Human beings often make frequent hand movements whilst they are talking. There has been considerable psychological debate about their function, but it is now clear that they often convey core parts of the underlying message. Since we have little conscious awareness of these movements, they can be particularly revealing. We control what we say, but find it difficult, or impossible, to control the content and form of these movements. Their form and 'meaning' may not match the accompanying speech and these gesture-speech mismatches can indicate various underlying psychological states, including deception. I will argue for the essential unity of speech and gesture in the transmission of thought, and suggest that we have underestimated the considerable communicative significance of these movements.The transcript and downloadable versions of the lecture are available from the Gresham College website: https://www.gresham.ac.uk/lectures-and-events/how-spontaneous-gestures-connect-to-thinkingGresham College has been giving free public lectures since 1597. This tradition continues today with all of our five or so public lectures a week being made available for free download from our website. There are currently over 2,000 lectures free to access or download from the website.Website: http://www.gresham.ac.uk Twitter: http://twitter.com/GreshamCollege Facebook: https://www.facebook.com/greshamcollege Instagram: http://www.instagram.com/greshamcollegeSupport the show

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