Embarrassed, but Not Depressed Megan R. Carey, Stephen G. Lisberger  Neuron  Volume 35, Issue 2, Pages 223-226 (July 2002) DOI: 10.1016/S0896-6273(02)00771-7

Figure 1 The Cerebellar Circuit for Classical Conditioning of the Eyeblink Response Sensory stimuli enter the cerebellar cortex and interpositus nucleus via mossy fibers (tone) and climbing fibers originating in the inferior olive (air puff). Note the loop created by feedback connections from the deep nucleus to the olive. Filled triangles and circles indicate excitatory and inhibitory synapses, respectively. Text boxes indicate sites of learning identified by recent experiments discussed in this minireview. Neuron 2002 35, 223-226DOI: (10.1016/S0896-6273(02)00771-7)