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  Perceptual learning of novel biological movements in the human visual brain

Jastorff, J., Giese, M., & Kourtzi, Z. (2004). Perceptual learning of novel biological movements in the human visual brain. In 34th Annual Meeting of the Society for Neuroscience (Neuroscience 2004).

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0013-D781-A Version Permalink: http://hdl.handle.net/21.11116/0000-0005-66E0-B
Genre: Meeting Abstract

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Jastorff, J, Author              
Giese, MA, Author              
Kourtzi, Z1, 2, 3, Author              
Affiliations:
1Department Human Perception, Cognition and Action, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497797              
2Department Physiology of Cognitive Processes, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497798              
3Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: Learning has been proposed to contribute to the recognition of biological movements. We investigated the neural correlates of these learning processes by using event-related fMRI adaptation. This paradigm entails repeated presentation of a stimulus resulting in decreased fMRI responses, compared to stronger responses after a change in a stimulus dimension indicating selectivity of the measured neural populations to this changed dimension. Novel biological movements were generated by linear combination of triples of prototypical trajectories of human movements (Giese Poggio, 2000). Subjects had to discriminate between identical, very similar, moderately similar and completely different point-light stimulus pairs. The difficulty of the discrimination task could be precisely controlled by choosing appropriate weight vectors. The subjects were scanned before and after a training period of three days. Areas relevant to the processing of biological motion (retinotopic visual areas, hMT+/V5, KO, FFA, and STSp) were localized as regions of interest. Before training, the observers discriminated successfully between the stimuli in the moderately similar and completely different pairs but not between the very similar pairs. Consistent with these psychophysical data, we observed significantly stronger fMRI responses for moderately similar and completely different pairs but not for very similar pairs compared to identical pairs in the FFA and STSp. However, after training the observers’ discrimination performance for very similar pairs improved and significantly stronger fMRI responses were observed for this condition compared to identical pairs in all the higher visual areas. These results suggest that learning tunes neural populations in the STS and FFA for the discrimination of novel biological movements.

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 Dates: 2004-10
 Publication Status: Published online
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 Identifiers: BibTex Citekey: JastorffGK2004
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Title: 34th Annual Meeting of the Society for Neuroscience (Neuroscience 2004)
Place of Event: San Diego, CA, USA
Start-/End Date: 2004-10-23 - 2004-10-27

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Title: 34th Annual Meeting of the Society for Neuroscience (Neuroscience 2004)
Source Genre: Proceedings
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Pages: - Volume / Issue: - Sequence Number: 15.3 Start / End Page: - Identifier: -