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https://hdl.handle.net/2142/79808
Description
Title
Visual Enumeration: Subitizing and Its Nature
Author(s)
Tai, Yu-Chi
Issue Date
2004
Doctoral Committee Chair(s)
McConkie, George W.
Department of Study
Education
Discipline
Education
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Education, Educational Psychology
Language
eng
Abstract
To examine the role of subitizing in ongoing visual enumeration processes, three experiments were conducted using saccade-continent display change technique and peripheral preview paradigm. The results shows that numerical information of up to 3 or 4 items can be quickly enumerated from an extrafovea display and be used in the following enumeration process when the display comes into fovea in the next fixation. While a valid peripheral preview facilitates enumeration speed, invalid preview information causes a penalty in both accuracy and response time. This difference only occurs for small set enumeration; for large set sizes, enumeration speed is facilitated whether information from the peripheral preview is valid or invalid. These findings suggest subitizing as part of the object perception processes. A surprising difference between two display-change conditions in which one item was either inserted in or removed from the display during a saccade to the stimulus pattern further suggests that subitizing is explained well by the object-file/visual-index theories. The nature of small and large set enumeration processes and their interaction is discussed in the last chapter.
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