole.

Cultural and personality psychologist, Michael Katzko,[10] however critiques Henriques' position on "the problem of psychology":

There is a very good reason for skepticism regarding the repeated claims that the one unique problem of psychology, applicable across the entire discipline, has been identified and that the ToK System solves it. The reason is given by the detail with which alternatives have been worked out, be they historical studies of institutional development or critical commentaries on the rhetorical structure of psychology's literature.[11]

Tree of knowledge

In one way, the tree of knowledge system reflects a fairly common hierarchy of nature and of the sciences that has been represented in one way or another since the time of Auguste Comte, who in the 19th century used a hierarchical conception of nature to argue for the existence of sociology. Despite its surface agreement with a standard conception, the ToK System offers a set of ideas that have added implications for both ontology and epistemology. The ontological claim made by the ToK, (and depicted pictorially above), is that cosmic evolution consists of four separable dimensions of complexity, namely matter, life, mind, and culture. The dimension of complexity argument is arguably one of the most complicated aspects of the system. Many have argued nature is hierarchically leveled; for example, a list of such levels might be subatomic particles, atoms, molecules, cells, organ structures, multi-celled organisms, consciousness, and society is common. The ToK System embraces a view of nature as levels, but adds the notion that there are also dimensions of complexity. The difference can be seen pictorially. A view of nature as solely consisting of levels would have a single "cone" of complexity, whereas the ToK depicts four "cones". The ToK posits that a separate dimension of complexity emerges when a process of selection operates on a unit of information. Thus, according to the ToK, natural selection operating on genetic combinations gives rise to the dimension of Life; behavioral selection operating on neuronal combinations gives rise to the dimension of Mind; and justification operating on symbolic combinations gives rise to Culture.

The ToK system also offers a new epistemology that Henriques believes will move toward what E.O. Wilson termed consilience.[12] Consilience is the interlocking of fact and theory into a coherent, holistic view of knowledge. The ToK offers alternative perspectives on how knowledge is obtained because it depicts science itself as both emerging out of culture and as a unique type of "justification system" that is based on the values of accuracy and objectivity.[13] A "justification system", according to Henriques, refers to any belief system that emerges that coordinates the behaviors of individual humans to human populations. The four dimensions of complexity correspond to four broad classes of science: the physical, biological, psychological and social sciences.

Matter

The dimension of matter refers to the set of material objects and their behaviors through time. In accordance with modern cosmology, matter is theorized to have emerged from a pure energy singularity at the Big Bang. Space and time were also born at such a point. Nonliving material objects range in complexity from subatomic particles to large organic molecules. The physical sciences (i.e., physics, chemistry, geology, astronomy) describe the behavior of material objects.[14]

Life

The dimension of life refers to organisms and their behaviors through time. Living objects are considered a unique subset of material objects. Just as quantum particles form the fundamental units of material complexity, genes are the fundamental units of living information. Although many questions about the emergence of life remain unanswered, in accordance with modern biology, the ToK posits that natural selection operating on genetic combinations through time is the unified theory of biology and forms the foundational understanding for the emergence of organic complexity.[15]

Mind

Mind/cognition in the ToK system refers to the set of mental behaviors. Mental behaviors are behaviors of animals mediated by the nervous system that produce a functional effect on the animal-environment relationship. As such, Mind/cognition is essentially synonymous with what behavioral psychologists have meant when they use the term behavior. Thus, a fly avoiding a fly swatter, a rat pushing a bar or a human getting a drink of water are all mental behaviors. Mind is not synonymous with sentience or the capacity for mental experience, although such processes are presumed to emerge in the mental/cognitive dimension. Cognition, in the broad sense of the term is meaning bodily-neuro-social information processing, as in EEEE Cognition: Embodied, Embedded, Enactive, Extended. While cognitive science stands for naturalist study of mind, psychology is an approach grounded in the tradition of humanities, especially philosophy. Thus, by defining mind as mental behavior, Henriques argues that the ToK System provides a way to bridge the epistemological differences between cognitive and behavioral science.[16]

Culture

Culture in the ToK system refers to the set of sociolinguistic behaviors, which range from large scale nation states to individual human justifications for particular actions. Just as genetic information processing is associated with the Life dimension and neuronal information processing associated with the Mind dimension, symbolic information processing emerges with the Cultural dimension.[17]

Theoretical joint points

Quantum gravity
Main article: Quantum gravity

Quantum gravity refers to the imagined merger between the twin pillars of physical science which are quantum mechanics, the study of the microscopic (e.g., electrons), and general relativity, the science of the macroscopic (e.g., galaxies). Currently, these two great domains of science cannot be effectively interwoven into a single, physical Theory of Everything. Yet progress is being made, most notably through string theory, loop quantum gravity, black hole thermodynamics and the study of the early universe. Some of the difficulties combining these two pillars of physical science are philosophical in nature and it is possible that the macro view of knowledge offered by the ToK may eventually aid in the construction of a coherent theory of quantum gravity. The reason the ToK might help is that it locates scientific knowledge in relationship to the physical universe.

The modern synthesis
Main article: The Modern Synthesis

The modern synthesis refers to the merger of genetics with natural selection which occurred in the 1930s and 1940s and offers a reasonably complete framework for understanding the emergence of biological complexity. Although there remain significant gaps in biological knowledge surrounding questions such as the origin of life and the emergence of sexual reproduction, the modern synthesis represents the most complete and well-substantiated joint point.

Behavioral investment theory

Behavioral investment theory (BIT) is proposed as a merger of the selection science of behaviorism with the information science of cognitive neuroscience (notice the parallel with the modern synthesis). BIT posits that the nervous system evolved as an increasingly flexible computational control system that coordinates the behavioral expenditure of energy of the animal as a whole. Expenditure of behavioral energy is theorized to be computed on an investment value system built evolutionarily through natural selection operating on genetic combinations and ontogenetically through behavioral selection operating on neural combinations. As such, the current behavioral investments of the animal are conceptualized as the joint product of the two vectors of phylogeny and ontogeny. A unique element of BIT is that it finds a core of agreement and builds bridges between five brain-behavior paradigms: (1) cognitive science; (2) behavioral science; (3) evolutionary theory and genetics; (4) neuroscience; and (5) cybernetics/systems theory.

David C. Geary noted the similarities between his "motive-to-control" hypothesis and Henriques' Behavioral Investment Theory, which were developed independently of each other. Furthermore, Geary suggested that his model "seem[ed] to fill in many of the proximate mechanisms and evolutionary pressures that define the life-mind joint point, and provided a framework for further development of the mind-culture joint point."[18]

Justification hypothesis

The justification hypothesis (JH) is a novel proposal that allows for both the understanding of the evolution of culture and for identifying what makes humans distinct animals. A basic initial claim of the JH is that the process of justification is a crucial component of human mental behavior at both the individual and societal level. Unlike all other animals, humans everywhere ask for and give explanations for their actions. Arguments, debates, moral dictates, rationalizations, and excuses all involve the process of explaining why one's claims, thoughts or actions are warranted. In virtually every form of social exchange, from warfare to politics to family struggles to science, humans are constantly justifying their behavioral investments to themselves and others.

The JH can be stated succinctly as follows: The evolution of language gave rise to the problem of justification, and this evolutionary pressure ultimately resulted in the human self-consciousness system and human culture. The JH carries with it three fundamental postulates.

  • The first is that the evolution of language must have created the problem of justification, which is the problem of explaining one’s self to others in a justifiable manner.
  • The second postulate is that the human self-consciousness system can be understood as a “justification filter”. This second claim links the evolutionary analysis with key insights from psychodynamic theory. Specifically, psychodynamic theory posits that socially unjustifiable impulses are inhibited and socially justifiable reasons are given for actions taken.
  • The third postulate is that culture can be understood as large scale justification systems that coordinate the behavior of human populations. Cultural systems are seen to evolve much in the same way as organisms do in biological evolution: there is a process of variation, selection and retention of belief systems.

How the ToK solves the problem of psychology

The problem of psychology, according to the ToK, is its conceptual incoherence, which Henriques identifies by the following:

(1) There is no agreed upon definition.
(2) There is no agreed upon subject matter.
(3) There is a proliferation of overlapping and redundant concepts.
(4) There are a large number of paradigms with fundamentally different epistemological assumptions.
(5) Specialization continues to be increasingly emphasized at the expense of generalization and thus the problem of fragmentation only grows.

When the various conceptions of psychology (e.g., behavioral, humanistic, cognitive) are viewed through the lens of the ToK System, psychology spans two different dimensions of complexity: the mental and the cultural. In other words, the discipline has historically spanned two fundamentally separate problems:

(1) the problem of animal behavior in general, and
(2) the problem of human behavior at the individual level.

If, as previously thought, nature simply consisted of levels of complexity, psychology would not be crisply defined in relationship to biology or the social sciences. And, indeed, it is frequently suggested that psychology exists in an amorphous space between biology and the social sciences. However, with its dimension of complexity depiction, the ToK System suggests that psychology can be crisply defined as the science of mind, which is the third dimension of complexity. Furthermore, because human behavior exists in the fourth dimension, psychology must be divided into two broad scientific domains of

(1) psychological formalism and
(2) human psychology.

Psychological formalism is defined as the science of mind and corresponds to the behavior of animal objects. Human psychology is considered to be a unique subset of psychological formalism that deals with human behavior at the level of the individual. Because human behavior is immersed in the larger socio-cultural context (level four in the ToK System), human psychology is considered a hybrid discipline that merges the pure science of psychology with the social sciences. It is important to point out that there are other disciplines the ToK System would classify as “hybrids.” Molecular genetics, for example, is a hybrid between chemistry and biology and neuroscience is a hybrid between biology and psychology. As with Henriques' proposed conception of human psychology, both of these disciplines adopt an object level perspective (molecular and cellular, respectively) on phenomena that simultaneously exist as part of meta-level system processes (life and mind, respectively).[19]

Though David A. F. Haaga "congratulate[d] Dr. Henriques' ambitious, scholarly, provocative paper", and "found the Tree of Knowledge taxonomy, the theoretical joint points, the evolutionary history, and the levels of emergent properties highly illuminating", he asks the rhetorical questions,

If it is so difficult to define terms such as 'psychology' with such precision, why bother? Why not just agree that we all have at least a rough idea of what psychology is, and take the rest of the afternoon off? After all, if theoretical or empirical work improves our understanding of some aspect of the world or our fellow people, or improves our ability to help people enhance their physical or emotional well being, what difference does it make whether this work is considered a part of psychology, of cognitive science, of behavioral neuroscience, of public health, or what have you? This raises the question of what definitions in general are good for.[20]

In a similar vein, Scott O. Lilienfeld, who described Henriques' effort as "thoughtful", contended that psychology is "an inherently fuzzy concept that resists precise definition" and that "attempts to define psychology [would be] likely to hamper rather than foster consilience across disciplines". Lilienfield went on further to suggest that the scientist-practitioner gap in psychology lies not in definitional issues, but in different "epistemic attitudes" between these two groups. He stated that scientists have an epistemic attitude of empiricism, (where questions regarding human nature are settled by scientific evidence), and that practitioners have an epistemic attitude of romanticism, (where questions of human nature are settled by intuition). Lilienfeld suggested that the solution to the scientist-practitioner gulf isn't definitional, but in "train[ing] future clinical scientists to appreciate the proper places of romanticism and empiricism within science".[21]

Consciousness and human behavior

A frequent question and point of confusion in the ToK System is the definition and meaning of consciousness. As mentioned above, mind is not synonymous with consciousness. And, to understand consciousness from a ToK vantage point, it is crucial to recognize that the term is often ambiguous in its meaning. Two primary meanings are sentience, which is the capacity for mental experience and self-awareness, which is the capacity to be aware of one's awareness. Sentience is conceptualized as a "level 3" phenomenon, possessed by many animals other than humans and is defined as a "perceived" electro-neuro-chemical representation of animal-environment relations. The ingredient of neurological behavior that allows for the emergence of mental experience is considered the "hard" problem of conscious and the ToK System does not address this question explicitly. In contrast, through the Justification Hypothesis (see below), the ToK System involves a very direct analysis of the other issue of consciousness, that of self-awareness.

Another frequent question that is raised is "Where does individual human behavior fall on the ToK?" To analyze human behavior from the context of the ToK, one uses the ToK like a prism to separate the dimensions of behavior into physiochemical, biogenetic, neuropsychological and sociolinguistic. Thus if we imagine a conversation between a husband and wife as follows:

Wife: “You are late again.”
Husband: “Please not now. It was a stressful day and traffic was bad and you know if work needs to be done, I can’t just leave it.”

The words represent the sociolinguistic dimension and are understood as a function of justification. Justification systems are seen both at the level of individual, micro-social and societal (i.e., the context of justification in which men work and women stay at home). The actions of the husband and wife in terms of facial expression, body movement, etc. are seen as the mental dimension and are understood as a function of behavioral investment. The physiological make up of the organ systems and cells of each body is seen as the biogenetic dimension. Finally, the position, temperature, molecular make up is seen as the physiochemical dimension. Each of the more basic dimensions represent conditions of possibility that allow for the emergence of the higher dimension of process. Thus, insufficient oxygen disrupts organic processes which in turn renders neuropsychological and sociolinguistic processes impossible.

Toward the integration of human knowledge

As stated above, the ToK System proposes a new epistemology with the goal of moving academic knowledge toward what E.O. Wilson termed consilience. Consilience is the interlocking of fact and theory into a coherent, holistic view of knowledge. Henriques argues that the ToK affords new perspectives on how knowledge is obtained because it depicts how science emerges from culture and that the four dimensions of complexity correspond to four broad classes of science: the physical, biological, psychological and social sciences.

Henriques further argues that developing such a system for integrating knowledge is not just an academic enterprise. He suggests that in an increasingly complex world, the fragmented state of knowledge can be seen as one of the most pressing social problems of our time. Henriques also believes that history seems to attest that the absence of a collective worldview ostensibly condemns humanity to an endless series of conflicts that inevitably stem from incompatible, partially correct, locally situated justification systems. Thus, from Henriques' perspective, there are good reasons for believing that if there was a shared, general background of explanation, humanity might be able to achieve much greater levels of harmonious relations.

In a 2008 article on the ToK,[22] Henriques cites Oliver Reiser's 1958 call for unifying scientific knowledge that Henriques implies is similar in theme to the ToK:

In this time of divisive tendencies within and between the nations, races, religions, sciences and humanities, synthesis must become the great magnet which orients us all…[Yet] scientists have not done what is possible toward integrating bodies of knowledge created by science into a unified interpretation of man, his place in nature, and his potentialities for creating the good society. Instead, they are entombing us in dark and meaningless catacombs of learning.[23]

With its depiction of the dimensions of complexity and interlocking theoretical joint points, Henriques' believes that his ToK System offers new avenues that might allow scholars to meet Reiser’s call for academic synthesis. Henriques, like Reiser, believes that with a shared sense of purpose and a common background of explanation, people might yet be able to integrate bodies of knowledge into a unified interpretation of humanity, with humanity's place in nature and its potentialities for creating the good society.

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See also

References
  1. "About Me" section of the ToK System website
  2. Henriques, G.R. (2003). The Tree of Knowledge System and the Theoretical Unification of Psychology. Review of General Psychology, 7, 150–182.
  3. Journal of Clinical Psychology. (December 2004). Special Issue: Defining Psychology: Articles and Commentaries on a New Unified Theory (Part 1) Issue Edited by Gregg R. Henriques. Volume 60 Issue 12, Pages 1203 – 1315
  4. Journal of Clinical Psychology. (January 2005). Special Issue: Defining Psychology: Articles and Commentaries on a New Unified Theory (Part 2) Issue Edited by Gregg R. Henriques. Volume 61 Issue 1, Pages 1 – 139
  5. Theory & Psychology. (December 2008). Volume 18, No. 6
  6. ToK FAQ
  7. Henriques, G.R. (2003). The tree of knowledge system and the theoretical unification of psychology. Review of General Psychology, 7, 150–182.
  8. Henriques, G.R. (2004). Psychology Defined. Journal of Clinical Psychology, 60, 1207–1221.
  9. Henriques, G.R. (2003). The tree of knowledge system and the theoretical unification of psychology. Review of General Psychology, 7, 150–182.
  10. Homepage of Michael Katzko
  11. Katzko, M.W. (2008). Pruning the Tree of Knowledge. Theory & Psychology, 18, 817–828. Abstract
  12. Wilson, E.O. (1999). Consilience: The Unity of Knowledge. Vintage:USA
  13. Henriques, G.R. (2008). The problem of psychology and the integration of human knowledge: Contrasting Wilson's Consilience with the ToK system. Theory & Psychology, 18, 731–755. Final draft
  14. Henriques, G.R. (2003). The Tree of Knowledge System and the Theoretical Unification of Psychology. Review of General Psychology, 7, 150–182.
  15. Henriques, G.R. (2003). The Tree of Knowledge System and the Theoretical Unification of Psychology. Review of General Psychology, 7, 150–182.
  16. Henriques, G.R. (2003). The Tree of Knowledge System and the Theoretical Unification of Psychology. Review of General Psychology, 7, 150–182.
  17. Henriques, G.R. (2003). The Tree of Knowledge System and the Theoretical Unification of Psychology. Review of General Psychology, 7, 150–182.
  18. Geary, D. C. (2005). The motivation to control and the origin of mind: Exploring the life-mind joint point in the tree of knowledge. Journal of Clinical Psychology, 61, 21–46.
  19. Henriques, G.R. (2004). Psychology Defined. Journal of Clinical Psychology, 60, 1207–1221.
  20. Haaga, D.A.F. (2004). Defining psychology: What can it do for us? Journal of Clinical Psychology, 60, 1227–1230.
  21. Lilienfeld, S.O. (2004). Defining psychology: Is it worth the trouble? Journal of Clinical Psychology, 60, 1249–1253.
  22. Henriques, G.R. (2008). The problem of psychology and the integration of human knowledge: Contrasting Wilson's Consilience with the Tree of Knowledge System. Theory & Psychology, 18, 731–755. Final draft
  23. Reiser, O.L. (1958). The integration of human knowledge. Boston: Porter Sargent.

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