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Lecture

AR1: Multisensory spatial interactions: a window onto functional integration in the human brain (Summarized)

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Department
Neuroscience
Course
NROC64H3
Professor
Niemier
Semester
Winter

Description
AR 1 Multisensory spatial interactions a window onto functional integration in the human brain ABSTRACT y Info from diff sensory modalitiesfirst process in separate brain regionso But since these diff signals can arise from COMMON eventsobjectsINTEGRATION o But integrationspatial and temporal constraints y This articlereview of o Neuroimaging data about SPATIAL aspects of MULTISENSORY INTEGRATION y Findings o Multisensory integration involvesConvergence from sensoryspecific into multisensory cortices ie from unimodal cortices into heteromodal brain areasINTRODUCTIONy Common neuro themeFUNCTIONAL SPECIALIZATION o Distinct cognitive sensory motor fxns localized in distinct brain regions o Functional neuroimaginguseful for exploringconfirming this theme o Ex identification of sensoryspecific areas responding to stimulation in one sensory modality BUT not another y Stimuli in DIFFERENT sensory modalities can still INTERACT under certain circumstancescertain perceptionbehavior o Ventriloquist effect o McGurk effect a seen lipmovement changes how a concurrent speechsound is hear o These effects can arisefrom INCONGRUENT multisensory congruence BUT theres also the effect of multisensory CONGRUENCE o MULTISENSORY CONGRUENCEVisual detection enhanced at the sound locationCrossmodal links in spatial attention y Signals in DIFFERENT MODALITIES from COMMON EXTERNAL SOURCEo often spatiallytemporally alignedmultisensory integration subject 2 corresponding spatialtemporal constraints y Neural basis of multisensory interactions studied via o Intracranial recordings animals o Noninvasive electrophysiological humans o Noninvasive hemodynamic humans y Animal study focus o Multisensory interactions that arise due to CONVERGING FEEDFORWARD projections from sensoryspecific to heteromodal brain regions o Neurons of hetermodal regions respond to stimuli in more than one modalityallow multisensory interactions at singlecell level
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