SEPARATE REPRESENTATION OF STIMULUS FREQUENCY, INTENSITY, AND DURATION IN AUDITORY SENSORY MEMORY - AN EVENT-RELATED POTENTIAL AND DIPOLE-MODEL ANALYSIS
Mh. Giard et al., SEPARATE REPRESENTATION OF STIMULUS FREQUENCY, INTENSITY, AND DURATION IN AUDITORY SENSORY MEMORY - AN EVENT-RELATED POTENTIAL AND DIPOLE-MODEL ANALYSIS, Journal of cognitive neuroscience, 7(2), 1995, pp. 133-143
The present study analyzed the neural correlates of acoustic stimulus
representation in echoic sensory memory. The neural traces of auditory
sensory memory were indirectly studied by using the mismatch negativi
ty (MMN), an event-related potential component elicited by a change in
a repetitive sound. The MMN is assumed to reflect change detection in
a comparison process between the sensory input from a deviant stimulu
s and the neural representation of repetitive stimuli in echoic memory
. The scalp topographies of the MMNs elicited by pure tones deviating
from standard tones by either frequency, intensity, or duration varied
according to the type of stimulus deviance, indicating that the MMNs
for different attributes originate, at least in part, from distinct ne
ural populations in the auditory cortex. This result was supported by
dipole-model analysis. If the MMN generator process occurs where the s
timulus information is stored, these findings strongly suggest that th
e frequency, intensity, and duration of acoustic stimuli have a separa
te neural representation in sensory memory.