PEBL Perceptual Vigilance Task

From PEBL WIKI
Jump to: navigation, search
Screen shot of PEBL's Perceptual Vigilance Test

Contents

About

Simple reaction time task--an circle stimulus appears at delays between 2 and 12 seconds, and the participant must depress the spacebar as quickly as possible. This is basically the simple RT task, but a version commonly used to measure sleepiness and arousal.

Notes

It follows the procedure described by Wilkinson fairly reasonably, with several exceptions.

  • As with the Wilkinson device numeric feedback is given; however unlike that device a running counter is not displayed. The presence of feedback can be controlled with the variable giveFeedback.
  • There are three different types of testing to choose from to determine whether the experiment is complete: time-based, trial-based, and block-based. These are controlled by the testType variable (1, 2, or 3)
    • Time-based will run until a certain time has elapsed
    • Trial-based will run until a specific number of trials have completed
    • Block-based allows one to use an isi-block, which gets sampled from without replacement, and then reshuffled until the number of blocks has elapsed
  • In addition, when the useContinuous variable==1, it will choose a continuous stimulus presentation time between the min and max of timeInterval. Otherwise, it will sample from the set in timeIntervals

Options

By editing script, one can specify aspects of the task: Number of trials, total test duration, isis

Data Output

Data is saved to file ppvt-<gsubnum>.txt. Columns are:

 SubjectNum, Block, Trial, ISI, absolute_Time, RT, trial_type
 for trial type, 1=too fast, 2= OK, 3 = lapse (> 500 ms) 4 = sleep (>30 s)

A summary of the results, with means and standard deviations across delays, is output to ppvt-report-<gsubnum>.txt.

References

Wilkinson, R. T., & Houghton, D. (1982). Field test of arousal: A portable reaction timer with data storage. Human Factors, 24, 487-493.

Dinges, D. F., & Powell, J. W. (1985). Microcomputer analyses of performance on a portable, simple visual RT task during sustained operations. Behavior Research Methods, Instruments, & Computers, 17, 652-655.

Research using PEBL PPVT:

Karlen, W., Cardin, S., Thalmann, D., & Floreano, D. (2010). Enhancing pilot performance with a SymBodic system. In Engineering in Medicine and Biology Society (EMBC), 2010 Annual International Conference of the IEEE (pp. 6599-6602). IEEE. http://ieeexplore.ieee.org/xpls/abs_all.jsp?arnumber=5627127

See Also

PEBL Test Battery

Personal tools
Namespaces

Variants
Actions
Navigation
Toolbox