Pribrams Holographic Model

Pribram's holonomic brain theory = holographic brain theory. The Austrian-born American physician and neuropsychologist Karl Harry Pribram (1919- ) developed a holographic model of memory ("holographic memory") constituting a hypothetical concept of the neurophysiological aspects of memory that resemble a hologram having a three-dimensional feature. In photography, the term holography refers to a method of producing three-dimensional images by using light wave interference patterns, and has been suggested by Pribram as an explanation for the process whereby images may be formed in the mind. The term hologram refers to the film used in holography, and is constructed typically by photographically recording wave-fronts of laser light reflected from actual objects. The map of the neurological pathways in the human brain is complex and interactions occur at many levels. Pribram's model suggests that the map be viewed not as a representation in Euclidian geometry but as Rimanian, viewing a scene in three dimensions rather than two in order to understand the variety of frames of reference when they interact. Concerning the brain's memory storage, the deep structure for this capacity is distributed over some extent within each brain system and is composed of "patches" within the synaptodendritic processing web - patches that are organized by experience. Thus, propositional, categorical, object, allo-, and ego-centric frames access the deep store somewhat like a computer program addresses the memory store in a computer. How-ever, in the brain the process seems to be content oriented rather than location oriented. Pribram asserts that a neural holographic process does not imply that input information is distributed randomly over the entire depth and surface of the brain, but only those limited regions where reasonably stable junctional designs are initiated by the input participate in the distribution. According to Pribram, the capability to directly "address" content with out reference to location, so readily accomplished by the holographic process, eliminates the need for keeping track of where information is stored. Thus, Pribram's holographic model involves "content-addressable" holographic-like matching between current input and stored memory, where the model is based on evidence obtained with microelectrode recordings made within the brain's hippocam-pal system and within the somatosensory cortex of the parietal lobe. In effect, Pribram's model is a holographic process that is based on the distribution of, and enfolding of, information over and within an "extent" (i.e., a spatial and temporal envelope) that is structurally and functionally similar to the "marketplace" in economics. For example, an economic marketplace may be viewed as a holographic structure in which each transaction enfolds the values of the whole, which are distributed throughout the extent of the whole. Thus, when one spends a unit of currency, say a dollar, the current value of that unit/currency represents the productivity of some nation, the adjustments of nations to a common market and common currency, the status of stock markets, etc. In the same way, in Pribram's approach, the current valuation of an event occurs within the "marketplace" of the episode within which the event is generated, and valuation depends on the values attributed to the variety of transactions that compose the episode. See also MEMORY, THEORIES OF; TOTE MODEL/HYPOTHESIS. REFERENCES

Pribram, K. H. (1960). A review of theory in physiological psychology. Annual Review of Psychology, 11, 1-40. Pribram, K. H. (1971/1977/1982). Languages of the brain: Experimental paradoxes and principles in neuropsychology. Englewood Cliffs, NJ: Prentice-Hall. Pribram, K. H. (1975/1985). The hippocampus. 4 vols. New York: Plenum. Pribram, K. H. (1991). Brain and perception: Holonomy and structure in figural processing. Hillsdale, NJ: Erlbaum. Pribram, K. H. (1998/2003). The holographic brain (video). Karl Pribram (#5490). Berkeley, CA: Thinking Allowed Productions.




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