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• W2285365556 abstract "Detection of changes in the auditory environment is important for survival. The mismatch negativity (MMN) of the event-related potentials (ERPs) reflects automatic change detection that occurs independently from attention. In experimental conditions, MMN can be elicited by rare ‟deviant sounds‟, differing discernibly from the frequently occurring ‟standard sounds‟ in respect of any stimulus feature (so-called oddball condition). The generation of MMN has generally been viewed as a cortical process. The hippocampus, then again, has been thought to contribute to the detection of more salient changes, to the switching of attention to these changes and to the generation of P3a of ERPs related to the attention shift. We measured auditory cortical and hippocampal local field potentials (LFPs) to sound duration changes in urethane-anesthetized rats in an oddball condition to study whether also the hippocampus plays a role in automatic change detection and generation of MMN. As the direction of the duration deviance has been suggested to have bearing on mismatch response, we applied two conditions with duration increments as deviant sounds in one condition and duration decrements as deviant sounds in the other condition. Moreover, two conditions with different inter-stimulus intervals (ISIs of 200 and 500 ms) were applied to study how the length of the intervals between the stimuli affects mismatch response. Mismatch responses were observed both in the auditory cortex and hippocampus at 25-149.5 ms after change onset. Duration increments elicited strong mismatch responses, but mismatch responses to duration decrements were almost completely absent. Stronger mismatch responses were also elicited when ISI was 500 ms than when it was 200 ms. These results indicate that hippocampus might play a role in automatic auditory change detection and in the generation of MMN. Moreover, the findings of the effect of duration deviation direction and ISI on mismatch response are consistent with the findings of human MMN. This lends further support for the use of rats when modeling central auditory processes related to both healthy and disrupted brain functions." @default.
• W2285365556 created "2016-06-24" @default.
• W2285365556 creator A5041093567 @default.
• W2285365556 date "2013-01-01" @default.
• W2285365556 modified "2023-09-27" @default.
• W2285365556 title "Mismatch responses to sound duration changes in the rat auditory cortex and hippocampus" @default.
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