The human brain comes under dramatic scrutiny for the second time this year. Where Nick Payne's Incognito examined the sense of self this looks at memory and people with a condition called synaesthesia.

Directed by Peter Brook and Marie-Hélène Estienne, it's based on real neurological experiments on synaesthetes who's sensory pathways work in union.  For example when they see letters they become images or sounds become colours.

Kathryn Hunter plays Sammy Costas who can easily memorise lists of random words or numbers with the aid of her synaethesia.

The format feels like a dramatic lecture. It is full of interesting information but whereas Incognito had its feet firmly in the drama camp with a rooted narrative and human experience, this feels like a lecture with bits acted out.