Ten years ago, Perspectives in Psychological Science published the Mirror Neuron Forum, debating the role of mirror neurons in action understanding, speech, imitation and autism, and asking whether mirror neurons are acquired through visual-motor learning. Subsequent research on these themes has made significant advances, which should encourage further system-level research: Action understanding - Multivoxel pattern analysis, patient studies, and brain stimulation suggest that mirror neuron brain areas contribute to low-level processing of observed actions (e.g. distinguishing types of grip), but not to high-level action interpretation (e.g. inferring actors’ intentions). Speech perception – Although it remains unclear whether mirror neurons play a specific, causal role in speech perception, there is compelling evidence for the involvement of the motor system in the discrimination of speech in perceptually noisy conditions. Imitation – There is strong evidence from patient, brain stimulation and brain imaging studies that mirror neuron brain areas play a causal role in copying of body movement topography. Autism – Studies using behavioural and neurological measures have tried and failed to find evidence supporting the “broken mirror” theory of autism. Furthermore, research on the origin of mirror neurons has confirmed the importance of domain-general visual-motor learning, rather than canalised visual-motor learning, or motor learning alone.