PrimateBrains

PrimateBrains - CS 143 * Animal Cognition Lecture 3:...

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CS 143 * Animal Cognition Lecture 3: PRIMATE BRAINS See Neuroscience Review on Course Website Primate Brains are larger than other mammals of similar size, Cortex (esp visua l) particularly well developed - See next lecture for discussion of brain size comparisons Sensory Motor Integration - Somatosensory Pathways : S1 along Post-Central Gyrus of Parietal Lobe - “Penfield Map ” there shows face, hands magnified (indicates greatest innervation, highest acuity ) - Contributes to high level Viso-Spatial Maps in Parietal Lobe, for localizing in immed and distant env - Auditory Pathways : Air vibrations pass into Inner Ear ( Cochlea ), stimulate receptor neurons there - Several Hind & Midbrain (incl. Inf Colliculus ) synapses, combine from 2 ears ( binaural ) to localize - In Primates, Inferior Colliculus is smaller than Superior Colliculus for vision - MGN of Thalamus and A1 in Temporal Cortex have Frequency/amplitude maps; - Hearing range: 0.2-20kHz ; Can make fine discriminations between tones up to ~4kHz - Higher Auditory Cortex : - Info on identity of call/caller in anterior (rostral) Sulcus, adjacent to A1; Connects esp to Frontal lobe - Info on location of call in posterior (caudal) Sulcus (also "higher" aud cortex), connecting esp to Parietal - Auditory system very like typical mammal, less specialized or complex than vision and somatosensory are - Altho see notes on Human specializations (language) in “Lateralization” section below - Visual Pathways Vision = principal sensory system ; - Fewer Hindbrain synapses than Audition; Evolved later, most prominent in Cortex - LGN of Thalamus and V1 & V2 of Occipital Cortex map Retinal surface - Crossover : Right Visual Field , falls on Left Half of both Retinas, processed by Left Brain ) - e.g. Left Tectum ( Superior Colliculus ) maps only right visual field, Right maps only left - Unlike in many mammals in whom redundant Tectum maps include both fields - Aids Primate orienting to center of field , e.g. for aiming reach or jump - Ventral Pathway = “ What ” Path, Occipital to Temporal Cortex, for identifying
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This note was uploaded on 09/15/2011 for the course COGS 143 taught by Professor Johnson during the Spring '08 term at UCSD.

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PrimateBrains - CS 143 * Animal Cognition Lecture 3:...

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