Difference between revisions of "CNP SCAP"
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+ | [http://www.ncbi.nlm.nih.gov/pubmed/16203952 Cannon et al, 2005, Archives of General Psychiatry]<br/> | ||
+ | [http://www.ncbi.nlm.nih.gov/pubmed/12679242 Glahn et al, 2003, Biological Psychiatry]<br/> | ||
+ | [http://www.ncbi.nlm.nih.gov/pubmed/12482077 Glahn et al, 2002, Neuroimage]<br/> |
Revision as of 17:53, 13 June 2011
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Contents
Basic Task Description
This task was developed in the Cannon Lab, originally by David Glahn. This behavioral version is the most basic, traditional version of the task. It differs from the LA5C SCAP version, in a few ways described below. This task has been run on most of the local Cannon Lab UCLA samples including Aftercare (first episode), CAPPS (prodromal), chronic and NF1 subjects. It has also been run in Finnish and Swedish samples.
Task Procedure
This task manipulates working memory load. The loads were selected to be of parallel difficulty, in terms of performance, to the loads in the VCAP.
Loads: 1, 3, 5 or 7 dots
There are 12 trials per load, the trials are blocked in sets of 2, and analyzed in those blocks.
Trial layout:
1. Fixation for 1sec
2. Target array for 2 sec
3. Delay period for 3 sec
4. Probe array (single dot) for 3 seconds
Each trial lasts 9 seconds. TR=3s
Text
During the SDRT, subjects were shown a target array of 1, 3, or 5 yellow circles positioned pseudorandomly around a central fixation. After a fixed delay, subjects were shown a single green circle and were required to indicate whether that circle was in the same position as one of the target circles. A relatively long stimulus presentation was used to allow subjects to fully encode the target array, minimizing a potential encoding on the basis of set size interaction. Likewise, decision or selection requirements were kept constant across set sizes to reduce possible effects of set size on response processes. Trial events included a 2-sec target-array presentation, a 3-sec delay period, and a 3-sec fixed response interval. A central fixation was visible throughout each of the 36 trials (12 per memory set size).
Glahn, 2003
Task Structure Detail
Task Schematic
Task Parameters Table
Stimuli
Dependent Variables
Cleaning Rules
Code/Algorithms
Data Distributions
References
Cannon et al, 2005, Archives of General Psychiatry
Glahn et al, 2003, Biological Psychiatry
Glahn et al, 2002, Neuroimage