This pause response, called a Purkinje cell CR, was also obtained when direct mossy fibre stimulation was used as the CS and direct climbing fibre stimulation as the US . Unpaired presentations of the CS and US caused extinction of the Purkinje cell CR . When paired presentations were reintroduced after extinction, Purkinje cell CRs reappeared rapidly, mirroring the " savings " phenomenon demonstrated at the behavioral level.
