Specifically, brain activity began in temporal regions instead of frontal, and there was no activity in occipital (visual) cortex or parietal areas. When asked to imagine and see things in his mind, the parts of the brain that would normally be involved in creating the experience showed less activity, while other parts of the subject’s brain were active. The EEG was all within normal ranges across a battery of neuropsychological tests, except for visual imagery. In one study researchers measured the brain waves of a subject with aphantasia using electroencephalography (EEG). In individuals with aphantasia there is something about how the networks of neurons and other neural cells are wired up that makes it difficult for them to imagine or see visual imagery in their mind. None of us has actually directly ever ‘seen’ what the physical world around us looks like, we can only interpret what it might be like from the internal model our brain and mind create. It then integrates that information across different brain regions and combines information between different sensory inputs to create an internal model of the physical environment. The brain takes in information from the outside world through its five senses. There may be structural and functional changes in specific networks of neurons and other neural cells across these regions that operate differently from individuals that can produce mental imagery. These brain regions are involved in processing and integrating visual information and are thought to play a key role in the creation of mental images. A highly distributed network of brain regions, including parts of visual cortex, the temporal lobe, and the parietal lobe. There is evidence that suggests that aphantasia is the result of altered activity in different parts of the brain that process and create visual imagery and imagination. It is not entirely understood what causes aphantasia and why some individuals simply cannot see, imagine or recall mental imagery. Remembering faces is also difficult or not possible. Or events that happened to them in the past. Or they may have a very difficult time building a mental image of a description they read in a book, or from a story they hear. Beyond recall, they also lack the ability, or at least have difficulty, creating mental images or pictures.įor example, a person with aphantasia may not be able to imagine or recall something they might have seen in a movie. While each experience is unique, and no two are exactly the same, the most prominent feature is the inability to “see” or imagine anything in their mind, even when they try to recall a visual scene or object or any visual imagery at all.
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