As Hamnet arrives on the big screen, many fans of the book may feel a familiar mix of excitement and trepidation. They may wonder how the film will bring to life Maggie O'Farrell’s intimate portrayal of Shakespeare’s wife, Agnes, and the loss of their son.

There is the thrill of seeing a beloved story imagined on screen. But there is also a quieter fear: that the film will not look like the version already playing in our heads.

For many of us, novels are not just read. They are seen. We carry their worlds in our “mind’s eye”, which is a phrase borrowed, fittingly, from Hamlet itself. When a film adaptation fails to match those private images, disappointment often follows. This is the moment when a viewer may find themselves thinking, or saying aloud, “that’s not how I pictured it”.

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The source of this reaction lies in the cognitive process of reading. For most readers, this involves the creation of images in the mind’s eye. We picture scenes, events and characters, however vague or vivid these mental impressions might be. Mental visualisation can form part of the pleasure of reading, immersing the reader in the novel.

We rarely stop to examine these inner images or even notice that we are........

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