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ReferencesNavigation arrowAuthorsNavigation arrowDavid Leiser
May 23

“ Knowledge is commonly socially constructed, through collaborative efforts towards shared objectives or by dialogues and challenges brought about by different persons' perspectives. ”

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David Leiser

Picture of David Leiser. Copyright unknown.
Personal Homepage:
http://www.bgu.ac.il/~dleiser

Current place of employment:
Ben Gurion University

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Publications by David Leiser (bibliography)

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2002
 
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Moran, Simone and Leiser, David (2002): The limits of shape constancy: point-to-point mapping of perspective projections of flat figures. In Behaviour and Information Technology, 21 (2) pp. 97-104.

“The present experiments investigate point-to-point mapping of perspective transformations of 2D outline figures under diverse viewing conditions: binocular free viewing, monocular perspective with 2D cues masked by an optic tunnel, and stereoptic viewing through an optic tunnel. The first experiment involved upright figures, and served to determine baseline point-to-point mapping accuracy, which was found to be very good. Three shapes were used: square, circle and irregularly round. The main experiment, with slanted figures, involved only two shapes -- square and irregularly shaped -- showed at several slant degrees. Despite the accumulated evidence for shape constancy when the outline of perspective projections is considered, metric perception of the inner structure of such projections was quite limited. Systematic distortions were found, especially with more extreme slants, and attributed to the joint effect of several factors: anchors, 3D information, and slant underestimation. Contradictory flatness cues did not detract from performance, while stereoptic information improved it.”

© All rights reserved Moran and Leiser and/or Taylor and Francis

1995
 
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Leiser, David, Bereby, Yoella and Melkman, Avraham (1995): A Comparison of Display Methods for Spatial Point Layout. In Behaviour and Information Technology, 14 (3) pp. 135-142.

“A series of six experiments compared several approaches to displaying 3D point information on a CRT screen. The methods used included perspective, motion, stereo, and numeric information, in various combinations. Measures included error rate and reaction times on three tasks, which all involved deciding whether a given configuration of dots exhibits a given property (collinearity, coplanarity, acute angle). Stereo proved to be the best method, being both faster and more accurate than the others. Simply presenting two perspective views is also effective, yet adding azimuthal motion under the subject's control is better on the most demanding task (coplanarity detection), while digital height information combined with a traditional top view (PPI) is slow, and especially inaccurate for coplanarity detection. Finally, the worst methods are the rotational interactive displays. Accuracy does not improve, whereas reaction times are considerably slower.”

© All rights reserved Leiser et al. and/or Taylor and Francis

1990
 
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Meyer, Joachim, Shinar, David and Leiser, David (1990): Time Estimation of Computer "Wait" Message Displays. In: D., Woods, and E., Roth, (eds.) Proceedings of the Human Factors Society 34th Annual Meeting 1990, Santa Monica, USA. pp. 360-364.

“The effect of different types computer "wait" message displays on the subjective estimates of the duration of intervals in which the subject had to wait for the computer response was studied. The displays were either static (a blank screen, the phrase PLEASE WAIT, or an epigram) or dynamic (a blinking PLEASE WAIT, a round clock-like display, or an emerging string of Xs along the center of the screen). Display duration varied from 3 to 16 seconds. The dynamic displays were shown at three different rates each. Results showed differences among the displays. For dynamic displays in which a development over time can be perceived (the clock and string of Xs), there was a direct relation between the rate of change and the estimate, i.e., higher rates of change led to estimates of longer durations. The results demonstrate that some of the variables, which have been found to influence time perception in basic psychological research settings, are applicable in the user-computer setting.”

© All rights reserved Meyer et al. and/or Human Factors Society

 
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Changes to this page (author)

22 Feb 2010: Modified
26 Jun 2007: Added
28 Apr 2003: Added

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URL: http://www.interaction-design.org/references/authors/david_leiser.html
May 23

“ Knowledge is commonly socially constructed, through collaborative efforts towards shared objectives or by dialogues and challenges brought about by different persons' perspectives. ”

-- G. Salomon (in "Distributed Cognitions: Psychological and Educational Considerations")

 
 

Featured chapter

Read the fascinating history of Wearable Computing, told by its father, Steve Mann

Read Steve's chapter !

 
 

Help us help you!

 
 
 
 
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