Spatial cueing in time-space synesthetes: An event-related brain potential study

Area of Science:

• Cognitive Neuroscience
• Psychology
• Neuroscience

Background:

• Time-space synesthesia involves involuntary associations between temporal events and spatial locations.
• Understanding how these associations impact cognitive functions like attention is crucial.

Purpose of the Study:

• To investigate the effect of time-space synesthetic associations on visuo-spatial attention.
• To determine if synesthetic cues influence attention differently than conventional cues.

Main Methods:

• An endogenous cuing paradigm was employed with time-space synesthetes and control participants.
• Participants performed a peripheral target detection task using arrow, word, and month name cues.
• Reaction times and event-related potentials (ERPs) were recorded.

Main Results:

• Month names served as more effective spatial attention cues for synesthetes compared to controls.
• Synesthetes showed cue validity effects on later ERP components (P3b, pSW), not early visual potentials (N1).
• These effects indicate influence on post-perceptual processing, not enhanced visual processing.

Conclusions:

• Time-space synesthesia influences the deployment of visuo-spatial attention.
• Synesthetic associations modulate post-perceptual cognitive processes like stimulus evaluation.
• The findings do not support enhanced early visual processing in time-space synesthesia.