In general, these data indicate that synesthesia can be induced after only minutes of visual deprivation, too short a period for the cross-activation model to account for, and more consistent with disinhibited-feedback models.

Can you give yourself synesthesia?

Yes, You Can Teach Yourself Synesthesia (And Here's Why You Should) A synesthete-turned-scientist on why it's helpful to “hear” colors and “see” sounds. Berit Brogaard has had synesthesia, a neurological condition in which different senses combine in unusual ways, for as long as she can remember.

Can synesthesia be triggered?

Synesthesia is both involuntary but elicited (Cytowic, 1996) and irrepressible. That means, the synesthete does not have to trigger the second sensory experience consciously; it happens on its own as a response to a stimuli, i.e. it is also elicited.