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SUMMARY:Adaptation Produces Change-Salience - Professor M. J. Morgan\, Cit
 y\, University of London
DTSTART:20190213T130000Z
DTEND:20190213T140000Z
UID:TALK116332@talks.cam.ac.uk
CONTACT:John Mollon
DESCRIPTION:Studies of ‘change blindness’ have shown that motion detec
 tion is vulnerable to interruption by blinks\, resulting in very poor chan
 ge detection.  Here we describe a form of change detection that functions 
 with staring eyes and is not vulnerable to blinks. ‘Change-blindness’ 
 is replaced by ‘Change salience’ when eye movements are measured and c
 ontrolled so that the pre-change and changed stimuli fall on the same reti
 nal locations. ‘Change salience’ is abolished by eye movements\, and i
 t is strongly asymmetrical: a singleton changed object is much easier to d
 etect than an object that is the only stimulus in the image not to change.
  The asymmetry in ‘Change salience’ is not attributable to a reduction
  in the amplitude (contrast) of stimuli by adaptation because\, paradoxica
 lly\, a reduction in actual amplitude   of the target increases\, rather t
 han decreases\, target detectability. We conclude that the visual system h
 as a specific mechanism for change detection in a stationary scene\, based
  on the automatic attraction of attention by the transient increase in fir
 ing of detectors than have not recently been stimulated.  These findings s
 uggest a new functional role for low-level sensory adaptation\, which has 
 hitherto proved elusive.
LOCATION:Kenneth Craik Room\, Craik-Marshall Building\, Downing Site
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