AUDITORY CORTEX• Determination of direction of entry of sound: • Time lag between entry of sound into one ear and the other • Difference between the intensities of the sounds in the two ears.• Neural mechanism:• Superior olivary nucleus
OLFACTORY CORTEX• Very old – Medial olfactory area • Hypothalamus & limbic cortex• Less old olfactory area • Limbic cortex & Paleocortex• Newer pathway • Dorsomedial thalamic nucleus • Lateropasterior quadrant of the orbitofrontale cortex
ASSOCIATION AREAS• Parietooccipitotemporal association area: • Spatial co-ordinates • Language comprehension (Wernicke’s area) • Visual comprehension (Angulate gyrus - Dyslexia) • Naming objects• Prefrontal association area: • Sequential and parallel inputs of motor function • Planning of motor activity (thought process) • Working memory
WERNICKE’S AREA:• = GENERAL INTERPRETIVE AREA• = GNOSTIC AREA• = KNOWING AREA• = TERITARY ASSOCIATION AREA• Single greatest role of any part of the cerebral cortex for the function of intelligence.• Highly developed on the dominant hemisphere in the posterior part of the superior temporal lobe.
ANGULAR GYRUS• Most inferior portion of posterior parietal lobe.• Visual comprehension• Dyslexia
FACE RECOGNITION• Medial undersides of both occipital lobes• Prosophenosia
NON DOMINANT HEMISPHERE• Interpretation of music• Nonverbal visual experiences (patterns)• Spatial relationships between person and environment• Body language, intonation of voices• Somatic experiences from limbs and hands
Gerstmann syndrome• Lesion at angular and supramarginal gyri near parietotemporal junction• Dysgraphia• Dyscalculia• Finger agnosia• Left right disorientation