Inside the Mind of Dementia: Do Patients Know What Is Happening?

Introduction

When the word “dementia” becomes attached to a family member or friend, an overwhelming sense of devastation often follows. Although there are various types of dementia, the general process and progression share many similarities. Dementia is an irreversible neurodegenerative brain syndrome that affects memory, thinking, comprehension, and other cognitive functions (Pergolizzi et al., 2019). The clinical nature of this form of neurocognitive decline creates significant challenges for both the affected individual and their caregiver. There are countless studies examining the complications and limitations caregivers experience when caring for a loved one with dementia; however, research provides far less exposure to the perceptions and reflections of the patients themselves. What are the thoughts of a person living with dementia? Do they know what is happening? Do they understand their condition? From the outside, memory loss and confusion may make it seem as though the person is unaware of what is occurring, but the answers are far more complex than many people realize.

Early Stages: Awareness of Cognitive Changes

Research shows that many individuals living with dementia are actually aware that their cognition has begun to change, particularly in the early stages. These changes can present as subtle shifts in memory, such as losing track of daily tasks, forgetting recent conversations or recalling familiar words. These experiences can be frustrating and sometimes frightening, as individuals begin to realize that their cognitive abilities are not functioning the way they once did. In qualitative interviews with people living with early-stage Alzheimer’s disease, participants often described a sense that something was “not quite right” in their mind, even if they couldn’t fully piece it together (Beuscher & Grando, 2009; Clare, 2003). This awareness does not remain consistent with all patients, and as dementia progresses, some gradually lose insight into their neurological condition (Orfei et al., 2008).

Emotional Awareness Often Remains

While cognitive awareness in people living with dementia often declines over time, emotional awareness frequently remains. Research has shown that even when individuals struggle to recall events or specific memories, they may still retain the emotional responses connected to those experiences (Onzo et al., 2025). For example, one study found that although patients with Alzheimer’s disease could not remember watching an emotional film, the emotional effect of the experience remained, influencing their mood even after the memory itself had faded (Guzmán-Vélez et al., 2014). Similarly, qualitative interviews suggest that individuals may respond with happiness or comfort when discussing positive memories, even if they cannot fully recall the event itself. In many cases, patients have accepted the reality of their condition and still find meaning in social connection, including meeting others living with dementia. This challenges a common public assumption that people with dementia experience only fear or emotional emptiness. Instead, research suggests their emotional lives may remain richer than many people realize.

Moments of Clarity

Some patients experience brief moments of clarity in the later stages of dementia. During these periods, individuals who typically appear disoriented or confused may abruptly recognize a loved one, express their thoughts coherently, or communicate clearly. Researchers refer to these episodes as paradoxical lucidity, a phenomenon in which individuals with severe cognitive impairment temporarily regain mental clarity (Ney et al., 2021). Although the exact neurophysiological mechanisms are not fully understood, this suggests that certain cognitive functions may remain accessible even in advanced stages of the disease (Nahm & Greyson, 2009). This is another piece of the biological mystery that continues to be explored, as it appears that cognition does not always fully let go. For families and caregivers, these moments can offer a brief glimpse of the person they once knew and serve as a reminder that aspects of awareness and identity may persist longer than many people assume.

Conclusion

Dementia is often viewed from the outside through the lens of memory loss, confusion, and cognitive decline. Because of this, it is easy to assume that individuals living with the condition are no longer aware of what is happening around them. However, research and patient interviews suggest a much more complex experience. Many individuals are aware that their thinking is changing in the early stages, retain emotional awareness even as memory begins to fade, and may even experience brief moments of clarity later in the disease. These findings challenge the common assumption that dementia completely removes a person’s awareness of their own condition.

Looking at dementia from the patient’s perspective reminds us that the experience is not only about cognitive decline. Emotions, identity, and the ability to connect with others can remain present far longer than many people expect. While dementia gradually changes the brain, it does not immediately erase the person living with it. Understanding this can help caregivers, clinicians, and even society approach dementia with more patience, empathy, and respect for the individual behind the diagnosis.

References

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Clare L. (2003). Managing threats to self: awareness in early stage Alzheimer's disease. Social science & medicine (1982), 57(6), 1017–1029. https://doi.org/10.1016/s0277-9536(02)00476-8

Nahm, M., & Greyson, B. (2009). Terminal lucidity in patients with chronic schizophrenia and dementia: a survey of the literature. The Journal of nervous and mental disease, 197(12), 942–944. https://doi.org/10.1097/NMD.0b013e3181c22583

Ney, D. B., Peterson, A., & Karlawish, J. (2021). The ethical implications of paradoxical lucidity in persons with dementia. Journal of the American Geriatrics Society, 69(12), 3617–3622. https://doi.org/10.1111/jgs.17484

Onzo, A., Nozawa, S., Ishikawa, T., Mogi, K., Oono, M., Tsuda, S., & Hotta, S. (2025). Richness of emotion in people with dementia. Biosystems, 257, 105601. https://doi.org/10.1016/j.biosystems.2025.105601

Orfei, M. D., Robinson, R. G., Bria, P., Caltagirone, C., & Spalletta, G. (2008). Unawareness of illness in neuropsychiatric disorders: phenomenological certainty versus etiopathogenic vagueness. The Neuroscientist : a review journal bringing neurobiology, neurology and psychiatry, 14(2), 203–222. https://doi.org/10.1177/1073858407309995

Pergolizzi, J., Raffa, R., Paladini, A., Varrasi, G., & LeQuang, J. (2019). Treating pain in patients with dementia and the possible concomitant relief of symptoms of agitation. Pain Management. https://doi.org/10.2217/pmt-2019-0024

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