title: Presynaptic gating of postsynaptic synaptic plasticity: a plasticity filter in the adult auditory cortex.
abstract: Sensory cortices can not only detect and analyze incoming sensory information but can also undergo plastic changes while learning behaviorally important sensory cues. This experience-dependent cortical plasticity is essential for shaping and modifying neuronal circuits to perform computations of multiple, previously unknown sensations, the adaptive process that is believed to underlie perceptual learning. Intensive efforts to identify the mechanisms of cortical plasticity have provided several important clues; however, the exact cellular sites and mechanisms within the intricate neuronal networks that underlie cortical plasticity have yet to be elucidated. In this review, we present several parallels between cortical plasticity in the auditory cortex and recently discovered mechanisms of synaptic plasticity gating at thalamocortical projections that provide the main input to sensory cortices. Striking similarities between the features and mechanisms of thalamocortical synaptic plasticity and those of experience-dependent cortical plasticity in the auditory cortex, especially in terms of regulation of an early critical period, point to thalamocortical projections as an important locus of plasticity in sensory cortices.
authors.affiliation: Department of Development Neurobiology, St. Jude Children's Research Hospital, Memphis, TN 38105-2794, USA.
authors.forename: Jay A
authors.initials: JA
authors.lastname: Blundon
authors.forename: Stanislav S
authors.initials: SS
authors.lastname: Zakharenko
mesh_terms: D000818:Animals; D001303:Auditory Cortex / Q000502:physiology*; D001307:Auditory Perception / Q000502:physiology*; D006801:Humans; D007858:Learning / Q000502:physiology; D009473:Neuronal Plasticity / Q000502:physiology*; D013569:Synapses / Q000502:physiology*; D009435:Synaptic Transmission / Q000502:physiology
keywords: adenosine; auditory cortex; perceptual memory; presynaptic; synaptic plasticity; thalamocortical synapses
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