Coding of stimulus strength via analog calcium signals in Purkinje cell dendrites of awake mice

Farzaneh Najafi, Andrea Giovannucci, Samuel S.H. Wang, Javier F. Medina

Research output: Contribution to journalArticlepeer-review

49 Scopus citations


The climbing fiber input to Purkinje cells acts as a teaching signal by triggering a massive influx of dendritic calcium that marks the occurrence of instructive stimuli during cerebellar learning. Here, we challenge the view that these calcium spikes are all-or-none and only signal whether the instructive stimulus has occurred, without providing parametric information about its features. We imaged ensembles of Purkinje cell dendrites in awake mice and measured their calcium responses to periocular airpuffs that serve as instructive stimuli during cerebellar-dependent eyeblink conditioning. Information about airpuff duration and pressure was encoded probabilistically across repeated trials, and in two additional signals in single trials: the synchrony of calcium spikes in the Purkinje cell population, and the amplitude of the calcium spikes, which was modulated by a non-climbing fiber pathway. These results indicate that calcium-based teaching signals in Purkinje cells contain analog information that encodes the strength of instructive stimuli trial-by-trial.

Original languageEnglish (US)
Article numbere03663
Pages (from-to)e03663
StatePublished - 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Immunology and Microbiology
  • General Biochemistry, Genetics and Molecular Biology
  • General Neuroscience


  • cerebellum
  • climbing fiber
  • motor learning
  • neural coding
  • plasticity
  • unconditioned stimulus


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