Multisensory temporal order judgments: when two locations are better than one.

Area of Science:

• Cognitive Psychology
• Neuroscience
• Sensory Integration

Background:

• Multisensory integration is crucial for perceiving events.
• Previous studies on temporal order judgments (TOJs) may have overestimated precision.
• Spatial information's role in multisensory timing is not fully understood.

Purpose of the Study:

• To investigate the influence of spatial cues on multisensory temporal order judgments.
• To examine how hand posture affects spatial processing in multisensory tasks.
• To determine if spatial redundancy benefits multisensory TOJs across different sensory pairs.

Main Methods:

• Participants performed unspeeded temporal order judgments (TOJs) with visual-tactile and auditory-visual stimuli.
• Stimuli were presented at varying onset asynchronies and spatial locations (same vs. different positions).
• Hand posture (uncrossed vs. crossed) was manipulated to assess spatial remapping.

Main Results:

• Just noticeable differences (JNDs) for TOJs were lower (higher precision) with spatially separated stimuli compared to co-located stimuli.
• This spatial redundancy benefit was reduced in a crossed-hands posture, suggesting impaired spatial remapping.
• Similar benefits were observed for auditory-visual TOJs, indicating a general principle.

Conclusions:

• Redundant spatial cues significantly enhance multisensory temporal order judgment precision.
• Hand posture critically influences the ability to utilize spatial information in multisensory perception.
• Findings suggest previous estimates of multisensory TOJ precision may be inflated; spatial and temporal perception are tightly linked.