>I am currently doing research into the statistical variability of the
>rat N40 and human P50 evoked potentials. My analysis involves looking
>at single trials, and I am wondering if anyone has any good references
Not so much to do with N40/P50, but there are several groups "down under"
working in the broader area of statistical variability of ERP components.
Anderson, J, et al (1991) "Measurement of maximum variability within event
related potentials in schizophrenia," Psychiatric Research 39:33-44
attempts to quantify variability of later "cognitive" components
Wright, J, et al (1990) "Inverse filter computation of the neural impulse
giving rise to the auditory evoked potential," Brain Topography 2:293-302
develops a model suggesting that cognitive ERP components are a simple
impulse response of an equivalent linear filter in the cortex and
suggests an explanation for variability of components in
Clark, C, et al (1991) "Event-related potentials and the spatio-temporal
dynamics of cognitive activity," J Clin & Exp Neuropsychology 13:429
uses artifical neural network techniques to quantify variability
and to recognise cognitive components in single trials
Hans Stampfer at Perth has done some nice work using the Hilbert kernel to
show that ERP variability is determined by pre-stimulus EEG variability
for single sweeps. I haven't got the citation yet (he doesn't answer his
telephone (!) but will forward this if I can. In the past I've tried using
ZFT, wavelet analysis and even the Wigner-Ville kernel to come to more or less
the same conclusions as Hans. Nothing published yet, however.
I personally think we need much more work on both single-sweep ERPs and
estimation of variability. I applaud your interest.
>I did see Dr. Barrett's posting, and I have read papers from D. G. Thomas,
>C. M. Neer, J. M. Price, and H. J. Michalewski, D. K. Prasher, A. Starr.
Would you be so kind as to either post these citations or email them to me?
Dr Alex A Sergejew, Center for Applied Neurosciences, Swinburne _--_|\
University of Technology, PO Box 218, Hawthorn, Vic 3122, Australia. / \
Internet: aas at swin.oz.au or aas at brain.physics.swin.oz.au \_.--.x/
Phone: (voice) +61-3-819 8891 (fax) +61-3-819 0856 v