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One person who took part in a study into aphantasia said he had started to feel "isolated" and "alone" after discovering that other people could see images in their heads. Being unable to reminisce about his mother years after her death led to him being "extremely distraught".

Adam Zeman, a professor of cognitive and behavioural neurology, wants to compare the lives and experiences of people with aphantasia and its polar-opposite hyperphantasia.His team, based at the University of Exeter, coined the term aphantasia this year

How we imagine is clearly very subjective - one person's vivid scene could be another's grainy picture.But Prof Zeman is certain that aphantasia is real. People often report being able to dream in pictures, and there have been reported cases of people losing the ability to think in images after a brain injury. He is adamant that aphantasia is "not a disorder" and says it may affect up to one in 50 people.

The reason is that the best available evidence on how the brain works shows that the brain does not deal with the kind of things that beliefs and desires are supposed to trade with: contents.

When we believe or desire, something is believed or desired: that I have bread, that it rains, that the Parliament passes the bill, etc. Beliefs and desires are about something.

. After being presented with the assassin and the crime, the book moves on to explain why, even if always wrong, narratives in general, and historical narratives in particular, are so compelling for us. Even if we have no claim to truth or correctness for our narratives, narratives seem to be highly convincing in moving us to act

Furthermore, we cannot but think in terms of them. Rosenberg's explanation for this 'addiction to stories' is that it has been entrenched in us by evolutionary processes that took place over the last million years of natural history

Narrative explanations emerged out of Darwinian processes of natural selection -- or "environmental filtration", in the less purposive parlance Rosenberg prefers -- that allowed our ancestors to coordinate efforts, collaborate and flourish, moving from the bottom to the top of the Pleistocene's food chain. Rosenberg argues that while the basic mechanisms of mindreading pervasive in the animal kingdom, based on mutual tracking and monitoring of animals' behavior, are a sound method for getting agents to coordinate behavior, these mechanisms' more recent successor, the theory of mind, crafted by the use of co-evolved languages, turned those mindreading abilities into a theory with empirical hypothesis about agents' beliefs and desires but no facts to match them.

The error historians allegedly make lies in mistaking stories for real explanations, surmising that behind our behavior there are purposes, rational motivations.

Historians -- in particular narrative historians -- make a pervasive use of folk psychological explanations, i.e., explanations that describe events in terms of the beliefs and desires of historical agents, including individuals and groups.

In order for folk psychological and historical narratives to be right there have to be facts of the matter about what sentences in such explanation refer to that make them true.

Folk psychological explanations of actions in terms of platitudes about beliefs and desires pairings evolved in natural history closely related to mind-reading mechanisms that allowed our ancestors to deal with cooperation and coordination problems.

There are no interpretative mechanisms in the brain (at any level of description) that can vindicate the attribution of contents to beliefs and desires.

There are no facts of the matter that allow us to select belief/desire pairings as those actually operating 'behind' an agent's behavior.

Folk psychological explanations do not track any facts and thus can't be correct.

Synesthesia is a neurological crossing of the senses