Aphantasia
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Aphantasia: No images in your head? Learn more about mental images, imagination and their connection to long-term memory. Imagining images and memory.
Aphantasia: When mental images are missing. Visual long-term memory and imagination in the brain
Can you picture your best friend's face? The pattern on your favourite mug? The last sunset you saw? For most people, such images appear spontaneously and effortlessly in their minds. But for some, their inner visual field remains dark. No image, no colour, no outline. This experience has a name: aphantasia.
What, at first glance, seems like a curious, isolated case is now a serious field of research. Neuroscientists worldwide, including Merlin Monzel from the Institute of Psychology at the University of Bonn, are conducting intensive research into what happens differently in the brain when people are unable to generate visual images.
What it's all about:
· What aphantasia is,
· What current studies know about it, and
· What does this mean for those affected in their everyday lives?
Why imagining pictures is not just a matter of aesthetic pleasure: Visual imagination is closely linked to memory, learning and emotional processing.
Aphantasia. Description and definition: What does a lack of visual imagination mean?
The term aphantasia was coined in 2015 by British neurologist Adam Zeman. It is derived from the Greek phantasia, Aristotle's term for the mind's eye, combined with the negative prefix a–. The scientific equivalent is aphantasia. Those affected usually describe it as follows: when they try to imagine, literally nothing appears. No outline, no shadow, no visual impression. Just darkness or even a concept without any imagery.
It is important to distinguish this from general imagination: people with aphantasia do not think less or worse. They often process information conceptually or abstractly, using linguistic structures and spatial thinking skills. They even draw, compose music and write fantasy novels. The only thing missing is the visual nature of inner experience. The spectrum ranges from a complete lack of imagery (aphantasia) to extremely vivid hyperphantasia, in which inner images appear almost hallucinatory in their intensity.
Recent research has shown that other sensory modalities may also be affected: some affected individuals report being unable to imagine internal sounds, smells, or physical sensations. Others, on the other hand, have no visual images at all, while their other senses remain intact in their mental experience. This differentiation is increasingly relevant for the scientific description of the phenomenon.
Those affected and frequency: Four per cent of the population are aphantasts.
How common is aphantasia? Current estimates suggest that around four per cent of the population is affected by complete or severely limited visual imagination. In technical terms, these people are referred to as aphantasts, a term that has become increasingly widespread since its introduction in 2015. However, it is not yet used uniformly in clinical contexts.
There are interesting patterns in terms of frequency distribution: aphantasia seems to occur more frequently in scientific and technical professions than in creative or artistic ones. Researchers suspect that conceptual and abstract ways of thinking are particularly pronounced in these fields and that aphantasia is perceived as less of a disadvantage there, or is not even noticed. Those affected often only realise that their inner experience deviates from the norm through a chance conversation or an article.
Genetic factors also play a role: the probability of aphantasia is 10 times higher if a sibling reports weak or absent visual imagination. This suggests a hereditary component, even though no individual genes have been identified to date. In addition, there are cases of acquired aphantasia, for example, after brain injuries or medical procedures, which show that the ability to visualise images can also be lost in the course of a lifetime.
Imagining mental images: How does visual imagination arise in the brain?
Mental imaging, i.e. imagining visual content without external stimuli, is considered in neuroscience to be "seeing in reverse". Normally, the visual cortex receives information from the bottom up: light stimuli hit the retina, are transmitted via the thalamus to the primary visual cortex and are processed there into an image. In mental imagery, this process runs in reverse: higher brain regions, such as the prefrontal cortex and the parietal lobe, send signals back to early visual areas, where they generate an internal representation.
This model explains why mental images are qualitatively similar to visual images and why the images we imagine actually trigger activity in the primary visual cortex. Visual imagination not only supports creative thinking, but is also associated with memory consolidation, emotional regulation and planning. Imagination, combined with memory, is thus much more than a nice extra. It is a central cognitive tool.
This raises a fundamental question: what happens to people who lack this feedback loop or have it blocked? This is where modern aphasia research comes in. The discovery that the visual system also generates images in people with aphasia, but that these images do not reach consciousness, has revolutionised our understanding of mental imagery and opened new doors for consciousness research.
Brain regions and connectivity: What does magnetic resonance imaging show in aphasia?
Where exactly in the brain does aphantasia originate? Researchers use imaging techniques, particularly magnetic resonance imaging (MRI) and functional MRI (fMRI), to answer this question. These methods make it possible to visualise brain structures and activation patterns while test subjects perform mental tasks.
The findings so far are surprising: when trying to imagine something, people with aphantasia show an activation of the visual regions of the brain similar to that of people without aphantasia. The primary visual centre is therefore fundamentally active. The difference lies not in the structure of individual brain regions, but in the way they communicate with one another. Initial studies suggest that in aphantasia, the connection between higher association centres and the primary visual cortex is altered.
An insightful study by Giulia Cabbai's research group at University College London showed that when subjects heard sounds intended to elicit visual associations (such as a dog barking), neural representations were also generated in the visual cortex of people with aphantasia. This was measurable through machine learning on fMRI data. However, those affected reported not having seen any images. This suggests that unconscious visual processing is intact, but the transition to conscious experience is blocked.
University of Bonn research: Merlin Monzel, long-term memory and the eLife study
One of the most exciting current research projects on aphantasia comes from Germany: researchers at the University of Bonn's Institute of Psychology are investigating the connection between visual imagination and memory. Merlin Monzel, a psychologist at the University of Bonn, has published a study in the journal eLife that, for the first time, systematically examines how limited visual imagination affects long-term memory.
The findings of the Bonn working group are significant: people with aphantasia show noticeable changes in their autobiographical memory, i.e. in their ability to recall personal memories. While they can recall factual knowledge (semantic memory) largely normally, pictorial, experience-oriented memory is more difficult to recall. This fits with the theoretical model: if visual images are missing or weak in the construction of memories, memory content is created conceptually or linguistically rather than pictorially.
The University of Bonn is also researching whether and how these differences in long-term memory affect learning. Mental imagination, i.e. the ability to actively create and manipulate mental representations, plays a central role in how we embed new knowledge into existing structures. When visual connections are missing, the brain has to find other ways to process information. It often succeeds remarkably well, but in a qualitatively different way. Research at the University of Bonn shows that aphantasia is not a disease, but a complex phenomenon at the interface of perception, memory and consciousness.
Is aphantasia a disease? Distinction from memory disorders
Many people who learn about aphantasia first ask themselves: Am I sick? The answer from research is clear: No. Adam Zeman himself, who coined the term, firmly rejects its classification as a disease or disorder. Aphantasia is not a diagnosis and does not appear as a clinical picture in either the DSM-5 or the ICD-11.
It is important to distinguish it from conditions in which people actually suffer from memory disorders. In aphasia, memory performance is largely intact. The memory structure is different, but not worse. Retrieving information, spatial thinking and logical reasoning are also unaffected in most people with aphantasia. Differences are mainly evident in the quality of autobiographical memories and in certain aspects of emotional processing.
Aphasia only becomes therapeutically relevant when imagination-based methods are used, such as imagery rescripting in schema therapy, EMDR for trauma, or guided visualisations in relaxation therapy. People who have been blind to inner images since birth often find such techniques frustrating or useless without understanding why. The early recognition of aphantasia in a therapeutic context is therefore clinically significant because methods must be adapted accordingly.
Aphantasia and long-term memory: recalling memories and forgetting
How does aphantasia specifically affect memory? The key lies in the encoding process. This is the first phase of memory formation, in which sensory stimuli are absorbed, processed and converted into a storable form. When we store experiences, most of us use visual anchors: a scene, a face, a place. People with aphantasia cannot actively generate these visual images, which means that their memories are structured differently. They often describe the past as knowledge of facts, not as a relived experience of a scene.
This phenomenon has consequences for forgetting: without visually encoded memories, some of the memory anchors that typically help to store content in the long term are missing. The long-term memory of people with aphantasia is not generally weaker. But it works differently. Learning takes place via linguistic, conceptual or emotional channels rather than visual ones. This explains why some people with aphasia find certain learning techniques based on linguistic or structural processing particularly helpful. In contrast, classic mnemonic techniques involving internal images do not work for them.
It is also interesting to note that some people with aphantasia report experiencing forgetting differently: not as fading images, but as increasingly pale conceptual knowledge. Recalling memories works differently when no visual representation can be retrieved. (The Bonn study by Merlin Monzel provides important empirical foundations here that help to anchor these subjective reports scientifically, see above.)
Limited visual imagination: Can this ability be trained?
One of the most common questions asked by those affected is: Can aphantasia be overcome? Can the ability to create mental images be trained? The honest answer: Research in this area is still in its infancy. There are no proven methods that can reliably "cure" aphantasia. And given that it is not a disease, this is not necessarily a research goal.
However, science shows that the brain has great potential for plasticity. Some reports suggest that targeted exercises can slightly increase the vividness of internal perceptions, but without creating complete visual imagination. Interestingly, some affected individuals report having vivid dreams, even though they cannot imagine images while awake. This shows that the brain structures for visual representation are present in principle, but do not receive conscious access while awake.
For everyday life, this means that the ability to visualise mentally may not be trainable like a muscle, but one can learn to be more conscious of one's own cognition. Those who understand how their brain processes information, whether pictorial, linguistic or conceptual, can make learning and memory more targeted.
Aphantasia and consciousness: what the "mind's eye" reveals about the brain
Aphantasia has proven to be a surprising window into the study of consciousness. The key finding: the visual system also generates neural images in people with aphantasia. However, these images do not penetrate conscious experience. This blockage raises fundamental questions: what exactly makes neural activity conscious? Where is the threshold between unconscious processing and conscious images?
Researchers are increasingly discussing whether aphantasia is a problem of top-down signalling, i.e. the ability of higher brain regions to generate targeted activity in early visual areas. Or whether it is due to the conscious accessibility of existing images. Both explanations would have consequences for competing theories of consciousness. The fact that some people with aphantasia dream and experience images suggests that the system functions differently during sleep, when frontal lobe control mechanisms are reduced, than when awake.
This calls for modesty in treatment: what seems natural to the therapist – imagining a scene, constructing an inner image, "playing back" a memory visually – may simply be inaccessible to those affected. Aphantasia is an invitation to take the diversity of mental experience seriously.
Aphantasia in everyday life: learning, creativity and visual thinking
In everyday life, aphantasia often goes undetected for decades. Many affected individuals only realise that their inner experience is unusual when someone else points it out. By then, they have developed their own strategies: memory anchors based on language rather than images, learning through repetition rather than visualisation, and creativity through conceptual idea development rather than inner imagery. The amazing thing is how well this usually works.
This is particularly impressive in creative professions: writers with aphasia say that they describe characters and worlds without ever "seeing" them. Architects construct spatial structures through logical reasoning. People who learn about their aphantasia in therapy often report a deep sense of relief: finally, the frustration with meditation exercises, visualisation instructions or image-based learning has a name. Aphantasia does not mean thinking less; it means thinking differently.
Visual imagination is helpful in many areas of life, but it is not a universal measure of mental ability. People with aphantasia are proof that when visual imagination is limited, the brain finds creative and highly functional ways to process, remember and create the world. Growing research, not least from Bonn and other international centres, confirms that what was once invisible is now becoming a source of important insights into memory, perception and human consciousness.
The most important thing
· Aphantasia is the complete or severely limited absence of visual imagination. Those affected do not see inner images when they think.
· An estimated four per cent of people are affected; they are referred to in technical terms as aphantasts.
· Aphantasia is not a disease or a memory disorder; it is a neurocognitive variation with a genetic basis.
· Even in people with aphantasia, the brain generates visual representations, but these do not reach consciousness. This has been shown by MRI and fMRI studies.
· Researchers at the University of Bonn (including Merlin Monzel, published in eLife) are investigating the influence on long-term memory and the retrieval of autobiographical memories.
· Long-term memory functions differently in people with aphantasia: memories are stored conceptually rather than pictorially, with advantages and disadvantages for learning.
· Imagining pictures is closely linked to memory consolidation and emotional processing. In aphantasia, linguistic and conceptual processes take over this function.
· In psychotherapy, image-based techniques (EMDR, imagery rescripting, visualisations) should be identified and adapted for aphasia.
· Training this ability is possible to a limited extent, but aphantasia does not limit overall intelligence or creativity.
· Aphantasia often remains undetected for decades because those affected have no basis for comparison and never consider that other people can actually see internal images.
Sources: Zeman et al. (2015), Cortex; Cabbai et al. (2024), Current Biology; Monzel et al., eLife; Pearson (2019), Nature Reviews Neuroscience; Quill (2026), Nature. This article is intended for psychological education and does not replace individual psychotherapeutic counselling.
Frequently asked questions (FAQ)
What is the difference between aphantasia and hyperphantasia?
Aphantasia and hyperphantasia describe the two extremes on the spectrum of mental imagery. In aphantasia, the ability to form mental images is severely limited or completely absent. Those affected see no inner images when their eyes are closed, even when they actively try. The description of those affected often sounds like this: the inner field of vision remains dark or empty, while thoughts are purely conceptual or linguistic.
Hyperphantasie is the exact opposite: people with hyperphantasie experience vivid, highly detailed inner images. These images are so vivid that the boundaries between imagination and actual perception can become blurred. What can be imagined appears almost like a real visual experience. Neither condition is considered a disorder, but rather a neurocognitive variation with a prevalence of about 1% (aphasia in its extreme form) and about 3% (hyperphantasia in its extreme form) in the population. There are numerous gradations between these two extremes. Most people fall somewhere in the middle of the spectrum.
What are the symptoms of hyperphantasia?
Hyperphantasia manifests itself primarily through unusually vivid and detailed mental images. Those affected describe being able to imagine objects, scenes, or faces with almost photographic quality, as clearly as if they were actually seeing them. This intensity can be a source of joy, but it can also be stressful. When negative thoughts or distressing memories impose themselves vividly and uncontrollably, hyperphantasie can be linked to mood disorders such as anxiety, depression or obsessive thoughts. The research hypothesis is that vivid imagination does not cause these conditions; rather, it can increase their intensity.
In everyday life, hyperfantasy often manifests as a particular strength in creative professions: design, visual arts, acting, writing, and all activities that require visual imagination and a detailed internalisation of scenarios. People with hyperfantasy often report reading books as if they were watching films. Every scene appears to them as a vivid internal image. It is important to distinguish this from pathological conditions such as hallucinations: people with hyperfantasy know that the images come from within. They do not lose touch with reality.
Is hyperphantasia hereditary? And does this also apply to aphantasia?
Yes, there is evidence of a genetic component for both variants. Studies show that aphantasia and hyperphantasia "run in families," i.e., they occur more frequently in some families than in others. The likelihood of having aphantasia increases significantly if a sibling also reports having a weak or nonexistent visual imagination. The same applies to hyperphantasia. This suggests a hereditary basis, even though no specific genes have been identified to date.
At the same time, there are acquired forms: aphantasia can occur after brain injuries, strokes or certain medical procedures, as shown by the first clinically documented case of Adam Zeman in 2003. This means that the predisposition for mental imagery is at least partially neurobiologically anchored and can be influenced by changes in the brain. Researchers, including those at the University of Bonn, are actively working further to elucidate the exact neurobiological basis of both extreme variants.
Is aphantasia a form of autism?
No. Aphasia is not a form of autism and is not a diagnostic category in the clinical sense. It is a neurocognitive variation that affects inner experience but does not coincide with social communication profiles, stimulus processing or other core characteristics of the autism spectrum. However, studies show that both aphantasia and hyperphantasia can occur in people on the autism spectrum, which further underscores the diversity of cognitive profiles in autism, but does not establish a direct connection.
Aphasia is increasingly understood by researchers as part of the "range of neural diversity," a term coined by neuroscientist Joel Pearson of the University of New South Wales. It is not a question of whether someone thinks "normally," but rather that people can have fundamentally different cognitive styles. Those who do not see inner images do not think less; they think differently.
Is aphantasia a response to trauma?
In most cases, aphantasia is congenital and not caused by trauma. In this most common form, those affected are unable to generate visual images from birth, without any triggering factor. These people often report that they could never imagine another way of thinking because they never knew any other.
However, there is also psychogenically acquired aphantasia, in which the absence of mental images is interpreted as a possible reaction to traumatic experiences. In such cases, suppressing visual memories can act as a protective mechanism, similar to dissociative phenomena after trauma. This form is rarer and differs significantly from congenital aphantasia in its neurobiological basis and clinical significance. Anyone who suspects that their limited visual imagination may be related to traumatic experiences should discuss this in a psychotherapeutic context.
Is aphantasia a form of neurodivergence?
Aphantasia is increasingly considered part of the neural diversity of the human brain. In a broad sense, it is therefore neurodivergent. Unlike classic neurodivergence terms such as ADHD or autism spectrum disorder, however, aphantasia does not have its own diagnostic category and is not considered a disorder. Rather, it describes a specific variation in the way the brain generates and accesses internal representations.
The aphantasia community has coined the term "image-free thinking," a phrase that describes the experience without pathologising it. For many affected individuals, the discovery that their thinking works differently is an enlightening and identity-strengthening realisation. It explains why certain techniques, from relaxation visualisations to pictorial learning techniques, have never worked, and opens up new ways of dealing with one's own mind.
Are people with aphantasia better at certain things?
In fact, studies show some interesting strengths: people with aphantasia are often described as particularly good at analytical and abstract-logical thinking. Since they do not rely on visual memory anchors, they often develop strong skills in linguistic, conceptual and structured processing. Some studies also suggest that aphantastics may even be slightly superior to people with very vivid imaginations (hyperphantasy) in certain tests of abstract reasoning.
At the same time, it should be emphasised that there is no general cognitive superiority or inferiority. Aphasia is neither an advantage nor a disadvantage; it is simply a different way of processing the world mentally. Well-known personalities such as Glen Keane, the animator behind Ariel, Tarzan and Sleeping Beauty, and Ed Catmull, co-founder of Pixar, have aphantasia. They impressively demonstrate how creative excellence is possible even without internal images.
Is hyperphantasia linked to autism or other mental conditions?
Like aphantasia, hyperphantasia can occur in people on the autism spectrum, but it is neither a cause nor a characteristic of autism. The connection is statistical, not causal: both variants of mental imagery occur more frequently in the neurodivergent population than in the average population, which could indicate common neurobiological factors.
The link between hyperphantasia and mood disorders has been studied more extensively: vivid, uncontrollable inner images can intensify anxiety and depressive rumination, not because the imagination is pathological, but because it intensifies the emotional content of negative thoughts. There is also a debated but not yet conclusively clarified connection to certain psychosis spectrum characteristics: a reduction in the primary visual cortex has been described in schizophrenia, and similar structural changes are also being discussed for hyperfantasy. There is still a considerable need for research in this area, and it would be premature to describe hyperfantasy as a risk marker for psychosis.
How does a person with aphantasia think?
This is one of the most common and fascinating questions people ask when they learn about aphantasia. The answer: differently, but not worse. People with aphantasia think predominantly in language, concepts, abstract structures and sometimes in spatial or mathematical patterns, but without accompanying inner images. When they think of a dog, a concept, a piece of knowledge or an association comes to mind, but no image.
Many affected individuals describe reading books differently: without an inner cinema, but not without engagement or understanding. Memories feel less like reliving and more like knowing that something happened. That sounds like a loss, but it is not necessarily so. It is a distinct cognitive style with its own strengths, which many affected individuals only come to appreciate once they understand what it entails.
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