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[[File:Pcpt-1.gif|thumb|Screen shot of PEBL's Continuous Performance Test]] ==About== The pcpt directory of the test battery offers two related continuous performance tasks. The pcpt.pbl task is a faithful implementation of Conners's Continuous Performance task (CCPT). A constant series of letter stimuli appear on the screen; participant must respond to all stimuli EXCEPT the X. The pcpt-ax.pbl is an implementation of the CPT-AX task, modeled after one used by Lee and Park (2006). In this task a response is made ONLY when X follows A. This is a vigilance task, which takes approx 14 minutes to complete. 360 letters approx 1 inch in size are presented one at a time. Participant must respond by pressing the space bar to all stimuli except the X. ==Notes== Located in battery/pcpt/pcpt.pbl x ==Options: PCPT== The default parameters reflect the Connors task faithfully. *''testtype'' (Default=1) Type of test. Currently, only type 1 is implemented. *''cycles'' (Default=6). Total number of blocks. cyclesxblocksize is the number of trials *''blocksize'' (Default=20). Number of trials per block *''prestime'' (Default=250). Presentation time of stimuli *''targprob'' (Default=0.1). Probability of an 'x' target being presented *''givefeedback'' (Default=0). Give text-based feedback about *''pausebetweenblocks'' (Default=0). Whether a pause should occur between each ISI block *''proportionalfoil'' (Default=1). if set to 1, will use exactly 1-targprob foils; if set to 0, will generate a foil with 1-targfoil probability on each trial ==Options: pcpt-ax== *''cycles'' (Default=6) Total number of blocks. cyclesxblocksize is the number of trials *''blocksize'' (Default=20) Number of trials per block *''isi'' (Default=5000) Time between stimuli *''prestime'' (Default=250) Presentation time of stimuli *''axprob'' (Default=0.7) probability of a AX trial. *''bxprob'' (Default=0.1) probability of a BX trial *''ayprob'' (Default=0.1) probability of a AY trial *''byprob'' (Default=0.1) probability of a BY trial *''givefeedback'' (Default=0) Whether to give error feedback *''pausebetweenblocks'' (Default=0) should they pause between blocks of trials? ==Data Output== Detailed data is stored in data/subnum/ptpt-subnum.csv, and pooled across subjects in data/pooled-pcpt.csv. Detailed summary report is in data/subnum/pcpt-report-subnum.txt. This contains a number of summary statistics broken down across ISI. For cpt-ax, identical files named pcpt-ax are saved. ==References== C. Keith Conners, Jeffery N. Epstein, Adrian Angold, John Klaric (2003) Continuous performance test performance in a normative epidemiological sample Journal of Abnormal Child Psychology, * Lee, J. & Park, S. (2006). The role of stimulus saliance in CPT-AX performance of schizophrenia patients. Schizophrenia research, 81, 191-197. * http://www.vanderbilt.edu/parklab/Lee_Park_CPT_2006.pdf ==See Also== [[PEBL Test Battery]] *http://en.wikipedia.org/wiki/Continuous_Performance_Task [[TOAV: Test of Attentional Vigilance]] [[Category:Battery Tests]]
PEBL Continuous Performance Test
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