Gamma band plasticity in sensory cortex is a signature of the strongest memory rather than memory of the training stimulusстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 13 сентября 2017 г.
Аннотация:Gamma oscillations (30–120 Hz) are considered to be a reflection of coordinated neuronal activity,
linked to processes underlying synaptic integration and plasticity. Increases in gamma power within
the cerebral cortex have been found during many cognitive processes such as attention, learning, memory
and problem solving in both humans and animals. However, the specificity of gamma to the detailed
contents of memory remains largely unknown. We investigated the relationship between learninginduced
increased gamma power in the primary auditory cortex (A1) and the strength of memory for
acoustic frequency. Adult male rats (n = 16) received three days (200 trials each) of pairing a tone
(3.66 kHz) with stimulation of the nucleus basalis, which implanted a memory for acoustic frequency
as assessed by associatively-induced disruption of ongoing behavior, viz., respiration. Post-training frequency
generalization gradients (FGGs) revealed peaks at non-CS frequencies in 11/16 cases, likely
reflecting normal variation in pre-training acoustic experiences. A stronger relationship was found
between increased gamma power and the frequency with the strongest memory (peak of the difference
between individual post- and pre-training FGGs) vs. behavioral responses to the CS training frequency.
No such relationship was found for the theta/alpha band (4–15 Hz). These findings indicate that the
strength of specific increased neuronal synchronization within primary sensory cortical fields can determine
the specific contents of memory.