The synthesis draws on two complementary reviews. The first examined empirical associations between pain and cognition in people with dementia and cognitive impairment, ultimately including twenty studies spanning cohort analyses, cross-sectional surveys, qualitative work, systematic reviews, experimental designs, and intervention trials. The second reviewed fourteen studies focused specifically on methodological approaches, cataloguing how pain, cognitive performance, and cultural variables are measured in this population. Both reviews followed Joanna Briggs Institute guidance for scoping reviews, searched PubMed and PsycINFO in 2021, and restricted inclusion to English-language articles published in the preceding five years. By integrating the two, the authors could examine not just what the evidence shows, but whether the instruments used to generate that evidence are fit for purpose.

On the empirical side, the picture is broadly consistent but far from uniform. Across the included studies, chronic and persistent pain were generally associated with poorer cognitive outcomes in older adults and dementia populations, with the strongest signals appearing in processing speed and executive functioning. Meta-analytic and cohort evidence cited in the synthesis points to accelerated cognitive decline among people with persistent pain, and a recent meta-analysis of longitudinal cohort studies indicates a small-to-moderate increase in dementia risk among individuals with chronic pain. Yet the relationship is not linear, and its magnitude varies with dementia subtype, disease severity, and the specific cognitive domains being measured.

Here is where the methodological critique bites. Much of the field relies on global cognitive screening tools such as the Mini Mental State Examination (MMSE) and the Montreal Cognitive Assessment (MoCA), prized for their speed and practicality but limited in their sensitivity to the domain-specific impairments, in attention, working memory, executive control, and processing speed, that pain is thought to disrupt. Comprehensive neuropsychological batteries offer far greater specificity but are time-consuming and burdensome for participants with cognitive impairment, so they remain the exception. The result, the authors argue, is a homogenised representation of cognition in which nuanced pain-related differences are collapsed into single global scores, obscuring the very interactions researchers are trying to detect.

The pain side of the equation faces an even sharper contradiction. Self-report is widely regarded as the gold standard for pain assessment, but it becomes increasingly unreliable as cognitive decline progresses, precisely in the populations most affected by dementia. Observational tools such as the Pain Assessment in Advanced Dementia scale (PAINAD) offer an alternative, but they are vulnerable to observer interpretation and to an over-reliance on facial expressions, which may not fully capture an individual’s pain experience. A recent systematic review found that although dementia-specific tools like PAINAD are widely used in emergency departments, there is still no clear evidence that they improve the timeliness or effectiveness of analgesia compared with standard pain scales. Current practice, the synthesis suggests, may privilege observable behaviour over subjective experience, shaping the kind of evidence the field generates.

These methodological tensions lead the authors to a provocative reinterpretation: the much-discussed bidirectional relationship between pain and cognition should be treated with caution. The predominance of cross-sectional and observational designs limits causal inference, and inconsistencies across studies may partly reflect differences in cognitive measures and pain assessment strategies rather than genuine contradictions in the underlying biology. Chronic pain may plausibly impair cognition through attentional interference and reduced engagement in daily activities, while cognitive impairment may interfere with the recognition, communication, and reporting of pain, but disentangling these threads will require longitudinal research with multimodal assessment and more sensitive, domain-specific cognitive measures.

The most striking finding, however, concerns culture. Of the fourteen studies in the methodological review, only one made any explicit reference to ethnicity or cultural grouping; thirteen made no mention of cultural variables at all. Even where demographic information was collected, it was typically limited to broad categories without exploring how cultural context might shape pain reporting, expression, or cognitive test performance. Standardised cognitive assessments and pain measures were generally applied without discussion of cultural validity or cross-cultural applicability, and this absence was rarely acknowledged as a limitation, suggesting that cultural neutrality is often assumed rather than demonstrated.

The consequences are not abstract. Evidence from aged care research shows that pain prevalence may be comparable between immigrant and non-immigrant residents, yet non-English-speaking immigrants reported significantly higher pain intensity, and total pain severity was strongly associated with neuropsychiatric symptom burden across all groups. In neuropsychological assessment, Arabic-speaking populations face additional barriers related to diglossia, literacy levels, and translation issues, which can contribute to misinterpretation or over- or under-diagnosis of cognitive impairment. Interpreter services can support communication during clinical encounters, but they do not resolve the deeper problem that the assessment tools themselves may not be culturally or linguistically valid, particularly where performance is influenced by language structure, educational background, or cultural familiarity with test materials.

The authors argue that culture is not simply missing data but a structural limitation affecting how pain-cognition relationships are interpreted across diverse populations. When tools are applied without consideration of language, education, or migration-related factors, differences in reported pain or cognitive performance may be read as clinical differences when they partly reflect differences in assessment validity. The synthesis is careful to note that the evidence on Arabic-speaking migrants and refugees illustrates one important example of a broader need for culturally appropriate assessment rather than representing all culturally diverse populations, but the underlying pattern, tools developed and validated primarily in Western populations being applied as if universally applicable, recurs throughout the literature.

The path forward, the synthesis concludes, requires simultaneous reform on several fronts. Pain assessment should be tailored to the stage and severity of dementia, combining self-report where possible with observational and behavioural measures, clinical information, and input from caregivers, rather than applying a single method across the dementia spectrum. Research on pain-cognition relationships should favour domain-specific cognitive measures targeting executive functioning, attention, working memory, and processing speed, with greater consistency in outcome selection to improve comparability across studies. Cultural and linguistic factors, including language background, educational experience, ethnicity, and migration history, should be reported systematically, and researchers should verify whether their instruments have been validated for the populations they study. Finally, longitudinal research with multimodal assessment and careful attention to confounders such as dementia subtype, comorbidities, medication use, and demographic characteristics is needed to clarify whether observed associations reflect genuine clinical relationships, methodological artifacts, or an interaction of both. The authors acknowledge their own limitations, including the English-language and five-year restrictions of the underlying reviews and the interpretive nature of critical synthesis, but their central message stands: progress in understanding pain and dementia will demand not just better measurement, but a re-examination of the cultural assumptions embedded in how pain and cognition are defined in the first place.

Subject of Research: The relationship between pain and cognition in dementia and the methodological and cultural limitations of its assessment

Article Title: Pain, cognition, and culture in dementia research: a critical synthesis of empirical and methodological literature

Article References: Taqdees, R., Mercer, T., & Taiwo, A. O. (2026). Pain, cognition, and culture in dementia research: a critical synthesis of empirical and methodological literature. Frontiers in Pain Research, 7, Article 1797629. https://doi.org/10.3389/fpain.2026.1797629

Image Credits: AI Generated

DOI: 10.3389/fpain.2026.1797629

Keywords: dementia, chronic pain, cognition, pain assessment, cognitive assessment, cultural factors, scoping review, MMSE, MoCA, PAINAD, executive functioning, multimodal assessment