English
 
Help Privacy Policy Disclaimer
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Non-monotonic noise tuning of the BOLD signal to natural images in monkey primary visual cortex

Rainer, G. (2002). Non-monotonic noise tuning of the BOLD signal to natural images in monkey primary visual cortex. In Third Annual Computational Neuroscience Symposium 2002: Visual Processing of Natural Images (pp. 22).

Item is

Basic

show hide
Genre: Meeting Abstract

Files

show Files

Creators

show
hide
 Creators:
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: The perceptual ability of humans and monkeys to identify natural images declines monotonically as noise is added to the Fourier phase spectrum of the images. Unlike behavioural performance, blood-oxygenation-level-dependent (BOLD) signal levels in the primary visual cortex (V1) of the anesthetized monkey were non-monotonic. The BOLD response had a V-shaped tuning function with local maxima for nondegraded natural images and pure noise patterns (random phase with natural amplitude spectrum), and a minimum for intermediate images with Fourier phase interpolated between natural and random phase. I will describe a simple model, which suggests that the V-shaped tuning function may be a result of a trade-off between the number of responsive V1 neurons and the strength of the response. In addition, BOLD activity in extrastriate cortex will be compared with single unit data recorded in awake monkeys using the same stimuli. Together, these studies aim to shed light on the representation of natural images in visual cortical areas and to advance our understanding of the relation between single unit activity and BOLD signal levels for complex natural inputs.

Details

show
hide
Language(s):
 Dates: 2002-04
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: -
 Degree: -

Event

show
hide
Title: Third Annual Computational Neuroscience Symposium 2002: Visual Processing of Natural Images
Place of Event: Minneapolis, MN, USA
Start-/End Date: 2002-04-05 - 2002-04-06

Legal Case

show

Project information

show

Source 1

show
hide
Title: Third Annual Computational Neuroscience Symposium 2002: Visual Processing of Natural Images
Source Genre: Proceedings
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 22 Identifier: -