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SUMMARY:BMI SEMINAR // Marion Silies - Mechanisms to accurately estimate t
 he salience of visual stimuli
DTSTART:20191204T121500
DTEND:20191204T131500
DTSTAMP:20260427T215024Z
UID:110b73544d02015627f63d15bd9d93e1ade10b631a3995a189b219ea
CATEGORIES:Conferences - Seminars
DESCRIPTION:Marion Silies\, Johannes-Gutenberg-Universität Mainz\, Instit
 ute for Development and Neurobiology (iDN)\, Mainz\, Germany\n\nIn many co
 ntexts\, changes in perception are proportional to relative changes in the
  stimulus\, rather than its absolute value\, as formulated by Weber’s la
 w. Visual perception for example scales with changes in the visual stimulu
 s\, or contrast\, irrespective of background illumination. However\, visua
 l perception is challenged when adaptation is not fast enough to deal with
  sudden declines in overall illumination\, e.g. when gaze follows a moving
  object from bright sunlight into a shaded area. Here\, we show that the v
 isual system of the fly employs a solution by propagating a corrective lum
 inance-sensitive signal to higher processing stages. We use in vivo 2-phot
 on imaging and behavioral analyses to show that distinct OFF-pathway input
 s encode contrast and luminance. Predictions of contrast-sensitive neurona
 l responses show that contrast information alone cannot explain behavioral
  responses in sudden dim light. The luminance-sensitive pathway is require
 d for processing visual motion in such conditions\, i.e. when pure contras
 t sensitivity underestimates the salience of a stimulus. Thus\, retaining 
 a peripheral feature\, luminance\, in higher visual processing is required
  for robust behavioral responses. Given the many similarities in visual pr
 ocessing properties between invertebrates and vertebrates\, this likely pr
 esents a general processing strategy of all visual systems.\n 
LOCATION:SV 1717 https://plan.epfl.ch/?room==SV%201717
STATUS:CONFIRMED
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