nod that's probably the most sensible response.

To help others understand the potential risks, the creation of a 'tulpa' appears to involve hacking the way your sense-of-self (what current neuroscience identifies as a function of the right inferior parietal cortex) interacts with your ability to empathize and emulate other people (the so-called mirror neuron / "put yourself in others' shoes" modules). Failure modes involve symptoms that mimic dissociative identity disorder, social anxiety disorder, and schizophrenia.