Abstract
Aphantasia and prosopagnosia are both rare conditions with impairments in visual cognition. While prosopagnosia refers to a face recognition deficit, aphantasics exhibit a lack of mental imagery. Current object recognition theories propose an interplay of perception and mental representations, making an association between recognition performance and visual imagery plausible. While the literature assumes a link between aphantasia and prosopagnosia, other impairments in aphantasia have been shown to be rather global. Therefore, we assumed that aphantasics do not solely exhibit impairments in face recognition but rather in general visual recognition performance, probably moderated by stimulus complexity. To test this hypothesis, 65 aphantasics were compared to 55 controls in a face recognition task, the Cambridge Face Memory Test, and a corresponding object recognition task, the Cambridge Car Memory Test. In both tasks, aphantasics performed worse than controls, indicating mild recognition deficits without face-specificity. Additional correlations between imagery vividness and performance in both tasks were found, suggesting that visual imagery influences visual recognition not only in imagery extremes. Stimulus complexity produced the expected moderation effect but only for the whole imagery-spectrum and only with face stimuli. Overall, the results imply that aphantasia is linked to a general but mild deficit in visual recognition.
What This Study Is About
Researchers wanted to know if people who can’t "see" things in their mind also struggle to recognize faces, or if they have a slightly harder time recognizing objects in general.
How They Studied It
The team looked at 65 people with aphantasia—the inability to create mental imagery (the "mind's eye" or the ability to picture things in your head). They compared them to 55 "controls" (people with typical imagery).
Participants took two main digital tests:
1. The Cambridge Face Memory Test: Learning and then picking out specific faces from a lineup.
2. The Cambridge Car Memory Test: The same task, but using different types of cars to see if recognition issues were specific to faces or applied to objects, too.
What They Found
The researchers discovered that people with aphantasia were slightly less accurate at recognizing both faces and cars compared to the control group. However, they were not significantly more likely to have "face blindness" (a condition called prosopagnosia).
In fact, only 3% of the aphantasic group met the criteria for face blindness. The study found that while people with aphantasia are a little less accurate, the difference is small. Interestingly, the more vivid a person's mental imagery was, the better they performed on the face tests, especially when the images were "noisy" or blurry.
What This Might Mean
This suggests that being able to "picture" a face in your head is like having a helpful backup tool for recognition, but it isn't the only tool our brains use. People with aphantasia likely use different strategies—like remembering specific features rather than a whole "mental photo"—to recognize people and things.
Because this was an online study and only used cars as the "non-face" object, we can't be 100% certain this applies to every object in the world. It suggests that aphantasia comes with a very mild, general difference in how we recognize the world, rather than a specific problem with faces.
One Interesting Detail
The study found that mental imagery acts like a "booster" for recognition: as the faces became harder to see (like having static on a TV screen), people with vivid imagery used their "mind's eye" to fill in the gaps, while those with aphantasia had to rely purely on what was right in front of them!