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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
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Evidence for visual temporal order processing below the threshold for conscious perception.

Morgane Chassignolle1, Anne Giersch2, Jennifer T Coull1

  • 1Laboratoire de Neurosciences Cognitives UMR 7291, Aix-Marseille University, CNRS, Marseille, France.

Cognition
|December 9, 2020
PubMed
Summary
This summary is machine-generated.

Even when stimuli are too close to perceive consciously, the brain processes their order. This subconscious temporal order processing helps optimize performance, suggesting hidden cognitive capabilities.

Keywords:
AttentionSimultaneitySubconsciousTemporal orderTimingVisual

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Area of Science:

  • Cognitive Neuroscience
  • Psychology
  • Human Perception

Background:

  • Discriminating event order is crucial for understanding our environment.
  • Conscious perception of event order fails for stimuli separated by less than 20-40 ms.
  • Subconscious processing of sequential events may occur below conscious thresholds.

Purpose of the Study:

  • To investigate if temporal order processing occurs below the threshold of conscious perception.
  • To provide empirical evidence for subconscious temporal order detection.

Main Methods:

  • Developed a novel paradigm using visual cues (two colored stimuli) to predict a target shape.
  • Varied stimulus onset asynchrony (SOA) to create conditions for conscious (66 ms) and subconscious (17 ms) perception.
  • Verified perception thresholds using a separate temporal order judgment task.
  • Compared reaction times to a control condition with no predictive information.

Main Results:

  • Reaction times were faster in order-cue conditions (both 66 ms and 17 ms SOAs) compared to the control.
  • Performance optimization occurred even when participants could not consciously perceive the stimuli's order.
  • Results indicate that the sequence of events was processed subconsciously.

Conclusions:

  • Temporal order processing can occur even when it falls below the threshold for conscious awareness.
  • Subconscious processing of event sequences influences behavior and optimizes performance.
  • The findings challenge the necessity of conscious perception for utilizing temporal information.