Habituation to onsets is controlled by spatially selective distractor expectation

Area of Science:

• Cognitive Psychology
• Neuroscience
• Visual Perception

Background:

• Habituation to onset distractors is stronger with higher distractor probability.
• Previous studies confounded distractor probability with distractor numerosity, leaving the underlying mechanism unclear.
• Distinguishing between expectation-based (Sokolov model) and stimulation-driven (Groves & Thompson model) habituation is crucial.

Purpose of the Study:

• To investigate whether distractor habituation is controlled by expectation or mere stimulation.
• To isolate the effect of distractor probability on habituation, independent of distractor number.
• To determine the spatial specificity of habituation to onset distractors.

Main Methods:

• Manipulated distractor probability at a fixed location while keeping distractor numerosity constant.
• Conducted three experiments to test different hypotheses regarding habituation mechanisms.
• Controlled for temporal frequency differences in distractor presentation.

Main Results:

• Experiment 1 supported the Sokolov model, indicating habituation is controlled by distractor expectation.
• Habituation of capture is driven by expectation, even with a fixed number of distractors.
• Experiments 2 and 3 showed habituation is primarily influenced by local distractor occurrence rates, demonstrating spatial specificity.

Conclusions:

• Habituation of visual capture is primarily driven by the expectation of distractor occurrence.
• The process is largely spatially specific, relying on local rather than global distractor rates.
• Findings support an expectation-based model of habituation in visual attention.