Abstract/Details

Iconic memory, color discrimination and contrast detection


1990 1990

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Abstract (summary)

This thesis consists of three separate psychophysical studies. The first study investigates the role of selective and nonselective transfer processes in partial reports of information from briefly exposed letter arrays using a partial report-plus-mask paradigm. The data obtained allow a decomposition into nonselective and selective transfer, and provide evidence for algebraic addition of the two processes. We present a model which describes the data, as well as partial report data without masks and whole report data from a control condition.

The second study shows the effect of the state of adaptation on color discrimination. We measured discrimination thresholds under two different states of adaptation of the eye. Under one condition, the observer is adapted to the color where thresholds are measured. Under the other we measure thresholds while the observer is adapted to an equal energy white. Discriminability is always better in the first case. The results seem to be mediated by two independent mechanisms which are sensitive to the cardinal directions of color space.

The third study investigates processing of luminance and chromatic signals by the visual system. We find that the efficiency with which the visual system detects a sine-wave pattern in broad-band spatio-temporal noise is the same for luminance and chromatic inputs. Furthermore, a luminance mask does not affect thresholds for chromatic signals and vice versa, indicating that there are no interactions between processing of the two. We measure spectral tuning curves in a variety of directions of color space. These imply the existence of mechanisms sensitive to weighted sums of luminance and chromatic inputs.

Indexing (details)


Subject
Psychology;
Experiments
Classification
0623: Psychology
0623: Experiments
Identifier / keyword
Psychology; memory
Title
Iconic memory, color discrimination and contrast detection
Author
Gegenfurtner, Karl Reiner
Number of pages
177
Publication year
1990
Degree date
1990
School code
0146
Source
DAI-B 51/12, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
Advisor
Krauskopf, John; Movshon, Tony; Sperling, George
University/institution
New York University
University location
United States -- New York
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
9113006
ProQuest document ID
303864854
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/303864854
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