Bayesian calibration of simultaneity in audiovisual temporal order judgments

Area of Science:

• Neuroscience
• Psychology
• Sensory Perception

Background:

• Lag adaptation causes simultaneous perception of lagged audiovisual stimuli.
• Bayesian calibration, observed with tactile stimuli, predicts opposite perceptual shifts.
• Bayesian calibration's effect on audiovisual stimuli is hypothesized to be masked by lag adaptation.

Purpose of the Study:

• To investigate the pitch-sensitivity of lag adaptation in audiovisual temporal order judgment.
• To determine if Bayesian calibration influences audiovisual temporal order judgments.
• To elucidate the interaction between lag adaptation and Bayesian calibration.

Main Methods:

• Participants judged the temporal order of audiovisual stimuli with varying lag times.
• Lag adaptation was dissociated from Bayesian calibration by manipulating sound pitch and stimulus presentation order.
• Experiments utilized two distinct sound frequencies (1046 Hz and 1480 Hz).

Main Results:

• Lag adaptation was confirmed to be pitch-insensitive.
• When stimuli of different pitches were presented in separate blocks, results aligned with lag adaptation.
• When stimuli of different pitches were presented in a randomized order, Bayesian calibration effects became apparent and were pitch-specific.

Conclusions:

• Bayesian calibration is pitch-specific and operates independently of pitch-insensitive lag adaptation.
• These findings reveal that Bayesian calibration influences audiovisual temporal order judgments, but its effects are masked by lag adaptation under typical conditions.
• The study disentangles two distinct perceptual mechanisms governing audiovisual timing.