NROC64H3 Lecture Notes - Lecture 6: Occipital Lobe, Multisensory Integration, Unimodality

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17 Mar 2012
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NROC64H3S Sensory and Motor Systems
Lecture 6 02.17.12
Introduction
- 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
- How do our senses work together?
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
Multisensory Illusions
- The McGurk Effect
Audio-visual illusion
Explanation: Continuum of bah-dah-gah; categorical
perception of speech sounds
Auditory stimulus = bah, visual stimulus = gah, VA =
dah
- Oculogravis Illusion
Illusion by linear acceleration/deceleration,
giving feeling of false climb descent
Caused by pilots misinterpreting the information
from otolith organs
- Rubber Hand Illusion: False sense of rubber hand is
part of body = Recaliberation of body schema
Multisensory Neurons in the SC
- 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
Makes sense statistically?
Eye movements shift nonvisual RFs
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