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Related Experiment Video

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Working Memory Training for Older Participants: A Control Group Training Regimen and Initial Intellectual Functioning Assessment

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Working memory, attention control, and the N-back task: a question of construct validity.

Michael J Kane¹, Andrew R A Conway¹, Timothy K Miura¹

¹Department of Psychology.

Journal of Experimental Psychology. Learning, Memory, and Cognition

|May 2, 2007

Summary

The N-back task, a working memory (WM) measure, challenges attention control but shows weak correlation with other WM tasks. This suggests N-back may not fully capture the construct of working memory as previously assumed.

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Area of Science:

Cognitive Neuroscience
Psychology

Background:

The N-back task is a widely used measure of executive working memory (WM) in cognitive neuroscience.
Despite its prevalence, the construct validity of the N-back task has been minimally examined through behavioral tests.

Purpose of the Study:

To investigate the attention-control demands of verbal 2-back and 3-back tasks.
To assess the construct validity of the N-back task by examining its relationship with other working memory measures and fluid intelligence.

Main Methods:

Participants completed verbal 2-back and 3-back tasks with 'lure' foils to test attention control.
Participants also undertook a verbal WM span task (operation span) and a general fluid intelligence test (Ravens Advanced Progressive Matrices).

Main Results:

The N-back task demonstrated sensitivity to attention-control demands, with lures increasing false alarms and misses in specific conditions.
N-back performance showed only a weak correlation with the operation span task, indicating they may not measure the same construct.
Both N-back and the operation span task independently predicted variance in general fluid intelligence.

Conclusions:

The N-back task has face validity as a working memory task but lacks convergent validity with at least one established WM measure.
Findings suggest that the N-back task may tap into different cognitive processes than traditional WM span tasks.
The N-back task's sensitivity to lure foils highlights its role in challenging familiarity-based responding and attention control.