1-23-MeasuringBrainFunction

1-23-MeasuringBrainFunction - Measuring Brain Function...

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1 Measuring Brain Function Organization of the Brain • Major Structures of the Brain Functional Organization of the Cortex • Lateralization of Function Functional Organization of Cortex In general, the cerebral cortex has a contralateral organization Contralateral = “opposite side” Each hemisphere is “in charge” of the opposite side of the body E.g., the right hemisphere controls left arm and receives sensory information from the left side of space and left side of the body Left Right
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2 • Each lobe of cerebral cortex contains primary areas and association areas Types of Primary Areas: Primary sensory areas : cortical regions that receive sensory input Primary visual area Primary somatosensory area Primary auditory area Primary motor area: cortical region where motor information departs the cortex and is sent to the musculature Association Areas – Represent complex combinations of sensory information and are involved in higher mental functions Cortical Organization Primary Areas Primary Areas Exhibit: Topographic Organization • Primary areas are systematically organized such that the layout of neural representations in the cortex is directly related to the layout of the sensory organ (or musculature) Cortical Magnification • A greater proportion of primary areas is devoted to the representation of things for which we are more sensitive. – Ex: a greater proportion of the primary somatosensory area is devoted to representing our fingers than our toes Occipital Lobe • Vision! • Each hemisphere receives visual information from contralateral visual space • Primary visual area has retinotopic organization – Adjacent regions of the retina are represented in adjacent areas of primary visual area
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3 Retinotopic Organization Temporal Lobe • The temporal lobe is involved in both visual and auditory processing Primary auditory area – Receives auditory information from contralateral ear (mostly) Tonotopic organization: similar frequencies represented in adjacent regions of cortex • Association areas in temporal lobe are involved in complex visual perception (pattern recognition, face perception) Tonotopic Organization
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4 Parietal Lobe • Parietal lobe is involved in somatosensation (touch) as well as spatial aspects of perception • Association areas in parietal lobe are involved in spatial aspects of vision and perception of spatial information Parietal Lobe Primary somatosensory area receives somatosensory
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1-23-MeasuringBrainFunction - Measuring Brain Function...

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