Comparisons of P300s from standard oddball and omitted paradigms: implications to exogenous/endogenous contributions.
OBJECTIVE
To compare the amplitude, latency, morphology, and threshold of the auditory P300 using standard oddball and omitted paradigms.


METHODS
P300 waveforms were measured from the Cz electrode site. Frequent stimuli for both paradigms were 1000 Hz tone bursts. Target stimuli for the standard oddball paradigm were 2000 Hz tone bursts and an omitted stimulus, or silent gap, for the omitted paradigm.


METHODS
Fifteen bilaterally normal-hearing young adults.


RESULTS
There were significantly lower amplitudes, poorer morphology, and higher thresholds for the P300 using an omitted paradigm compared to the standard oddball paradigm.


CONCLUSIONS
These results suggest that the auditory P300 could have a larger exogenous component than traditionally thought.
McCullagh
Jennifer
J
University of Connecticut, 850 Bolton Rd U-1085, Storrs, CT 06269, USA. Jennifer.Paulovicks@uconn.edu
Weihing
Jeffrey
J
Musiek
Frank
F
D000161:Acoustic Stimulation; D000328:Adult; D018913:Event-Related Potentials, P300 / Q000502:physiology; D005072:Evoked Potentials, Auditory / Q000502:physiology; D006801:Humans; D011930:Reaction Time; D055815:Young Adult