English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Visual discrimination strategies of monkey and human observers for simple geometric shapes

Nielsen, K., Logothetis, N., & Rainer, G. (2003). Visual discrimination strategies of monkey and human observers for simple geometric shapes. Poster presented at 6. Tübinger Wahrnehmungskonferenz (TWK 2003), Tübingen, Germany.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-DD2C-D Version Permalink: http://hdl.handle.net/21.11116/0000-0005-7B77-C
Genre: Poster

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Nielsen, K1, 2, Author              
Logothetis, NK1, 2, Author              
Rainer, G1, 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: During visually guided behavior relevant information must be extracted from the objects in the environment. Which information about particular stimuli is actually used can provide insights into strategies underlying behavior. Here we quantify which parts of simple geometric shapes humans and monkey observers used during a visual discrimination task. The stimulus set consisted of three rotated versions of a square with a single protrusion (left, up or right). Each shape was associated with a unique behavioral response (button press or eye movement). We determined relevant regions in each stimulus by presenting the shapes behind occluding surfaces with randomly placed windows, while the observers continued to perform the discrimination task. In this paradigm, the diagnostic value of a shape region is reflected in the way in which its occlusion affects the performance of the observer. While occlusion of an unimportant shape feature will leave discrimination performance unaffected, occlusion of the diagnostic features will render the observer unable to identify the shape correctly. For the human observers, each pattern had one diagnostic region consisting of the protrusion. Similar results were obtained in a monkey subject for two of the three shapes. Interestingly, no region was identifiable for the third shape, even though the monkey could identify the shape with about the same accuracy as the other two shapes. We suggest that the lack of a diagnostic region for the third shape reflects the strategy of the monkey, who tended to choose the third shape whenever neither of the protrusions corresponding to the first two shapes was visible. We conclude that although there was close agreement for the majority of stimuli, we also found strategy differences between human and monkey observers.

Details

show
hide
Language(s):
 Dates: 2003-02
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: BibTex Citekey: 2565
 Degree: -

Event

show
hide
Title: 6. Tübinger Wahrnehmungskonferenz (TWK 2003)
Place of Event: Tübingen, Germany
Start-/End Date: 2003-02-21 - 2003-02-23

Legal Case

show

Project information

show

Source 1

show
hide
Title: 6. Tübinger Wahrnehmungskonferenz: Sixth Perception Conference at Tübingen, TWK 2003
Source Genre: Proceedings
 Creator(s):
Bülthoff, HH1, Editor            
Gegenfurtner, KR, Editor            
Mallot, HA, Editor            
Ulrich, R, Editor
Wichmann, FA1, 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: 159 Identifier: ISBN: 3-927091-62-6