Abstract
Congenital aphantasia is a recently identified experience defined by the inability to form voluntary visual imagery, with intact semantic memory and vision. Although understanding aphantasia promises insights into the nature of visual imagery, as a new focus of study, research is limited and has largely focused on small samples and subjective report. The current large-scale online study of aphantasics (N=63) and controls required participants to draw real-world scenes from memory, and copy them during a matched perceptual condition. Drawings were objectively quantified by 2,700 online scorers for object and spatial details. Aphantasics recalled significantly fewer object details than controls, and showed a reliance on verbal strategies. However, aphantasics showed equally high spatial accuracy as controls, and made significantly fewer memory errors, with no differences between groups in the perceptual condition. This object-specific memory impairment in aphantasics provides evidence for separate systems in memory that support object versus spatial details.