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Neural mechanisms underlying rivalry...

Meng, Ming.

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Neural mechanisms underlying rivalry, perceptual filling-in and their interactions.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Neural mechanisms underlying rivalry, perceptual filling-in and their interactions./
作者:	Meng, Ming.
面頁冊數:	149 p.
附註:	Adviser: Frank Tong.
Contained By:	Dissertation Abstracts International67-02B.
標題:	Biology, Neuroscience. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3208893
ISBN:	9780542572500

Neural mechanisms underlying rivalry, perceptual filling-in and their interactions.
Meng, Ming.

Neural mechanisms underlying rivalry, perceptual filling-in and their interactions. - 149 p.

Adviser: Frank Tong.

Thesis (Ph.D.)--Princeton University, 2006.

Visual perception relies on both selective and constructive perceptual processes. For example, binocular rivalry leads to the selective perception of one of two competing monocular stimuli, whereas visual phantom formation leads to perceptual filling-in of a large gap between two collinearly aligned gratings. In this thesis, I explore the role of perceptual and attentional mechanisms in binocular rivalry and perceptual filling-in, and investigate the neural interactions between rivalry and filling-in to gain new insights into the nature of these perceptual phenomena.

ISBN: 9780542572500Subjects--Topical Terms:

1017680
Biology, Neuroscience.

Neural mechanisms underlying rivalry, perceptual filling-in and their interactions.
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502 $a Thesis (Ph.D.)--Princeton University, 2006.
520 $a Visual perception relies on both selective and constructive perceptual processes. For example, binocular rivalry leads to the selective perception of one of two competing monocular stimuli, whereas visual phantom formation leads to perceptual filling-in of a large gap between two collinearly aligned gratings. In this thesis, I explore the role of perceptual and attentional mechanisms in binocular rivalry and perceptual filling-in, and investigate the neural interactions between rivalry and filling-in to gain new insights into the nature of these perceptual phenomena.
520 $a Chapter 1 compares selective attentional modulation of binocular rivalry and Necker cube reversal. Observers showed much weaker selective attentional control for rivalry than for Necker cube reversal, supporting the notion that binocular rivalry involves a more automatic, stimulus-driven form of visual competition than ambiguous figure reversal. In Chapter 2, I provide neuroimaging evidence indicating that visual phantoms lead to enhanced activity in areas V1 and V2, independently of where the observers attended. These results suggest that constructive filling-in of visual phantoms may result from automatic neural filling-in at the earliest stages of cortical processing. In Chapter 3, I provide converging psychophysical and fMRI evidence that binocular rivalry can fully gate the formation of visual phantoms, suggesting that the neural mechanisms underlying binocular rivalry can strongly influence and even suppress the mechanisms underlying visual phantom formation. Chapter 4 shows that illusory phantom gratings can also rival with real gratings. Moreover, this rivalry competition between phantom gratings and real gratings appears to be interocular rather than eye independent. These results suggest that the constructive mechanisms underlying perceptual filling-in can also influence the selective mechanisms underlying rivalry, indicating bi-directional interactions between rivalry and filling-in.
520 $a My experiments provide compelling new evidence suggesting that the neural mechanisms underlying selective perception and constructive perception both operate at early stages of visual processing, and that dynamic interactions can take place between these mechanisms at these same early sites. Moreover, the mechanistic approach, which this thesis takes to study visual awareness, is more promising to help us understand how consciousness arises as a consequence of brain activity than merely searching for the neural correlates of consciousness.
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