Somatosensory mismatch response in young and elderly adults
Strömmer, J., Tarkka, I., & Astikainen, P. (2014). Somatosensory mismatch response in young and elderly adults. Frontiers in Aging Neuroscience, 6(October), Article 293. https://doi.org/10.3389/fnagi.2014.00293
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Frontiers in Aging NeuroscienceDate
2014Copyright
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Aging is associated with cognitive decline and alterations in early perceptual processes.
Studies in the auditory and visual sensory modalities have shown that the mismatch
negativity [or the mismatch response (MMR)], an event-related potential (ERP) elicited
by a deviant stimulus in a background of homogenous events, diminishes with aging and
cognitive decline. However, the effects of aging on the somatosensory MMR (sMMR) are
not known. In the current study, we recorded ERPs to electrical pulses to different fingers
of the left hand in a passive oddball experiment in young (22–36 years) and elderly (66–
95 years) adults engaged in a visual task. The MMR was found to deviants as compared to
standards at two latency ranges: 180–220 ms and 250–290 ms post-stimulus onset. At 180–
220 ms, within the young, the MMR was found at medial electrode sites, whereas aged
did not show any amplitude difference between the stimulus types at the same latency
range. At 250–290 ms, the MMR was evident with attenuated amplitude and narrowed
scalp distribution among aged (Fz) compared to young (fronto-centrally and lateral parietal
sites). Hence, the results reveal that the somatosensory change detection mechanism is
altered in aging. The sMMR can be used as a reliable measure of age-related changes in
sensory-cognitive functions.
...
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