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The Journal of Neuroscience, September 20, 2006, 26(38):9639-9645; doi:10.1523/JNEUROSCI.2273-06.2006

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Behavioral/Systems/Cognitive
Dissociation Between Local Field Potentials and Spiking Activity in Macaque Inferior Temporal Cortex Reveals Diagnosticity-Based Encoding of Complex Objects

Kristina J. Nielsen, Nikos K. Logothetis, and Gregor Rainer

Max Planck Institute for Biological Cybernetics, D-72076 Tübingen, Germany

Correspondence should be addressed to Dr. Gregor Rainer, Max Planck Institute for Biological Cybernetics, Spemannstrasse 38, D-72076 Tübingen, Germany. Email: gregor.rainer{at}tuebingen.mpg.de

Neurons in the inferior temporal (IT) cortex respond selectively to complex objects, and maintain their selectivity despite partial occlusion. However, relatively little is known about how the occlusion of different shape parts influences responses in the IT cortex. Here, we determine experimentally which parts of complex objects monkeys are relying on in a discrimination task. We then study the effect of occlusion of parts with different behavioral relevance on neural responses in the IT cortex at the level of spiking activity and local field potentials (LFPs). For both spiking activity and LFPs, we found that the diagnostic object parts, which were important for behavioral judgments, were preferentially represented in the IT cortex. Our data show that the effects of diagnosticity grew systematically stronger along a posterior–anterior axis for LFPs, but were evenly distributed for single units, suggesting that diagnosticity is first encoded in the posterior IT cortex. Our findings highlight the power of combined analysis of field potentials and spiking activity for mapping structure to computational function in the brain.

Key words: monkey; visual cognition; object recognition; electrophysiology; psychophysics; behavior

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Received May 29, 2006; revised July 21, 2006; accepted Aug. 10, 2006.

Correspondence should be addressed to Dr. Gregor Rainer, Max Planck Institute for Biological Cybernetics, Spemannstrasse 38, D-72076 Tübingen, Germany. Email: gregor.rainer{at}tuebingen.mpg.de

This article has been cited by other articles:

				B. Anderson, R. E.B. Mruczek, K. Kawasaki, and D. Sheinberg Effects of Familiarity on Neural Activity in Monkey Inferior Temporal Lobe Cereb Cortex, February 21, 2008; (2008) bhn015v1. [Abstract] [Full Text] [PDF]

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