| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH |
|
|
|
|||||||
|
|||||||||
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
* To whom correspondence should be addressed. E-mail: anne.b.sereno{at}uth.tmc.edu.
In the posterior parietal cortex of monkeys, the lateral intraparietal area (LIP) contains neurons whose activity changes when the animal attends to, remembers, and looks towards targets. We recorded from isolated neurons during both a spatial and a shape match-to-sample task in order to examine and characterize voluntary active processes in LIP. Many LIP neurons show spatially-selective activity during the delay period that depends on the location of the sample, but for most cells this activity does not differ between the two tasks. Although much past work in posterior parietal cortex has explained responses there in terms of active processes such as decision-making and motor planning, our findings suggest that much of that activity represents more passive processing. Nevertheless, we do see a significant minority of units that demonstrate instruction-dependent activity during the delay period, suggesting that these units could represent the neural correlates of voluntary or active processes. Separately, we found that during the presentation of the sample stimulus and test array, some units show stronger responses to the stimulus in the shape-matching task when the animal must attend to the shape of a stimulus. This elevated response to the sample during the shape task provides evidence for feature-based attention in LIP. Attention to shape is a property that has not previously been described in primate cortex.
This article has been cited by other articles:
|
|
 |
|
  X. Peng, M. E. Sereno, A. K. Silva, S. R. Lehky, and A. B. Sereno Shape Selectivity in Primate Frontal Eye Field J Neurophysiol, August 1, 2008; 100(2): 796 - 814. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 P. Janssen, S. Srivastava, S. Ombelet, and G. A. Orban Coding of Shape and Position in Macaque Lateral Intraparietal Area J. Neurosci., June 25, 2008; 28(26): 6679 - 6690. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 A. Ikkai and C. E. Curtis Cortical Activity Time Locked to the Shift and Maintenance of Spatial Attention Cereb Cortex, June 1, 2008; 18(6): 1384 - 1394. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 G. F. WOODMAN and E. K. VOGEL Selective storage and maintenance of an object's features in visual working memory Psychon Bull Rev, February 1, 2008; 15(1): 223 - 229. [Abstract] [PDF]
|
|
|
|
|
|
M. V. Chafee, B. B. Averbeck, and D. A. Crowe Representing Spatial Relationships in Posterior Parietal Cortex: Single Neurons Code Object-Referenced Position Cereb Cortex, December 1, 2007; 17(12): 2914 - 2932. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
F. C. Joelving, A. Compte, and C. Constantinidis Temporal Properties of Posterior Parietal Neuron Discharges During Working Memory and Passive Viewing J Neurophysiol, March 1, 2007; 97(3): 2254 - 2266. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. R. Lehky and K. Tanaka Enhancement of Object Representations in Primate Perirhinal Cortex During a Visual Working-Memory Task J Neurophysiol, February 1, 2007; 97(2): 1298 - 1310. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
S. R. Lehky and A. B. Sereno Comparison of Shape Encoding in Primate Dorsal and Ventral Visual Pathways J Neurophysiol, January 1, 2007; 97(1): 307 - 319. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH |
| Visit Other APS Journals Online |
