Saccade endpoints reflect attentional templates in visual search: Evidence from feature distribution learning

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Perception

Background:

• Gaze in visual search is guided by attentional templates, which are probabilistic and shaped by environmental regularities.
• Previous research suggests participants can learn to differentiate distractor feature distributions.

Purpose of the Study:

• To investigate if subtle differences in distractor color distributions (Gaussian vs. uniform) are reflected in saccade endpoints during visual search.
• To determine the influence of distractor distribution learning on reaction times and eye movement behavior.

Main Methods:

• Two experiments involved learning trials to prime specific distractor color distributions and test trials to assess responses.
• Saccade endpoints were analyzed for deviations (global effect), and reaction times were recorded.
• Experiments varied in difficulty, with Experiment 2 using more distractors and colors.

Main Results:

• Reaction times and saccade endpoints were influenced by the target color's distance from the mean distractor distribution.
• Increased distance from the mean led to less saccade deviation and faster reaction times.
• Saccade endpoints did not reflect the shape of distractor color distributions, unlike reaction times in Experiment 2.

Conclusions:

• Color priming influences both reaction times and saccade deviations.
• Learning of distractor feature distributions is dependent on search difficulty and the response measure used.
• Saccade endpoints are less sensitive than reaction times to subtle differences in distractor color distribution shapes.