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SUMMARY:Neural adaptation in the auditory system: competing demands for ob
 ject recognition and localization
DTSTART:20110325T111500
DTSTAMP:20260414T234945Z
UID:d584ed14d4057cce1af6e9f9177521536cbae94bae9d0f5410dc18e4
CATEGORIES:Conferences - Seminars
DESCRIPTION:Jannis HILDEBRANDT\nBecause the coding range of sensory system
 s is restricted\, they have to adapt to changes of the statistics of the r
 elevant stimulus space. Sensory adaptation can ensure precise encoding of 
 the environment over several orders of magnitude of mean intensity. By rem
 oving the mean intensity level\, adaptation enables object recognition inv
 ariant of the local context. Thus\, adaptation removes information from th
 e sensory representation\, for example the mean intensity. However\, senso
 ry systems have to represent different features of a stimulus in parallel\
 , and the information that is important for detection of these may differ.
  Consequently\, adaptation should act differently in different parts of th
 e pathway.\n\nIn the auditory pathway of both invertebrates and vertebrate
 s\, the time course of amplitude modulations is used for object recognitio
 n\, while the absolute amplitude difference between both ears plays an imp
 ortant role in sound localisation. I will present results from both analyt
 ical calculations and numeric simulations\, which show that these two task
  pose different demands on adaptation in the sensory periphery. However\, 
 modeling also suggested a possible solution to this conflict. Experimental
  results from the grasshoppers auditory system revealed the neural substra
 te for the solution and behavioral experiments confirmed model predictions
 . The mammalian auditory pathway exhibits similar neural mechanisms\, sugg
 esting a convergent solution to a common problem. 
LOCATION:BC 01 https://plan.epfl.ch/?room==BC%2001
STATUS:CONFIRMED
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