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Measuring Attention and Visual Processing Speed by Model-based Analysis of Temporal-order Judgments
Published on: January 23, 2017
Comparing perception of Stroop stimuli in focused versus divided attention paradigms: evidence for dramatic
Ami Eidels1, James T Townsend, Daniel Algom
1School of Psychology, University of Newcastle, Callaghan, NSW 2308, Australia. ami.eidels@newcastle.edu.au
Cognition
|September 8, 2009
Summary
The Stroop effect shows interference when color words match ink color. However, divided attention tasks suggest parallel processing, challenging current cognitive models.
Area of Science:
- Cognitive Psychology
- Human Attention Studies
- Perceptual Processing
Background:
- The Stroop effect demonstrates interference in focused attention tasks, where naming the ink color of a word is slower when the word itself names a different color.
- Divided attention tasks, often using redundant targets, typically show faster target detection when stimuli are repeated, suggesting processing benefits.
Purpose of the Study:
- To investigate the cognitive mechanisms underlying both the Stroop effect (focused attention) and redundant target effects (divided attention) using identical stimuli and participants.
- To reconcile seemingly contradictory findings from focused and divided attention paradigms concerning word and color processing.
Main Methods:
- Four experiments were conducted using stimuli comprising color words printed in various ink colors.
- Participants completed tasks under both focused attention (Stroop task) and divided attention (redundant targets) instructions.
- Response times for reporting ink color and target presence were recorded and analyzed.
Main Results:
- Results supported the traditional interference model for the Stroop effect, indicating slower responses when word meaning conflicts with ink color.
- Evidence also supported a non-interference, parallel processing account for the divided attention task, showing faster detection with redundant targets.
- A discrepancy was observed between the processing accounts suggested by the focused and divided attention tasks.
Conclusions:
- The study provides evidence for distinct processing mechanisms in focused versus divided attention tasks.
- The findings challenge existing cognitive theories by presenting data that supports both interference and parallel processing models.
- A unifying theoretical framework is needed to parsimoniously explain the observed phenomena across different attention conditions.
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