L'e ́volution des idées générales

Aphantasia ( AY-fan-TAY-zhə, AF-an-TAY-zhə) is the inability to voluntarily visualize mental images. Aphantasia can be considered the opposite of hyperphantasia, the condition of having extremely vivid mental imagery. The phenomenon was first described by Francis Galton in 1880, but it has remained relatively unstudied until recently. Interest in the phenomenon was renewed after the publication of a study in 2015 by a team led by the neurologist Adam Zeman of the University of Exeter. Zeman's team coined the term aphantasia, derived from the Ancient Greek word phantasia (φαντασία), which means 'appearance/image', and the prefix a- (ἀ-), which means 'without'.