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Number of Fixations in Search*

*Error bars are standard errors of the mean.
Fixations in Search: after the saccade to the search image, this variable represents the average number of fixations made before the subject responds correctly (i.e., a Hit, if the target is present, or Correct Rejection if the target is absent). Note that the count includes the last fixation when the subject press their response button.
3 number of items is the 3 late-onset cue condition (3 X's flashed to constrain the search to 3 locations)
4 number of items is the 4 late-onset cue condition (4 X's flashed to constrain the search to 4 locations)
"all" number of items is the 0 late-onset cue condition (all the X's flashed signaling to subjects to search all 12 locations)

Comments and observations

(Note: the circle symbols are feature trials, and the square symbols are conjunction trials. The closed symbols are target-present trials, and open symbols are target-absent trials).

1. Again, there appears to be a clear effect of number of search items in the feature search target present condition in terms of number of fixations made before subjects to responded correctly: 2.85 fixations, on average, in the late-onset conditions verses 2.5 fixations in the no late-onset (or 12 item search) condition.

 

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