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SUMMARY:The Effects of Attention and Visual Input on the Representation of
  Natural Speech in EEG - Dr Ed Lalor\, Trinity College Dublin 
DTSTART:20130625T110000Z
DTEND:20130625T120000Z
UID:TALK45999@talks.cam.ac.uk
CONTACT:33569
DESCRIPTION:Traditionally\, the use of electroencephalography (EEG) to stu
 dy the neural processing of natural stimuli in humans has been hampered by
  the need to repeatedly present discrete stimuli. Progress has been made r
 ecently by the realization that cortical population activity tracks the am
 plitude envelope of speech stimuli. This has led to studies using linear r
 egression methods which allow the presentation of continuous  speech. One 
 such method\, known as stimulus  reconstruction\, has so far only been uti
 lized in multi-electrode cortical surface recordings and magneto-encephalo
 graphy (MEG). In this talk I will present data from two studies showing th
 at such an approach is also possible with EEG. In the first study\, I will
  present data showing that it is possible to decode attention in a natural
 istic cocktail party scenario on a single trial (≈60 s) basis. In the se
 cond\, I will present results showing that the representation of the envel
 ope of  auditory speech in the cortex is earlier and more robust when acco
 mpanied by visual speech. The sensitivity of the stimulus reconstruction a
 pproach has implications for the design of future EEG studies into the ong
 oing dynamics of cognition and for research aimed at identifying biomarker
 s of clinical disorders.
LOCATION:Department of Psychology\, Kenneth Craik Seminar Room\, Craik Mar
 shall Building\, Downing Site
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