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Visual knowledge of three-dimensiona...

Reichel, Francene Donna.

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Visual knowledge of three-dimensional surface structure.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Visual knowledge of three-dimensional surface structure./
Author:	Reichel, Francene Donna.
Description:	62 p.
Notes:	Source: Dissertation Abstracts International, Volume: 52-06, Section: B, page: 3326.
Contained By:	Dissertation Abstracts International52-06B.
Subject:	Psychology, Experimental. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9129771

Visual knowledge of three-dimensional surface structure.
Reichel, Francene Donna.

Visual knowledge of three-dimensional surface structure. - 62 p.

Source: Dissertation Abstracts International, Volume: 52-06, Section: B, page: 3326.

Thesis (Ph.D.)--Brandeis University, 1991.

Visual knowledge about 3-dimensional structure has traditionally been assumed to rely on a point-by-point mapping of depth and orientation. We have argued recently, however, that visual knowledge of smoothly curved surfaces can also be defined in terms of local, nonmetric order relations (Todd & Reichel, 1989). The present research was designed to investigate the compatibility between human observers' knowledge about 3-dimensional form, and these previously proposed metric and ordinal representations of form. Primarily, we focussed on two questions: (1) What are the alternatives for describing 3-dimensional shape? and (2) How can we probe and measure human visual knowledge in order to evaluate the psychological relevance of different styles of shape description? In three experiments, observers viewed computer generated images of smoothly curved surfaces. Observers performed two tasks that were designed specifically as indices of metric and ordinal styles of shape description. The ordinal task required observers to judge the relative depth order of two surface regions, whereas the metric task required more precise knowledge about the magnitude of depth difference between surface regions. Using these tasks as probes, these experiments tested various assumptions about the nature of observers' visual knowledge. The results of the experiments reconfirm our earlier findings that visual knowledge is not fundamentally based on a metric mapping of depth and orientation. Observers performance does suggest, however, that we are capable of making judgments about 3-dimensional form at different levels of precision, including a level at which some metric information (about relative magnitudes of depth difference) is available. Furthermore, knowledge about magnitudes (metric knowledge), and knowledge about local order relationships (ordinal knowledge) share a number of processing characteristics, suggesting that they do not result from independent visual maps. The methodologies used in these studies were developed as general tools for quantitatively probing various aspects of observers' knowledge. This will facilitate future research in the area of 3-dimensional form perception.Subjects--Topical Terms:

517106
Psychology, Experimental.

Visual knowledge of three-dimensional surface structure.
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008 130515s1991 ||||||||||||||||| ||eng d
035 $a (UMI)AAI9129771
035 $a AAI9129771
040 $a UMI $c UMI
100 1 $a Reichel, Francene Donna. $3 1675990
245 1 0 $a Visual knowledge of three-dimensional surface structure.
300 $a 62 p.
500 $a Source: Dissertation Abstracts International, Volume: 52-06, Section: B, page: 3326.
500 $a Adviser: James T. Todd.
502 $a Thesis (Ph.D.)--Brandeis University, 1991.
520 $a Visual knowledge about 3-dimensional structure has traditionally been assumed to rely on a point-by-point mapping of depth and orientation. We have argued recently, however, that visual knowledge of smoothly curved surfaces can also be defined in terms of local, nonmetric order relations (Todd & Reichel, 1989). The present research was designed to investigate the compatibility between human observers' knowledge about 3-dimensional form, and these previously proposed metric and ordinal representations of form. Primarily, we focussed on two questions: (1) What are the alternatives for describing 3-dimensional shape? and (2) How can we probe and measure human visual knowledge in order to evaluate the psychological relevance of different styles of shape description? In three experiments, observers viewed computer generated images of smoothly curved surfaces. Observers performed two tasks that were designed specifically as indices of metric and ordinal styles of shape description. The ordinal task required observers to judge the relative depth order of two surface regions, whereas the metric task required more precise knowledge about the magnitude of depth difference between surface regions. Using these tasks as probes, these experiments tested various assumptions about the nature of observers' visual knowledge. The results of the experiments reconfirm our earlier findings that visual knowledge is not fundamentally based on a metric mapping of depth and orientation. Observers performance does suggest, however, that we are capable of making judgments about 3-dimensional form at different levels of precision, including a level at which some metric information (about relative magnitudes of depth difference) is available. Furthermore, knowledge about magnitudes (metric knowledge), and knowledge about local order relationships (ordinal knowledge) share a number of processing characteristics, suggesting that they do not result from independent visual maps. The methodologies used in these studies were developed as general tools for quantitatively probing various aspects of observers' knowledge. This will facilitate future research in the area of 3-dimensional form perception.
590 $a School code: 0021.
650 4 $a Psychology, Experimental. $3 517106
690 $a 0623
710 2 $a Brandeis University. $3 1017415
773 0 $t Dissertation Abstracts International $g 52-06B.
790 1 0 $a Todd, James T., $e advisor
790 $a 0021
791 $a Ph.D.
792 $a 1991
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=9129771