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  Using the Local Field Potential (LFP) Recorded from the Inferior-Temporal Cortex of a Macaque Monkey to Study Species-Dependent (Monkey/human) Face Processing

Sigala, R., Veit, J., Logothetis, N., & Rainer, G. (2007). Using the Local Field Potential (LFP) Recorded from the Inferior-Temporal Cortex of a Macaque Monkey to Study Species-Dependent (Monkey/human) Face Processing. Poster presented at 10th Tübinger Wahrnehmungskonferenz (TWK 2007), Tübingen, Germany.

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 Creators:
Sigala, R1, 2, Author           
Veit, J1, 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              

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 Abstract: Recently, we have been able to read out a human/monkey face category-boundary from singleunit-activity (SUA) recorded from the inferior-temporal (IT) cortex of a macaque monkey
brain. This data was collected in an experiment where monkeys have to fixate at pictures of
human/monkey morphed faces at different levels of this ‘species-continuum’. Consistent with
our previous psychophysical experiments in which human subjects have to categorize morphed
faces as humans or monkeys, the perceptual boundary seems to be shifted towards the
‘own-species’ category (approximately 60 human/40 monkey in humans and the other way
around in the monkey data). Similar to the ‘other-race’ effect, this effect suggests a perceptual
bias that could be due to long-term learning.
The local field potential (LFP) refers to the low-frequency (< 300Hz) component of signals
recorded from the brain, and it has been associated with dendritic activity within a particular
recording area. In this work we investigate to what extent these LFP signals are stimulus
selective and weather they correlate with our previous results obtained from the simultaneously
recorded spiking activity (SUA).To achieve that, we first extract different features from the LFP
signals such peak amplitude, time-onset or the spectral power of different frequency bands. To
evaluate the information content of these features in relation to our stimulus and the spiking
data, we use statistical analyses, information theory and pattern classification.
Preliminary results show that features such as peak onset-time and peak-amplitude differ
significantly across stimulus-conditions. In contrast to the spiking data, when using these features,
the pattern classifiers set the face category-border without a consistent shift towards the
monkey category. Further analysis of these features using information theory will be needed to
test possible correlations with the spiking data and the stimulus properties.

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 Dates: 2007-07
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: BibTex Citekey: 4886
 Degree: -

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Title: 10th Tübinger Wahrnehmungskonferenz (TWK 2007)
Place of Event: Tübingen, Germany
Start-/End Date: 2007-07-27 - 2007-07-29

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Title: 10th Tübinger Perception Conference: TWK 2007
Source Genre: Proceedings
 Creator(s):
Bülthoff, HH1, Editor           
Chatziastros, A1, Editor           
Mallot, HA, Editor           
Ulrich, R, Editor
Affiliations:
1 Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797            
Publ. Info: Kirchentellinsfurt, Germany : Knirsch
Pages: - Volume / Issue: - Sequence Number: - Start / End Page: 117 Identifier: ISBN: 3-927091-77-4