The effect of familiarity in early vision: Letter perception.
Item
-
Title
-
The effect of familiarity in early vision: Letter perception.
-
Identifier
-
AAI9605611
-
identifier
-
9605611
-
Creator
-
Kim, Huykang.
-
Contributor
-
Adviser: Wayne P. Silverman
-
Date
-
1995
-
Language
-
English
-
Publisher
-
City University of New York.
-
Subject
-
Psychology, Experimental
-
Abstract
-
The effect of familiarity on early visual processing was examined with two letters, 'p' and 'b,' as instances of familiar stimuli, and two unfamiliar letter-like items, 'non-p' and 'non-b,' created by displacing the loops within the 'p' and 'b' to the left of the vertical lines.;The hypothesis was that there might be featural level interactions within familiar contexts (e.g., letters) rendering a line feature in a 'p' qualitatively different from the same line feature within a 'b.' Similar interactions would not exist for unfamiliar items, and therefore the line feature within a 'non-p' would remain the same as that of a 'non-b.'.;For the 'line' experiments, tasks required subjects to find a longer line among arrays of shorter lines of equal length in one condition, or to find a shorter line among arrays of longer lines in another condition. For the letter experiments, the target was and distractors were 'b's, but the 'p' appeared in all arrays. The 'p' was longer or shorter than the 'b's in target-present arrays, and the same length as the 'b's in target-absent arrays. The same configurations were used for the non-letter experiments with the 'non-p' and 'non-b' items.;For the short target conditions, overall the reaction time was faster for target-present arrays than for target-absent arrays in both the 'line' and the 'non-pb' arrays. For the long target conditions, the difference of reaction time between the target-present and the target-absent arrays was larger for the 'non-pb' arrays than for the 'line' arrays.;The search speed difference between the target-present and the target-absent arrays was in general absent for the 'pb' arrays when the targets were short items. If the target items were long, the search speed was slower for the target-absent trials than for the target-present trials, however still to a lesser degree than they were in the 'non-pb' arrays.;Therefore, for the short target conditions the 'non-pb' data patterns were similar to the 'line' data patterns, whereas the 'pb' data were qualitatively distinctive. For the long target conditions the evidence for qualitatively different lines in familiar stimuli was less clear.
-
Type
-
dissertation
-
Source
-
PQT Legacy CUNY.xlsx
-
degree
-
Ph.D.
