Temporal Expectation Hastens Decision Onset But Does Not Affect Evidence Quality.

Area of Science:

• Cognitive Neuroscience
• Human Perception

Background:

• Temporal expectation significantly impacts human information processing and perceptual decision-making.
• The precise locus of temporal expectation's effect (decision vs. non-decisional processes) remains debated.

Purpose of the Study:

• To investigate whether temporal expectations influence the decision process itself or non-decisional (sensory/motor) processes.
• To differentiate between expedited decision onset and enhanced sensory evidence quality as mechanisms of temporal expectation.

Main Methods:

• Utilized a temporal cueing paradigm with predictive auditory cues and low-contrast visual stimuli.
• Applied sequential sampling modeling (drift diffusion modeling) to behavioral data.
• Employed electroencephalography (EEG) to analyze neural signatures of decision formation.

Main Results:

• Behavioral modeling indicated temporal expectations accelerated non-decisional processes without affecting decision formation.
• EEG data revealed that temporal expectations hastened the onset of decision formation neural signatures but not their build-up rate.
• Anticipatory alpha (α) band power correlated with the onset latency variability of the decision process.

Conclusions:

• Temporal expectations enhance perception primarily by speeding up the initiation of the decision process.
• These findings provide strong evidence that temporal predictions optimize sensory interactions by modulating non-decisional timing.