A typically-forgotten part of the new physiology of the echo neuron system is the current presence of backward connections regarding PM so you’re able to STS, hence appear to have an internet inhibitory dictate [55,56]. From a Hebbian views, of these relationships the issue is a little various other, as the PM neurons actually fire prior to the STS neurons, because the Hebbian studying requires, albeit two hundred ms rather than the 40 ms prior which might be optimal to possess Hebbian studying. And therefore, for these inhibitory viewpoints associations, inhibitory projections from PM neurons encoding a particular phase of the action will likely be bolstered having STS representations of the same action and therefore occurring just before ( figure step 3 c).
The newest sight and you may sound out of an action leads to craft inside STS neurons
Once we consider both the forward and backwards information flow, the mirror neuron system no longer seems a simple associative system in which the sight of a given action triggers the motor representation of that action. This leads to a pattern of predictive activation of PM neurons encoding the action that occurs 200 ms after what the STS neurons represent, with their respective activation levels representing the likelihood of their occurrence based on past sensorimotor contingencies. However, the system would not stop at that point. This prediction in PM neurons is sent backwards as an inhibitory signal to STS neurons. Read more