The Psychophysics of Workload — A Second Look at the Relationship between Subjective Measures and Performance

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Abstract
Load estimates based upon subjective and performance indices were compared for subjects performing size matching and letter typing tasks under 6 levels of priorities, in single and dual task conditions. Each half of the group used a different task as reference in their subjecitve judgement. The results are interpreted to indicate that subjective measures are especially sensitive to voluntary allocation of attention and to the load on working memory. Association with performance is expected whenever these two factors are main determinants of peformance efficiency, otherwise the two are likely to dissociate.

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