English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Correlates of visual learning in area V4

Rainer, G., & Logothetis, N. (2002). Correlates of visual learning in area V4. Poster presented at 5. Tübinger Wahrnehmungskonferenz (TWK 2002), Tübingen, Germany.

Item is

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Rainer, G1, 2, Author              
Logothetis, NK1, 2, Author              
Affiliations:
1Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, Spemannstrasse 38, 72076 Tübingen, DE, ou_1497794              

Content

show
hide
Free keywords: -
 Abstract: We trained monkeys to identify objects in the presence of varying amounts of visual noise in a delayed-matching-to-sample paradigm. Monkeys were presented with a brief cue object, which could be either a novel or familiar object at one of several stimulus levels ranging from 0 (visual noise) to 100 (undegraded object). After a brief delay, an undegraded probe object was presented and monkeys had to release a lever if the sample matched this test object. We used colored images of natural scenes, faces, etc. presented at the center of gaze. Experience with a particular set of objects allowed monkeys to identify them in the presence of greater amounts of noise compared to novel objects. We have previously shown that object-selective neurons in macaque prefrontal cortex reflect this behavioral improvement (RainerMiller, Neuron 27:179-189, 2000). By recording the activity of single neurons from eight electrodes simultaneously placed in parafoveal extrastriate area V4, we aim to describe the role of these neurons in communicating information about degraded objects, and examine if and how this information is modified by visual learning. We have preliminary data from 83 neurons from one monkey. Many neurons reliably communicated information about both novel and familiar degraded objects. At intermediate stimulus levels, these neurons signalled more information about familiar than about novel objects, consistent with a possible involvement in the behavioral improvements. In addition, we observed a tendency for undegraded familiar objects to elicit more activity than novel objects early on in the visual response. These findings suggest that visual experience can modify the properties of neurons in extrastriate area V4, and that learning already begins to affect neurons relatively early in the visual processing hierarchy.

Details

show
hide
Language(s):
 Dates: 2002-02
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: BibTex Citekey: 954
 Degree: -

Event

show
hide
Title: 5. Tübinger Wahrnehmungskonferenz (TWK 2002)
Place of Event: Tübingen, Germany
Start-/End Date: 2002-02-22 - 2002-02-24

Legal Case

show

Project information

show

Source 1

show
hide
Title: TWK 2002: Beiträge zur 5. Tübinger Wahrnehmungskonferenz
Source Genre: Proceedings
 Creator(s):
Bülthoff, HH1, Editor            
Gegenfurtner, KR, Editor            
Mallot, HA, Editor            
Ulrich, R, Editor
Affiliations:
1 Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794            
Publ. Info: Kirchentellinsfurt, Germany : Knirsch
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 97 Identifier: ISBN: 3-927091-56-1