If they react reflexively, it communicates all sorts of things. It's not a traditional conversation, and there may not be bidirectional communication, but information is still being communicated.
No, a reflex action is not communication. You can hit someone’s knee and it produces a response. The knee isn’t communicating with you, it’s reacting to a stimuli.
No, a reflex action is not communication. You can hit someone’s knee and it produces a response. The knee isn’t communicating with you, it’s reacting to a stimuli.