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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
Published on: January 23, 2017
Time-locked association between rapid cerebral blood flow modulation and attentional performance
S Duschek1, D Schuepbach, R Schandry
1University of Munich, Department of Psychology, Leopoldstrasse 13, 80802 München, Germany. duschek@psy.uni-muenchen.de
Summary
Rapid changes in cerebral blood flow, specifically within seconds 2 and 3 of a warning signal, are linked to attentional performance. This early hemodynamic response significantly correlates with reaction times in healthy adults.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Physiology
Background:
- Complex cognitive functions rely on efficient cerebral hemodynamic modulation.
- Previous research suggests a link between early hemodynamic responses and cognitive performance.
Purpose of the Study:
- To investigate the relationship between rapid cerebral hemodynamic changes and attentional performance.
- To test the hypothesis that the initial seconds of the hemodynamic response are critical for cognitive functioning.
Main Methods:
- Transcranial Doppler sonography measured middle cerebral artery blood flow velocities in 48 healthy participants.
- Participants performed a reaction time task with a visual stimulus preceded by an acoustic warning signal.
- Task-induced hemodynamic changes were analyzed second-by-second and correlated with reaction time.
Main Results:
- A right-dominant cerebral blood flow response was observed.
- Increased blood flow velocity in seconds 2 and 3 post-cueing significantly correlated with faster reaction times.
- Early (first second) and late components of the hemodynamic response did not show a significant correlation with performance.
Conclusions:
- A time-locked association exists between early cerebral blood flow increases and attentional performance.
- This finding aligns with neurophysiological data indicating a close link between brain perfusion and cortical activity within a specific early time window.
- The study supports the existence of a critical early interval where cerebral hemodynamics and behavior are closely related.
