Surprise leads to noisier perceptual decisions

Area of Science:

• Cognitive Psychology
• Neuroscience
• Auditory Perception

Background:

• Environmental unpredictability can negatively impact cognitive task performance.
• Two potential mechanisms are complete distraction (lapses) or reduced sensitivity.
• Distinguishing between these mechanisms is crucial for understanding attention and resource allocation.

Purpose of the Study:

• To differentiate between distraction-induced lapses and sensitivity reduction as causes of performance impairment due to environmental unpredictability.
• To investigate the effect of unpredictable auditory loudness changes on a pitch-duration discrimination task.

Main Methods:

• Participants performed an auditory pitch-duration discrimination task.
• Stimulus loudness changed unpredictably in the surprising condition and remained constant in the predictable condition.
• Computational models were used to analyze both lapses and sensitivity changes.

Main Results:

• Performance was slower and less accurate under unpredictable loudness changes.
• Unpredictable changes significantly diminished auditory sensitivity.
• The rate of performance lapses did not increase in the surprising condition.

Conclusions:

• Environmental uncertainty disrupts goal-directed behavior primarily by reducing perceptual sensitivity.
• This suggests a graded withdrawal of perceptual resources rather than complete distraction.
• This adaptive, flexible resource allocation may be beneficial in potentially threatening environments.