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How time modulates spatial responses.

Antonino Vallesi1, Anthony R McIntosh, Donald T Stuss

  • 1International School for Advanced Studies, SISSA, Trieste, Italy. vallesi@sissa.it

Cortex; a Journal Devoted to the Study of the Nervous System and Behavior
|October 13, 2009
PubMed
Summary
This summary is machine-generated.

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This study shows that our perception of time, from shorter to longer durations, is represented spatially from left to right. This spatial representation influences response times and brain activity, confirming a left-to-right time perception.

Area of Science:

  • Cognitive Neuroscience
  • Psychology

Background:

  • Behavioral studies suggest time is represented spatially from left to right.
  • The neural mechanisms underlying this spatial representation of time remain unclear.

Purpose of the Study:

  • To investigate if the left-to-right representation of time elapsing leads to spatial attentional shifts.
  • To determine if this spatial representation activates corresponding left-to-right spatial response codes.

Main Methods:

  • Event-related potentials (ERPs) were measured in 14 participants.
  • Participants judged short (1 sec) vs. long (2 sec) durations with compatible (short-left, long-right) and incompatible (short-right, long-left) response mappings.

Main Results:

  • Response times were faster in compatible conditions (short-left; long-right) than incompatible conditions.

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  • ERP data revealed negativity over the right motor region for short durations (suggesting left-hand pre-activation) and over the left motor region for long durations (suggesting right-hand pre-activation) in compatible conditions.

    • Conclusions:

    • The findings confirm a left-to-right representation of elapsing time in this task.
    • This temporal-spatial representation generates response codes that impact performance and are reflected in brain activity.