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Locus of the single-channel bottleneck in dual-task interferenceTwo experiments used the locus-of-cognitive-slack method to determine whether dual-task interference occurs before or after the response selection stage. The experiments used the overlapping tasks paradigm, in which two signals, each requiring a different speeded choice response, are presented in rapid succession. In Experiment 1, stimulus-response (S-R) compatibility was manipulated by varying whether Task 2 stimuli were mapped onto their responses by a rule or arbitrarily. Compatibility effects were additive with the effects of degree of task overlap, manipulated by varying the stimulus onset asynchrony between the signals. Experiment 2 examined 2 additional forms of S-R compatibility: symbolic compatability (arrows vs. letters) and spatial compatibility (the 'Simon' effect). Effects of symbolic compatibility were additive with effects of degree of task overlap, whereas the effects of spatial compatibility and degree of task overlap were underadditive. It is argued that only a central-bottleneck model provides a consistent account of these results. The nature of the central bottleneck is considered.
Document ID
19930030101
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Mccann, Robert S.
(Sterling Federal Systems, Inc. Palo Alto, CA, United States)
Johnston, James C.
(NASA Ames Research Center Moffett Field, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1992
Publication Information
Publication: Journal of Experimental Psychology: Human Perception and Performance
Volume: 18
Issue: 2
ISSN: 0096-1523
Subject Category
Behavioral Sciences
Accession Number
93A14098
Funding Number(s)
CONTRACT_GRANT: NCA2-225
Distribution Limits
Public
Copyright
Other

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