NROC64H3 Lecture Notes - Lecture 6: Occipital Lobe, Multisensory Integration, Unimodality
17 Mar 2012
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B/c signals from different sensory modalities can arise from common events, integration is useful. Synergy: the whole is greater than sum of its parts. Specialized brain areas but powerful cross-modal illusions. Solution 1: feed-forward to later, multisensory/heteromodal areas. Solution 2: lateral connection b/w unimodal areas. Explanation: continuum of bah-dah-gah; categorical perception of speech sounds. Auditory stimulus = bah, visual stimulus = gah, va = dah. Illusion by linear acceleration/deceleration, giving feeling of false climb descent. Caused by pilot"s misinterpreting the information from otolith organs. Rubber hand illusion: false sense of rubber hand is part of body = recaliberation of body schema. Multisensory neurons respond to stimuli form more than single sense. Most sc neurons have multiple excitatory rfs. Superadditive: spatial congruency/same direction; spatial incongruency: inhibition. Sc neurons and cortical neurons aren"t multisensory at birth or lack multisensory enhancement. Inverse effectiveness: multisensory enhancement is typically inversely related to the effectiveness of individual cues that are being combined.
