[Dual organization of sensorimotor activity].
An anatomical symmetry of the bilateral organism and the functional assignment of brain hemispheres each to one side of the body are preconditions for sensorimotor brain localization. The invariant system elements necessary for this consist of "modules". These are associations of about 2 500 cortical cells in each case. When we refer to duality, we do not mean dualistically separated, but mutually assigned or mutually coordinated half-systems. The mainly decussated sensory and nervous systems of the vertebrates probably give rise to their rhythmic gait coordinated in relation to the axis of the body. Compared to such vital movements, human motor activity varies between voluntary action and involuntary expression. Cortical projection duplicates in the form of secondary or supplementary sensorimotor areas are ascribed hypothetically to an identifiable somatosensory sensation. A development leading to man is likely to have commenced as the brain halves of a pithecanthropus gained asymmetric degrees of freedom in relation to their somatotopic binding to the body. This phylogenetic differentiation led to a dual disjunction of the cerebral hemispheres which enabled a side-different "either/or" in human actions. Speech and thought as transitive order forms are also based on functional asymmetries of the human cerebrum.
D002540:Cerebral Cortex / Q000502:physiology; D007839:Functional Laterality; D005684:Gait; D006801:Humans; D009039:Motion Perception; D011597:Psychomotor Performance; D013060:Speech; D013850:Thinking
Uber duale Organisation der Sensomotorik.