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Participants observe a stimulus sequence comprising triangles and rectangles, keeping two counts, one for the triangles and one for the rectangles. Once each stimulus appears, participants update the appropriate mental count and then press a key to proceed to the next trial. Garavan’s central finding was that the reaction times signaled by the key press were longer when the incremented counter was different from the counter incremented on the previous trial (a switch trial) than when the same counter was incremented again (a no-switch trial). Garavan interpreted this switch–no-switch reaction time (RT) difference (the ‘‘switching effect’’) as an index of the time required to switch attention
from one internal counter to another, suggesting that the internal focus of attention was limited in capacity.
Definition contributed by CTorgerson about five years ago

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Symbol Counter Task has been asserted to measure the following CONCEPTS

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DISORDERS associated with Symbol Counter Task
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IMPLEMENTATIONS of Symbol Counter Task
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EXTERNAL DATASETS for Symbol Counter Task
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CONDITIONS
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Experimental conditions are the subsets of an experiment that define the relevant experimental manipulation.

CONTRASTS
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In the Cognitive Atlas, we define a contrast as any function over experimental conditions. The simplest contrast is the indicator value for a specific condition; more complex contrasts include linear or nonlinear functions of the indicator across different experimental conditions.

INDICATORS
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An indicator is a specific quantitative or qualitative variable that is recorded for analysis. These may include behavioral variables (such as response time, accuracy, or other measures of performance) or physiological variables (including genetics, psychophysiology, or brain imaging data).


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