Lisa McLaughlin

Aphantasia, the inability to generate voluntary visual images, affects an estimated 3–4% of the population and provides a valuable model for examining how the brain supports cognition without imagery. Functional MRI studies have reported diminished coordination between visual and higher-order association areas involved in imagery control. However, the temporal characteristics of these neural differences remain unclear, with electroencephalographic (EEG) evidence limited to single-case studies. Here we present the first group-level EEG investigation of aphantasia, comparing 62 individuals with the condition to 59 controls during rest and during tasks probing attention and working memory. Participants with aphantasia had smaller P300 amplitudes, an EEG index of attentional allocation and the updating of task-relevant information. Given the absence of behavioural differences between groups, this attenuation may reflect reduced engagement of imagery-related processes during attentional updating rather than diminished cognitive function. Under high working-memory load, individuals with aphantasia showed lower delta power—activity linked to regulating sensory input and maintaining internal representations. Delta power also scaled with imagery vividness, potentially indicating greater engagement of these processes in individuals with stronger imagery. This pattern suggests that aphantasics may rely more on non-visual strategies for information maintenance, thereby reducing sensory interference and demands on inhibitory control. Together, these results provide the first EEG evidence that aphantasia entails distinct but effective neural dynamics that support cognition without visual imagery.