Cortical synaptic inhibition declines during auditory learning

Emma C. Sarro, Gardiner von Trapp, Todd M. Mowery, Vibhakar C. Kotak, Dan Sanes

Research output: Contribution to journalArticle

Abstract

Auditory learning is associated with an enhanced representation of acoustic cues in primary auditory cortex, and modulation of inhibitory strength is causally involved in learning. If this inhibitory plasticity is associated with task learning and improvement, its expression should emerge and persist until task proficiency is achieved. We tested this idea by measuring changes to cortical inhibitory synaptic transmission as adult gerbils progressed through the process of associative learning and perceptual improvement. Using either of two procedures, aversive or appetitive conditioning, animals were trained to detect amplitude-modulated noise and then tested daily. Following each training session, a thalamocortical brain slice was generated, and inhibitory synaptic properties were recorded from layer 2/3 pyramidal neurons. Initial associative learning was accompanied by a profound reduction in the amplitude of spontaneous IPSCs (sIPSCs). However, sIPSC amplitude returned to control levels when animals reached asymptotic behavioral performance. In contrast, paired-pulse ratios decreased in trained animals as well as in control animals that experienced unpaired conditioned and unconditioned stimuli. This latter observation suggests that inhibitory release properties are modified during behavioral conditioning, even when an association between the sound and reinforcement cannot occur. These results suggest that associative learning is accompanied by a reduction of postsynaptic inhibitory strength that persists for several days during learning and perceptual improvement.

Original languageEnglish (US)
Pages (from-to)6318-6325
Number of pages8
JournalJournal of Neuroscience
Volume35
Issue number16
DOIs
StatePublished - Apr 22 2015

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Learning
Auditory Cortex
Gerbillinae
Pyramidal Cells
Inhibition (Psychology)
Acoustics
Synaptic Transmission
Cues
Noise
Observation
Brain
Conditioning (Psychology)

Keywords

  • Auditory cortex
  • E learning
  • Inhibition
  • Synaptic plasticity

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Cortical synaptic inhibition declines during auditory learning. / Sarro, Emma C.; von Trapp, Gardiner; Mowery, Todd M.; Kotak, Vibhakar C.; Sanes, Dan.

In: Journal of Neuroscience, Vol. 35, No. 16, 22.04.2015, p. 6318-6325.

Research output: Contribution to journalArticle

Sarro, Emma C. ; von Trapp, Gardiner ; Mowery, Todd M. ; Kotak, Vibhakar C. ; Sanes, Dan. / Cortical synaptic inhibition declines during auditory learning. In: Journal of Neuroscience. 2015 ; Vol. 35, No. 16. pp. 6318-6325.
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