JN AJP: Endocrinology and Metabolism
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
QUICK SEARCH:   [advanced]


     

J Neurophysiol (September 28, 2005). doi:10.1152/jn.00871.2005
This Article
Right arrow Full Text (PDF)
Right arrow All Versions of this Article:
95/1/271    most recent
00871.2005v1
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Crowder, N. A.
Right arrow Articles by Ibbotson, M. R.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Crowder, N. A.
Right arrow Articles by Ibbotson, M. R.
Submitted on August 18, 2005
Accepted on September 25, 2005

Relationship between contrast adaptation and orientation tuning in V1 and V2 of cat visual cortex

Nathan A. Crowder1, Nicholas S. Price1, Markus A. Hietanen1, Bogdan Dreher2, Colin W. G. Clifford3, and Michael R. Ibbotson1*

1 Visual Sciences, Research School of Biological Sciences, Australian National University, Canberra, ACT, Australia
2 Department of Anatomy and Histology, School of Medical Sciences and Institute for Biomedical Research, University of Sydney, Sydney, NSW, Australia; Visual Sciences, Research School of Biological Sciences, Australian National University, Canberra, ACT, Australia
3 Visual Perception Unit, School of Psychology, University of Sydney, Sydney, NSW, Australia

* To whom correspondence should be addressed. E-mail: Michael.Ibbotson{at}anu.edu.au.

Previous studies investigating the response properties of neurons in the primary visual cortex of cats and primates have shown that prolonged exposure to optimally oriented, high-contrast gratings leads to a reduction in responsiveness to subsequently presented test stimuli. We recorded from 119 neurons in cat V1 and V2 and found that in a high proportion of cells contrast adaptation also occurs for gratings oriented orthogonal to a neuron's preferred orientation, even though this stimulus did not elicit significant increases in spiking activity. Approximately 20% of neurons adapted equally to all orientations tested and a further 46% showed at least some adaptation to orthogonally oriented gratings, while 20% of neurons did not adapt to orthogonal gratings. The magnitude of contrast adaptation was positively correlated with adapting contrast, but was not related to the spiking activity of the cells. Highly direction-selective neurons produced stronger adaptation to orthogonally oriented gratings than other neurons. Orientation-related adaptation was correlated with the rate of change of orientation tuning in consecutive cells along electrode penetrations that travelled parallel to the cortical layers. Non-oriented adaptation was most common in areas where orientation preference changed rapidly, while orientation-selective adaptation was most common in areas where orientation preference changed slowly. A minority of neurons did not show contrast adaptation (14%). No major differences were found between units in different cortical layers, V1 and V2, or between complex and simple cells. The relevance of these findings to the current understanding of adaptation within the context of orientation column architecture is discussed.




This article has been cited by other articles:


Home page
 J. Neurophysiol.Home page
J. Hegde
How Reliable is the Pattern Adaptation Technique? A Modeling Study
J Neurophysiol, October 1, 2009; 102(4): 2245 - 2252.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
N. A. Crowder, N. S. C. Price, M. J. Mustari, and M. R. Ibbotson
Direction and Contrast Tuning of Macaque MSTd Neurons During Saccades
J Neurophysiol, June 1, 2009; 101(6): 3100 - 3107.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurosci.Home page
A. J. Camp, C. Tailby, and S. G. Solomon
Adaptable Mechanisms That Regulate the Contrast Response of Neurons in the Primate Lateral Geniculate Nucleus
J. Neurosci., April 15, 2009; 29(15): 5009 - 5021.
[Abstract] [Full Text] [PDF]

Home page
 J. Physiol.Home page
N. A. Crowder, M. A. Hietanen, N. S. C. Price, C. W. G. Clifford, and M. R. Ibbotson
Dynamic contrast change produces rapid gain control in visual cortex
J. Physiol., September 1, 2008; 586(17): 4107 - 4119.
[Abstract] [Full Text] [PDF]

Home page
 J. Physiol.Home page
M. A. Hietanen, N. A. Crowder, N. S. C. Price, and M. R. Ibbotson
Influence of adapting speed on speed and contrast coding in the primary visual cortex of the cat
J. Physiol., October 15, 2007; 584(2): 451 - 462.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
N. A. Crowder, J. van Kleef, B. Dreher, and M. R. Ibbotson
Complex Cells Increase Their Phase Sensitivity at Low Contrasts and Following Adaptation
J Neurophysiol, September 1, 2007; 98(3): 1155 - 1166.
[Abstract] [Full Text] [PDF]

Home page
 J. Neurophysiol.Home page
M. A. Hietanen, N. A. Crowder, and M. R. Ibbotson
Contrast Gain Control Is Drift-Rate Dependent: An Informational Analysis
J Neurophysiol, February 1, 2007; 97(2): 1078 - 1087.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH
Visit Other APS Journals Online
Copyright © 2005 by the The American Physiological Society.