Journal
CELL REPORTS
Volume 13, Issue 9, Pages 1733-1740Publisher
CELL PRESS
DOI: 10.1016/j.celrep.2015.10.060
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Funding
- Ruth L. Kirschstein National Research Service Award (NRSA) from NINDS [F32-NS-077815]
- NIH [MH103545, MH092257, EY024861]
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Exposure to repetitive startling stimuli induces habitation, a simple form of learning. Despite its simplicity, the precise cellular mechanisms by which repeated stimulation converts a robust behavioral response to behavioral indifference are unclear. Here, we use head-restrained zebrafish larvae to monitor subcellular Ca2+ dynamics in Mauthner neurons, the startle command neurons, during startle habituation in vivo. Using the Ca2+ reporter GCaMP6s, we find that the amplitude of Ca2+ signals in the lateral dendrite of the Mauthner neuron determines startle probability and that depression of this dendritic activity rather than downstream inhibition mediates glycine and N-methyl-D-aspartate (NMDA)-receptor-dependent short-term habituation. Combined, our results suggest a model for habituation learning in which increased inhibitory drive from feedforward inhibitory neurons combined with decreased excitatory input from auditory afferents decreases dendritic and Mauthner neuron excitability.
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