Spatial probability as an attentional cue in visual search

Geng, Joy J.; Behrmann, Marlene · 2005 · OpenAlex-citations

DOI: 10.3758/bf03193557

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Summary

This study investigates whether implicit spatial probabilities regarding target location function as a potent attentional cue in visual search, distinct from explicit endogenous cues or salient exogenous cues. The research addresses the gap in understanding how statistical regularities in stimulus location bias visual processing, specifically examining whether these effects operate independently of repetition priming and how they interact with other known attentional mechanisms. The authors conducted five experiments using a visual search task where participants identified the orientation of a target (a rotated T) among distractors (Ls). In Experiments 1 and 2, targets appeared in high-probability locations on 75% of trials within uneven-probability blocks, compared to random-probability blocks. Experiment 1 utilized eye-tracking and a fixation task to ensure central fixation, analyzing response times (RTs) and accuracy. It also examined repetition priming by comparing trials where the target appeared in the same location as the immediately preceding (1-back) or second preceding (2-back) trial. Experiment 2 manipulated distractor set sizes (four vs. eight items) to assess the inhibitory effects of high-probability locations on low-probability targets. Experiments 3–5 compared spatial probability effects against explicit endogenous cues (arrows) and salient exogenous cues (flashes). Results from Experiments 1 and 2 demonstrated that spatial probability significantly biased attention: targets in high-probability locations were detected faster and more accurately than those in low- or random-probability locations. Crucially, this effect could not be explained solely by repetition priming. While repetition priming occurred in all conditions, facilitation was significantly greater for high-probability locations, and sensitivity to 2-back repetitions was present only in high-probability conditions, not random ones. Furthermore, responses to low-probability targets were slowed only when a distractor occupied the high-probability location, indicating active inhibition of unlikely areas. In Experiments 3–5, facilitation from spatial probability was found to be independent of explicit endogenous cues but interacted with salient exogenous cues. Specifically, the validity effect of exogenous cues was compressed for targets in high-probability locations, suggesting that probabilistic expectations modulate the impact of bottom-up attentional capture. The findings conclude that spatial probabilities constitute a robust, implicit attentional cue that facilitates processing in likely locations and inhibits processing in unlikely ones. This mechanism differs from both top-down explicit cues and bottom-up salient cues, operating as a distinct form of attentional bias derived from statistical regularities. The study establishes that observers implicitly learn and utilize spatial statistics to guide visual search, providing evidence for a probabilistic component of attention that functions alongside, but independently from, traditional cueing mechanisms.

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• visual search