Abstract
Background
Semantic memory deficits are frequently encountered in dementia and distinct patterns of semantic impairment characterize the subtypes of dementia. Life course and cultural experiences significantly influence semantic memory. Hence, there is a need to assess semantic memory using culturally appropriate tests, to aid accurate diagnosis of dementia and facilitate cross-cultural collaborative research.
Aims
In this prospective study, we adapted and validated the Cambridge Semantic Memory (CSM) test battery to the Indian cultural context and studied the patterns of semantic memory impairment across dementia subtypes.
Methods
The CSM battery was modified using standard methods and by incorporating culturally appropriate changes and new semantic categories relevant to India. The adapted Indian Semantic Memory (ISM) test battery was administered to a cohort of 121 subjects, consisting of controls and dementia: Alzheimer’s disease (AD), progressive non-fluent aphasia (PNFA), semantic dementia (SD), and behavioral variant fronto-temporal dementia (BvFTD). Profile of semantic memory performance across groups was examined.
Results
The ISM battery was found to be a valid measure of semantic memory. The novel semantic categories of gods/religious icons, vegetables, and food items added value to the diagnostic process. Distinct semantic memory profiles in SD, PNFA, AD, and BvFTD were demonstrated.
Conclusions
The cultural adaptation of a semantic memory battery for the Indian context provided sensitive evidence of semantic memory impairment in dementia and its subtypes. The clinical and research application of the ISM battery will enhance diagnostic evaluation that can aid in early and accurate identification of deficits and devising intervention strategies and enable research across cultures.
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Acknowledgments
We would like to thank Professor John Hodges for providing us with permissions to use and adapt the Cambridge Semantic Memory test battery.
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Data available upon request.
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Funding
This work was supported by the Department of Science and Technology [grant number: SR/CSI/13/2008].
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AP: designed and conceptualized study; analyzed the data; drafted the manuscript for intellectual content. VVP: interpreted the data; revised the manuscript for intellectual content. SM: performed biostatistical review of results. DKJ: data collection and analysis; FA: data collection, interpreted the data, revised the manuscript for intellectual content. GKI, RK, GD, FV, SK, KP: interpreted the data, revised the manuscript for intellectual content. SA: designed and conceptualized study; analyzed the data; drafted the manuscript for intellectual content; interpreted the data; revised the manuscript for intellectual content. All authors read and approved the final manuscript.
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Avanthi Paplikar is funded by the Department of Bio-Technology (DBT). Shailaja Mekala is funded by the Department of Science and Technology (DST). Gowri. K. Iyer, Rajamohan Kandukuri, and Gollahalli Divyaraj are funded by the Indian Council of Medical Research (ICMR). The authors declare no competing interests.
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This study was performed in line with the principles of the Declaration of Helsinki. The Research Ethics Committees of NIMS, Hyderabad, and NIMHANS, Bengaluru, approved the study. Informed consent was obtained from all the participants and their family caregivers.
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Informed consent was obtained from all the participants and their family caregivers.
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Informed consent was obtained from all the participants and their family caregivers.
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Paplikar, A., Vandana, V.P., Mekala, S. et al. Semantic memory impairment in dementia: A cross-cultural adaptation study. Neurol Sci 43, 265–273 (2022). https://doi.org/10.1007/s10072-021-05272-5
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DOI: https://doi.org/10.1007/s10072-021-05272-5