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Re: Solutions for sending triggers in an AEP (EEG) experiment?

Somewhat dated test results of the timing characteristics of inexpensive sound cards can be found at

For better quality cards, delays between the parallel port trigger range from 0.3-0.5 ms (mean), with a variance (time jitter) of less than 0.1 ms. This is good enough for most AEPs (except perhaps the cochlear microphonic or ABRs) provided that you correct for the mean delay.

David Woods

David L. Woods, Professor of Neurology, Dept. of Neurology,UC Davis,
Chief, Clinical Neurophysiology and Chief, Research MRI,
Neurology Service (127E), Bldg. R4, VANCHCS, 150 Muir Rd., Martinez, CA 94553
Tel (925) 372-2571, Fax (925) 229-2315 Email:dlwoods@xxxxxxxxxxx Website: http://www.ebire.org/hcnlab