A trial will began with subjects fixating the center of the screen. When subjects press a button, 9 placeholders (gray X's) will appear. |
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After 1 sec., a cue will appear to either the right or the left of the placeholder image. Subjects will look at the cue. |
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600 msec after the saccade is detected, 3 late onset X's will appear. |
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100 msec later, they will disappeare. |
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48 msec later, they will reappear. This will be a signal to subjects to send their eyes back into the main image in order to search for the target in one of the 3 late onset locations. |
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During the saccade, there will be no display change. The world will be visually the same both before and after the eye movement |
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At some point into the saccade, all the X's will change to either red or green titled lines. Note that a search among the objects in the 3 late onset locations will constitute a feature search. However, if subjects search the entire display, it will be a conjunction search. |
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