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Visual information processing during...

Willenbockel, Verena.

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Visual information processing during conscious and non-conscious face perception.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Visual information processing during conscious and non-conscious face perception./
Author:	Willenbockel, Verena.
Description:	220 p.
Notes:	Source: Dissertation Abstracts International, Volume: 75-04(E), Section: B.
Contained By:	Dissertation Abstracts International75-04B(E).
Subject:	Psychology, Cognitive. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR98786
ISBN:	9780494987865

Visual information processing during conscious and non-conscious face perception.
Willenbockel, Verena.

Visual information processing during conscious and non-conscious face perception. - 220 p.

Source: Dissertation Abstracts International, Volume: 75-04(E), Section: B.

Thesis (Ph.D.)--Universite de Montreal (Canada), 2013.

Natural stimuli impinging on our retinas provide us with a wealth of visual information. This information varies along "low-level" features, such as luminance, contrast, and spatial frequency (SF). Whereas some of this information reaches our awareness, some of it is processed in the brain without us ever becoming aware of it (i.e., non-consciously). A remaining question is precisely which SFs influence brain activation and behavior consciously vs. non-consciously. The aim of this thesis was to address this question using state-of the-art psychophysical techniques.

ISBN: 9780494987865Subjects--Topical Terms:

1017810
Psychology, Cognitive.

Visual information processing during conscious and non-conscious face perception.
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020 $a 9780494987865
035 $a (MiAaPQ)AAINR98786
035 $a AAINR98786
040 $a MiAaPQ $c MiAaPQ
100 1 $a Willenbockel, Verena. $3 2103552
245 1 0 $a Visual information processing during conscious and non-conscious face perception.
300 $a 220 p.
500 $a Source: Dissertation Abstracts International, Volume: 75-04(E), Section: B.
500 $a Advisers: Frederic Gosselin; Franco Lepore.
502 $a Thesis (Ph.D.)--Universite de Montreal (Canada), 2013.
520 $a Natural stimuli impinging on our retinas provide us with a wealth of visual information. This information varies along "low-level" features, such as luminance, contrast, and spatial frequency (SF). Whereas some of this information reaches our awareness, some of it is processed in the brain without us ever becoming aware of it (i.e., non-consciously). A remaining question is precisely which SFs influence brain activation and behavior consciously vs. non-consciously. The aim of this thesis was to address this question using state-of the-art psychophysical techniques.
520 $a The first article introduces the SHINE (spectrum, histogram, and intensity normalization and equalization) toolbox for controlling low-level image properties in MATLAB. The second article describes and validates the SF Bubbles technique, which was used throughout the studies in this thesis to map SF tuning for various face perception tasks with a high SF resolution and low experimental bias. The third and fourth articles focus on SF processing as a function of awareness. In the former, SF Bubbles was employed together with repetition priming and masking to investigate which SFs are correlated with observers' behavioral responses during conscious vs. non-conscious face-gender perception. The results show that the same SFs significantly influenced response times in both prime awareness conditions but, surprisingly, in opposite ways. In the latter, SF Bubbles was combined with intracranial recordings from awake human patients and Continuous Flash Suppression (Tsuchiya & Koch, 2005). This allowed us to map the SFs that modulate activation in specific brain structures (the insula and the amygdala) during the conscious vs. non-conscious perception of emotional facial expressions. The results for both regions demonstrate that non-conscious perception relied on low SFs more and was faster than conscious perception.
520 $a The contribution made in this thesis is thus two-fold: methodological contributions to visual perception research are made by introducing the SHINE toolbox and the SF Bubbles technique, and insights into the "informational correlates" of consciousness are provided from two different angles.
520 $a Keywords: face perception, spatial frequency, visual consciousness.
590 $a School code: 0992.
650 4 $a Psychology, Cognitive. $3 1017810
650 4 $a Psychology, Physiological. $3 1017869
650 4 $a Biology, Neuroscience. $3 1017680
650 4 $a Psychology, Behavioral. $3 1017677
690 $a 0633
690 $a 0989
690 $a 0317
690 $a 0384
710 2 $a Universite de Montreal (Canada). $b Psychology. $3 2103553
773 0 $t Dissertation Abstracts International $g 75-04B(E).
790 $a 0992
791 $a Ph.D.
792 $a 2013
793 $a English
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=NR98786