Gotts, Steve Frontal Cortex Priming
<p>Mar 23, 2009 10:54 PM
 
STEVE GOTTS  now at NIMH.
 
Gave a talk on March 25 in MBC  with  Jay McClelland on 
 
Tuining Curves for Object Concpts in Human Brain.
 
Steve was a student of Dave Plaut  at  CMU ... did a lot on repetition priming.
 
Now at Brain and Cognition Lab  works with Bob Desemone   collab with Alex Martin
 
 
they ID'd  thousands of meaningful objects  eg   COW HORSE HAMMER
 
use   fMRI  adaptation  (ie  decr response)
 
present objects at one per second  (for perhaps an hour or so).
 
present   five objects  (the ANCHOR)   a1  to a5  then  a deviant   (eg  face of a COW instead of the body)
then a landscape then the   response object   (eg a hammer)
 
used 7 subjects....   their instruction  "how similar are these objects.
 
similarity   decreases exactly as you'd expect   from  cow   thru horse  to lobster eg.
 
look at  adaptation and recovery from adaptation
 
get a parallelogram  where  image selection  (ie similarity by raw image is similar on top)  vs
category  selective on bottom    (similarity by concept)
 
ie  pereceptual  is closer to the IMAGE   whereas  Conceptual is closer to category.
 
raw beta weights;  repetition supression
 
conceptual broadening vs sharpening categories.
 
 
 
 
 
 
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