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Related Experiment Video

Updated: Apr 16, 2026

A Dual Task Procedure Combined with Rapid Serial Visual Presentation to Test Attentional Blink for Nontargets

A Dual Task Procedure Combined with Rapid Serial Visual Presentation to Test Attentional Blink for Nontargets

Published on: December 5, 2014

Attentional switches and dual-task interference.

Janne F Ettwig¹, Adelbert W Bronkhorst¹

¹Vrije Universiteit, Amsterdam, The Netherlands; TNO, Soesterberg, The Netherlands.

|March 3, 2015

Summary

Attentional switching, not resource competition, explains dual-task interference. Difficulty disengaging attention from a visual search task prolonged interference with a subsequent letter identification task.

Area of Science:

Cognitive Psychology
Neuroscience
Human Factors

Background:

Dual-task performance is often explained by resource competition.
Understanding attentional dynamics is crucial for optimizing task performance.

Purpose of the Study:

To investigate the time course and underlying mechanisms of interference in dual-task scenarios.
To differentiate between resource competition and attentional switching as sources of dual-task interference.

Main Methods:

Four experiments examined dual-task performance comparing single-task baselines.
Temporal lags and spatial distances between an oddball orientation target (OT) and a letter target (LT) were manipulated.
Target durations and masking were varied to assess attentional disengagement.

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Main Results:

Interference was stronger and longer-lasting when the visual search task (OT) preceded the letter identification task (LT).
Results contradicted simple resource competition models.
Evidence supported attentional disengagement difficulty from the search display as the primary cause of interference.

Conclusions:

Attentional switching costs significantly contribute to dual-task interference.
Difficulty in disengaging attention from a primary task can impede performance on a secondary task.
Attentional effects can mask or outweigh resource competition in dual-task settings.