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  • 1
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    Visual search in a forced-choice paradigm (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The processing of visual information was investigated in the context of two visual search tasks. The first was a forced-choice task in which one of two alternative letters appeared in a visual display of from one to five letters. The second task included trials on which neither of the two alternatives was present in the display. Search rates were estimated from the slopes of best linear fits to response latencies plotted as a function of the number of items in the visual display. These rates were found to be much slower than those estimated in yes-no search tasks. This result was interpreted as indicating that the processes underlying visual search in yes-no and forced-choice tasks are not the same.
    Keywords: BEHAVIORAL SCIENCES
    Type: Perception and Psychophysics; 16; Oct. 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    The effect of a visual indicator on rate of visual search Evidence for processing control (1974)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Search rates were estimated from response latencies in a visual search task of the type used by Atkinson et al. (1969), in which a subject searches a small set of letters to determine the presence or absence of a predesignated target. Half of the visual displays contained a marker above one of the letters. The marked letter was the only one that had to be checked to determine whether or not the display contained the target. The presence of a marker in a display significantly increased the estimated rate of search, but the data clearly indicated that subjects did not restrict processing to the marked item. Letters in the vicinity of the marker were also processed. These results were interpreted as showing that subjects are able to exercise some degree of control over the search process in this type of task.
    Keywords: BIOSCIENCES
    Type: Perception and Psychophysics; 15; June 197
    Format: text
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    NASA TECHNICAL REPORTS
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