Hemispheric differences in auditory perception are similar to those found invisual perception

Article Abstract:

The computational difference and perceptional assymetry of the cerebral hemispheres in response to auditory stimuli were examined using pitch discrimination. Discrimination of high and low frequency sound was analyzed to assess the laterality effect. Results indicated that the right ear showed more accuracy in judging high frequency sounds and the left ear fared better in low frequency stimuli. This effect complied with a similar test for vision. A postsensory mechanism for the laterality effect was implied which proved the computational difference between the cerebral hemispheres.

Testing, Cerebral dominance, Pitch discrimination

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Dissociation of spatial and temporal coupling in the bimanual movements of callosotomy patients

Article Abstract:

Callosal connections constitute the neural mechanism that regulates movements in response to spatial demands. However, corpus callosum has little influence on temporal synchrony in movement. A study testing callosotomy patients for bimanual movements reveals that the patients fail to deviate in the trajectories in response to different spatial demands for the two hands. However, the temporal synchrony is unaffected in these patients. Unlike normal subjects, they fail to show any increase in planning and execution time for movements with the different spatial demands.

Analysis, Movement (Physiology), Extremities (Anatomy), Human mechanics, Corpus callosum

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Two issues in auditory cognition: self-organization of octave categories and pitch-invariant pattern recognition

Article Abstract:

The general principles of neural self-organization network operating on the cochlear spectral representations produce octave categories. The auditory and musical cognition are similar to visual cognition. Although stimuli are different for different types of cognition, self organization occurs on similar lines. Invariant pattern recognition is the identification of constant frequency patterns changed to various absolute frequencies. A model to map tones into a pitch invariant format is presented.

Cognition, Pattern perception (Psychology), Form perception (Psychology)

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