The cerebral hemispheres and bilateral neural nets.
A high-level cognitive dichotomy ("language and context") is reviewed in relation to empirical findings concerning the functions of the human cerebral hemispheres. We argue that the right hemisphere's involvement in the generation of connotative and contextual information in parallel with the denotative and literal language functions of the left hemisphere provides an important insight into the organization of viable cognitive systems. The role of the corpus callosum in producing the dichotomy is discussed. Finally, the generation of asymmetrical activity in structurally symmetrical, bilateral neural nets is described. The model demonstrates how complementary memory states can be generated in bilateral nets without assuming different modes of information processing, provided that the nets have inhibitory, homotopic connections. Unlike excitatory connections, inhibitory connections are sufficient to generate asymmetric hemispheric activity without postulating intrinsic differences between the cerebral hemispheres.
Cook
N D
ND
Neuropsychology Unit, Neurology Clinic, University Hospital, Zurich, Switzerland.
Beech
A R
AR
D001921:Brain / Q000502:physiology*; D003071:Cognition / Q000502:physiology; D003337:Corpus Callosum / Q000502:physiology; D007839:Functional Laterality / Q000502:physiology*; D006801:Humans; D007802:Language; D009420:Nervous System / Q000166:cytology; D009424:Nervous System Physiological Phenomena