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Int J Psychophysiol. 2011 Jul;81(1):60-3. doi: 10.1016/j.ijpsycho.2011.03.008. Epub 2011 Mar 31.

A novel countermeasure against the reaction time index of countermeasure use in the P300-based complex trial protocol for detection of concealed information.

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Department of Psychology, Northwestern University, Evanston, IL, USA.


A P300 deception detection protocol was tested using simultaneous versus serial countermeasures and stimulus acknowledgment responses. Previously, P300 showed recognition and elevated reaction time identified countermeasure use. Probe-irrelevant P300 differences were significant in both countermeasure groups and control group. Detection rates were 11/12 for controls, 10/12 for serial countermeasure users, and 11/13 for simultaneous countermeasure users. Reaction time detected countermeasure use in serial responders, but not simultaneous responders. The simultaneous response reaction times were indistinguishable from controls.

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