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oai:www.ideals.illinois.edu:2142/79808 2023-07-11 col_2142_5131 col_2142_8800 com_2142_5130 com_2142_5132

McConkie, George W. Tai, Yu-Chi 2015-09-25T19:53:48Z 2015-09-25T19:53:48Z 10000-01-01 2004 2004 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. Made available in DSpace on 2015-09-25T19:53:48Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 3153438.pdf: 11614645 bytes, checksum: fcff3c2e63c22f72030d437bf8fc704b (MD5) Previous issue date: 2004 Embargo set by: Seth Robbins for item 81090 Lift date: Forever Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs Restricted to the U of I community idenfinitely during batch ingest of legacy ETDs U of I Only 217 p. Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2004. http://hdl.handle.net/2142/79808 (MiAaPQ)AAI3153438 eng Education, Educational Psychology Visual Enumeration: Subitizing and Its Nature text Education Education University of Illinois at Urbana-Champaign Dissertation Ph.D.