Abstract
Intertrial effects such as priming of pop-out (PoP) often occur for task-irrelevant dimensions as well as taskrelevant dimensions, though to a weaker extent. Here we test the hypothesis that increased priming for taskrelevant dimensions is due to greater passive build-up of priming for the task-relevant dimension rather than to an active filtering of task-irrelevant dimensions; if this is the case, then we should observe a positive correlation between the magnitude of task-relevant and taskirrelevant priming. We tested this hypothesis using a pop-out search task in which the task-relevant dimension was orientation and the task-irrelevant dimension was color. We found a strong, positive association between task-relevant and task-irrelevant priming across a large group of participants (N = 100); additionally, we observed increased priming over consecutive repetitions for the task-relevant dimension, whereas task-irrelevant priming was constant across multiple repetitions. As further evidence against an active filtering account, task-irrelevant priming showed no systematic relationship with visual short-term memory capacity, which has been shown to correlate with filtering ability. Together, our results suggest that task-irrelevant dimensions are co-selected rather than filtered out during target search. Further, increased taskrelevant priming may reflect an enhanced representation of the task-relevant dimension that is reinforced over consecutive repetitions.
Original language | English (US) |
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Article number | 14 |
Journal | Journal of vision |
Volume | 14 |
Issue number | 12 |
DOIs | |
State | Published - 2014 |
Keywords
- Priming of pop-out
- Task-relevance
- Visual short term memory
ASJC Scopus subject areas
- Ophthalmology
- Sensory Systems