Firing rate homeostasis in visual cortex of freely behaving rodents

Keith B. Hengen, Mary E. Lambo, Stephen D. VanHooser, Donald B. Katz, Gina G. Turrigiano

Research output: Contribution to journalArticlepeer-review

233 Scopus citations

Abstract

It has been postulated that homeostatic mechanisms maintain stable circuit function by keeping neuronal firing within a set point range, but such firing rate homeostasis has never been demonstrated invivo. Here we use chronic multielectrode recordings to monitor firing rates in visual cortex of freely behaving rats during chronic monocular visual deprivation (MD). Firing rates in V1 were suppressed over the first 2day of MD but then rebounded to baseline over the next 2-3days despite continued MD. This drop and rebound in firing was accompanied by bidirectional changes in mEPSC amplitude measured exvivo. The rebound in firing was independent of sleep-wake state but was cell type specific, as putative FS and regular spiking neurons responded to MD with different time courses. These data establish that homeostatic mechanisms within the intact CNS act to stabilize neuronal firing rates in the face of sustained sensory perturbations.

Original languageEnglish
Pages (from-to)335-342
Number of pages8
JournalNeuron
Volume80
Issue number2
DOIs
StatePublished - Oct 16 2013

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