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Viewpoints, faces, and the N170 ERP ...

D'Lauro, Christopher.

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Viewpoints, faces, and the N170 ERP component.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Viewpoints, faces, and the N170 ERP component./
作者:	D'Lauro, Christopher.
面頁冊數:	101 p.
附註:	Source: Dissertation Abstracts International, Volume: 71-10, Section: B, page: 6457.
Contained By:	Dissertation Abstracts International71-10B.
標題:	Cognitive psychology. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3419450
ISBN:	9781124194035

Viewpoints, faces, and the N170 ERP component.
D'Lauro, Christopher.

Viewpoints, faces, and the N170 ERP component. - 101 p.

Source: Dissertation Abstracts International, Volume: 71-10, Section: B, page: 6457.

Thesis (Ph.D.)--University of Colorado at Boulder, 2010.

The visual system must solve the difficult problem of recognizing a single object from many viewpoints. Recent studies have shown that people learn specific views of objects and recognize objects best in these previously seen views. The current work tested the timing of these view-dependent aspects of object recognition using Event-Related Potentials (ERPs). One widely studied ERP component, the N170, becomes enhanced for frequently seen objects like faces. These experiments attempted to evaluate the view-sensitivity of the N170, predicting it to be viewpoint-sensitive. In each experiment, subjects were shown a first (adapting) face for three seconds, a second (test) face briefly, and were asked to judge if these faces matched. Subjects were adapted to the first face, fatiguing the neurons representing it. Consequently, the more the neurons representing the first and second faces overlapped, the less firing the second face would elicit. This reduction in activity (adaptation effect) indicates how similar two objects are at the neuron level. Faces in this experiment were presented frontally or facing 30° to the right. In Experiment 1, the test face varied in viewpoint (consistent or changed from adapting face) and identity (same, different person). Results showed viewpoint significantly affected the N170, but identity did not. The slightly later identity-sensitive N250 ERP component showed both identity and viewpoint sensitivity. Experiment 2 presented fully counterbalanced face orientations from the Experiment 1 stimuli. Results matched predictions as the N170 showed both identity and viewpoint sensitivity, as did the N250. In Experiment 3, subjects performed both identity and gender matching blocks of the same matching task. The N170 showed viewpoint sensitivity. The gender matching block produced greater N170s than the identity matching block. The N250 showed viewpoint sensitivity and differentiated gender trials but not identity trials. Ultimately, these three experiments produced two primary results. They confirmed the processes underlying the N170 can differentiate faces of different individuals in a repetition-adaptation paradigm. More importantly, all three studies demonstrated the viewpoint-sensitivity of the N170, providing more converging neural evidence for view-dependent theories of object recognition.

ISBN: 9781124194035Subjects--Topical Terms:

523881
Cognitive psychology.

Viewpoints, faces, and the N170 ERP component.
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