Effects of monaural versus binaural stimulation on P300 scalp topography in elderly listeners.
The P300 event-related potential was recorded from groups of young and elderly listeners in response to monaural and binaural stimulation. An oddball stimulus paradigm was used to record responses from 19 scalp locations. When listening to binaural stimuli, the young group showed midline and central P300 amplitude maxima, whereas the elderly group exhibited maximal responses in the midline and parietal regions. With monaural stimulation, the young group's responses were similar to those obtained with binaural stimulation. The elderly group, however, showed evidence of a greater contralateral hemisphere response to monaural stimulation during the early part of the P300 response. These findings support the possibility that the P300 neural generators may change with age with respect to temporal onset characteristics or their orientation and strength.
Downs
C R
CR
Department of Communication Sciences and Disorders, East Carolina University, Greenville, North Carolina 27858, USA.
Hymel
M R
MR
Cranford
J L
JL
D000328:Adult; D000367:Age Factors; D000368:Aged; D000375:Aging / Q000502:physiology*; D001301:Audiometry, Pure-Tone / Q000379:methods; D001921:Brain / Q000502:physiology; D001931:Brain Mapping; D004569:Electroencephalography; D018913:Event-Related Potentials, P300 / Q000502:physiology*; D005260:Female; D007839:Functional Laterality / Q000502:physiology; D006309:Hearing / Q000502:physiology*; D049691:History, Medieval; D006801:Humans; D008297:Male