[Aphantasia: A Cognitive Condition Characterized by the Absence of Voluntary Mental Imagery].

"Aphantasia" refers to the inability to create voluntary mental images. Most studies have assessed aphantasia using questionnaires; however, recently, there have been attempts to quantify aphantasia using objective measures such as pupillary reflexes and electrodermal responses. Currently, no treatment has been established, and there are many unknown aspects of brain function. Conversely, compensatory measures such as language function may likely minimize the mental distress and disruption in the lives of individuals with aphantasia.