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DTSTART:20170326T030000
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DTSTART:20161030T020000
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DTSTAMP:20260428T233020Z
UID:58adb3e4d1fd3838581779@ist.ac.at
DTSTART:20170306T130000
DTEND:20170306T140000
DESCRIPTION:Speaker: Norma Kühn\nhosted by Maximilian Jösch\nAbstract: In
  many species\, direction-selective (DS) retinal ganglion cells strongly r
 espond to motion into a certain (preferred) direction but are suppressed b
 y motion into the opposite (null) direction. A subset of these cells is th
 ought to report the motion direction of global image motion\, as induced b
 y body\, head and eye movements\, to downstream brain areas. The readout o
 f motion direction from DS cell responses has usually been tested with con
 tinuously drifting gratings but seldom with naturalistic motion stimuli wh
 ere direction and velocity change constantly. We performed multi-electrode
  array recordings on the in-vitro salamander retina where we could record 
 the signals from up to 25 DS cells simultaneously and projected moving tex
 tures following a complex trajectory onto the retina. We observed that DS 
 cells also responded in a direction-selective fashion to complex texture m
 otion and that their preferred directions were preserved. Nevertheless\, t
 he readout of motion signals from individual DS cells is ambiguous due to 
 the cells' simultaneous encoding of local contrast changes. These ambiguit
 ies can be resolved by a population code of DS cells with different prefer
 red directions\, leading to a synergistic trajectory readout\, i.e.\, the 
 population code provided more information about the motion trajectory than
  would be expected from the sum of individual DS cell contributions. Stron
 g positive response correlations between cells enhanced this synergy. This
  may serve as an example where population codes synergistically improve th
 e extraction of single features from neurons encoding multiple features si
 multaneously when stimulated with complex visual scenes.\n
LOCATION:Meeting room 1st floor  / Lab Bldg East (I06.01.406)\, ISTA
ORGANIZER:rsix@ist.ac.at
SUMMARY:Norma Kühn: Decoding complex texture motion from populations of di
 rection-selective retinal ganglion cells
URL:https://talks-calendar.ista.ac.at/events/337
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