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• W1976164076 endingPage "427" @default.
• W1976164076 startingPage "417" @default.
• W1976164076 abstract "The mammalian auditory system evolved to extract meaningful information from complex acoustic environments. Spectrotemporal selectivity of auditory neurons provides a potential mechanism to represent natural sounds. Experience-dependent plasticity mechanisms can remodel the spectrotemporal selectivity of neurons in primary auditory cortex (A1). Electrical stimulation of the cholinergic nucleus basalis (NB) enables plasticity in A1 that parallels natural learning and is specific to acoustic features associated with NB activity. In this study, we used NB stimulation to explore how cortical networks reorganize after experience with frequency-modulated (FM) sweeps, and how background stimuli contribute to spectrotemporal plasticity in rat auditory cortex. Pairing an 8–4 kHz FM sweep with NB stimulation 300 times per day for 20 days decreased tone thresholds, frequency selectivity, and response latency of A1 neurons in the region of the tonotopic map activated by the sound. In an attempt to modify neuronal response properties across all of A1 the same NB activation was paired in a second group of rats with five downward FM sweeps, each spanning a different octave. No changes in FM selectivity or receptive field (RF) structure were observed when the neural activation was distributed across the cortical surface. However, the addition of unpaired background sweeps of different rates or direction was sufficient to alter RF characteristics across the tonotopic map in a third group of rats. These results extend earlier observations that cortical neurons can develop stimulus specific plasticity and indicate that background conditions can strongly influence cortical plasticity" @default.
• W1976164076 created "2016-06-24" @default.
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• W1976164076 date "2004-12-23" @default.
• W1976164076 modified "2023-10-01" @default.
• W1976164076 title "Background sounds contribute to spectrotemporal plasticity in primary auditory cortex" @default.
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• W1976164076 doi "https://doi.org/10.1007/s00221-004-2098-4" @default.
• W1976164076 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2950066" @default.
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