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Relational Dynamics in Perception: Impacts on Trial-to-trial Variation
1Network Biology Research Laboratories, Technion - Israel Institute of Technology Haifa, Israel.
Frontiers in Computational Neuroscience
|June 8, 2011
Summary
Trial-to-trial variability in visual detection is reduced when stimulus contrast matches judgment fluctuations. This suggests a high-level cognitive process, not a change in basic perception, underlies detection variability.
Area of Science:
- Cognitive Neuroscience
- Visual Perception
- Psychophysics
Background:
- Trial-to-trial variability is a key feature of sensory detection tasks.
- Understanding the mechanisms of this variability is crucial for cognitive science.
Purpose of the Study:
- To investigate the role of stimulus-contrast fluctuations in modulating sensory detection variability.
- To determine if variability reduction impacts the underlying psychometric function.
Main Methods:
- Subjects performed a visual stimulus detection task.
- Stimulus contrast was dynamically adjusted to match fluctuations in subject judgments.
- Psychometric functions were analyzed before and during the adaptive contrast manipulation.
Main Results:
- Trial-to-trial variability in detection was significantly diminished under adaptive contrast conditions.
- This reduction in variability did not alter the subject's psychometric function.
- The findings suggest a top-down cognitive control mechanism rather than a bottom-up sensory change.
Conclusions:
- Sensory detection variability is not solely determined by stimulus properties but is influenced by higher-level cognitive control.
- The brain may actively regulate detection performance through dynamic adjustments, possibly related to exploring subject-object relationships.
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