Aphantasia
Inability to picture something in one's mind / From Wikipedia, the free encyclopedia
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Aphantasia (/ˌeɪfænˈteɪʒə/ AY-fan-TAY-zhə, /ˌæfænˈteɪʒə/ AF-an-TAY-zhə) is the inability to create mental imagery.[1]
The phenomenon was first described by Francis Galton in 1880,[2] but has remained relatively unstudied. Interest in the phenomenon renewed after the publication of a study in 2015 conducted by a team led by Adam Zeman of the University of Exeter.[3] Zeman's team coined the term aphantasia,[4] derived from the ancient Greek word phantasia (φαντασία), which means "appearance/image", and the prefix a- (ἀ-), which means "without".[5] People with aphantasia are called aphantasics,[6] or less commonly aphants[7] or aphantasiacs.[8]
Aphantasia can be considered the opposite of hyperphantasia, the condition of having extremely vivid mental imagery.[9][10]