Excitatory and inhibitory synapse reorganization immediately after critical sensory experience in a vocal learner.

Abstract:

:Excitatory and inhibitory synapses are the brain's most abundant synapse types. However, little is known about their formation during critical periods of motor skill learning, when sensory experience defines a motor target that animals strive to imitate. In songbirds, we find that exposure to tutor song leads to elimination of excitatory synapses in HVC (used here as a proper name), a key song generating brain area. A similar pruning is associated with song maturation, because juvenile birds have fewer excitatory synapses, the better their song imitations. In contrast, tutoring is associated with rapid insertion of inhibitory synapses, but the tutoring-induced structural imbalance between excitation and inhibition is eliminated during subsequent song maturation. Our work suggests that sensory exposure triggers the developmental onset of goal-specific motor circuits by increasing the relative strength of inhibition and it suggests a synapse-elimination model of song memorization.

journal_name

Elife

journal_title

eLife

authors

Huang Z,Khaled HG,Kirschmann M,Gobes SM,Hahnloser RH

doi

10.7554/eLife.37571

subject

Has Abstract

pub_date

2018-10-25 00:00:00

issn

2050-084X

pii

37571

journal_volume

7

pub_type

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