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ERIC Number: ED226333
Record Type: Non-Journal
Publication Date: 1982-Aug
Pages: 10
Abstractor: N/A
Reference Count: N/A
Linear and Non-Linear Processes in Visual Search of Letter Displays.
Donderi, D. C.
Two experiments investigated the linear and nonlinear processes involved in a visual search of letter displays. The displays used in the experiments were well-illuminated 6 x 6 degree or 10 x 10 degree fields containing from 2 to 23 capital As, Bs, or Cs located randomly over the displays. The task of the subjects was to decide as rapidly as possible whether a predetermined target letter was present in the display. Reaction time functions had both linear and nonlinear components and varied from constant when targets were presented, to strongly curvilinear with one target, to strongly linear with a curvilinear aberration when there were no targets present. The results indicated that there are two separate processes that influence total response time in this type of visual search task--acquisition and decision. Acquisition is a perceptual process and is nonlinear, while decision follows acquisition and is a serial self-terminating search. The results demonstrate that the time to search a display of N letters for the presence or absence of a particular target letter is not always linear. (FL)
Publication Type: Reports - Research; Speeches/Meeting Papers
Education Level: N/A
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A