Only minimal differences between individuals with congenital aphantasia and those with typical imagery on...

Aphantasia describes the experience of individuals who self-report a lack of voluntary visual imagery. It is not yet known whether individuals with aphantasia show deficits in cognitive and neuropsychological tasks thought to relate to aspects of visual imagery, including Spatial Span, One Touch Stocking of Cambridge, Pattern Recognition Memory, Verbal Recognition Memory and Mental Rotation. Twenty individuals with congenital aphantasia (VVIQ < 25) were identified and matched on measures of age and IQ to twenty individuals with typical imagery (VVIQ > 35). A group difference was found in the One Touch Stocking of Cambridge task for response time, but not accuracy, when the number of imagined moves that participants had to hold in their heads to complete the task increased. Similarly, a group difference in response time was apparent in the mental rotation task, but only in the subgroup of aphantasic participants who reported a severe deficit in visual imagery (VVIQ score of 16). These results suggest that the cognitive profile of people without imagery does not greatly differ from those with typical imagery when examined by group. In addition, the severity of aphantasia (and VVIQ criterion) may be an important factor to consider when investigating differences in imagery experience. Overall, this study raises questions about whether or not aphantasia represents a difference in cognitive function or in conscious experience.