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DTSTAMP:20260404T145357Z
UID:62712198ba2bf221366875@ist.ac.at
DTSTART:20220516T100000
DTEND:20220516T110000
DESCRIPTION:Speaker: Olivier Marre\nhosted by Gasper Tkacik\nAbstract: Reti
 na ganglion cells extract specific features from natural scenes and send t
 his information to the brain. In particular\, they respond to local light 
 increase (ON responses)\, and/or decrease (OFF). However\, it is unclear i
 f this ON-OFF selectivity\, characterized with synthetic stimuli\, is main
 tained when they are stimulated with natural scenes. Here we recorded the 
 responses of ganglion cells of mice and axolotls to stimuli composed of na
 tural images slightly perturbed by patterns of random noise to determine t
 heir selectivity during natural stimulation. The ON-OFF selectivity strong
 ly depended on the natural image. A single ganglion cell can signal lumina
 nce increase for one natural image\, and luminance decrease for another. M
 odeling and experiments showed that this was due to the non-linear combina
 tion of different pathways of the retinal circuit. Despite the versatility
  of the ON-OFF selectivity\, a systematic analysis demonstrated that contr
 ast was reliably encoded in these responses. Our perturbative approach thu
 s uncovers the selectivity of retinal ganglion cells to more complex featu
 res than initially thought during natural scene stimulation.
LOCATION:Mondi Seminar Room 3\, Central Building\, ISTA
ORGANIZER:abonvent@ist.ac.at
SUMMARY:Olivier Marre: Context-dependent selectivity to natural scenes in t
 he retina
URL:https://talks-calendar.ista.ac.at/events/3759
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