Research Output


If you would like an online copy (re-print) of any of our publications, please write to us at:cognitiveneurologyclinic@gmail.com

Ramanan, S, Narayanan, J, D'Souza, T.P., Malik, K.S. & Ratnavalli, E. (2015) Total output and switching in category fluency successfully discriminates Alzheimer's disease from Mild Cognitive Impairment but not from frontotemporal dementia. Dementia Neuropsychology, 9 (3), 1-8.

Ramanan, S. & Kumar, D. (2013). Prospective Memory in Parkinson's Disease: A Meta-analysis. Journal of the International Neuropsychological Society, 19, 1-10.

Narayanan, J., Duncan, R., Greene, J., Leach, J-P., Razvi, S., McLean, J., & Evans, J. J. (2012). Accelerated long-term forgetting in temporal lobe epilepsy: Verbal, nonverbal and autobiographical memory. Epilepsy & Behavior, 25, 622-630.

Ratnavalli, E. (2010). Progress in the last decade in our understanding of primary progressive aphasia. Annals of Indian Academy of Neurology, 13 (Suppl2), S109.

Zimmerman, S., Sloane, P. D., Williams, C. S., Dobbs, D., Ellajosyula R., Braaten, A., Rupnow, M. F., & Kaufer, D. (2007). Residential care/assisted living staff may detect undiagnosed dementia using the minimum data set cognition scale. Journal of the American Geriatrics Society, 55, 1349-1355

Srikanth, S., Nagaraja, A. V., & Ratnavalli, E. (2005). Neuropsychiatric symptoms in dementia-frequency, relationship to dementia severity and comparison in Alzheimer's disease, vascular dementia and frontotemporal dementia. Journal of the neurological sciences, 236(1), 43-48.

Ratnavalli, E., Brayne, C., Dawson, K., & Hodges, J. R. (2002). The prevalence of frontotemporal dementia. Neurology, 58(11), 1615-1621.

Shivashankar, N., Shashikala, H. R., Nagaraja, D., Jayakumar, P. N., & Ratnavalli, E. (2001). Pure word deafness in two patients with subcortical lesions. Clinical neurology and neurosurgery, 103(4), 201-205.

Ratnavalli, E., Murthy, G. G., Nagaraja, D., Veerendrakumar, M., Jayaram, M., & Jayakumar, P. N. (2000). Alexia in Indian bilinguals. Journal of Neurolinguistics, 13, 37-46.

Chapters in books


E. Ratnavalli. Rapidly progressive dementia. In Neurology in Tropics- 2nd edition, 2015, published by Elsevier Asia. In press.

E. Ratnavalli. Delirium. In Differential diagnosis in neurology - Jaypee Brothers Medical Publishing. 2015. In press.

E.Ratnavalli. Diagnosis and management of Alzheimer's disease.Postgraduate Medicine. Association of Physicians of India. Thakur BB (ed). 2002;16:245-264

E. Ratnavalli. Human Memory: organization and Neural substrates. Reviews in Neurology, Mohandas S, Borgohain R and Meena AK (ed.), Indian Academy of Neurology 1998;8-15.

Abstracts in journals


Ratnavalli, E.,Veerendrakumar, M.,Pal, P. K., Nagaraja, D., & Jayakumar, P. N. (2001). Causes and Problems in diagnosis of dementia: A study in a hospital population from South India. Neurology, 56, A 175.

Ratnavalli, E., Jayakumar, P., & Shankar, R. (2002). MR morphometric and proton spectroscopic differentiation of Alzheimer's disease and Frontotemporal dementia. Neurobiology of Aging, 23, S477

Recent Presentations in International Meetings


Dev, N., Narayanan, J. et. al. Exploring Executive Functioning in Patients with Frontal Lobe and Temporal Lobe Epilepsy Using a Novel Ecologically-Valid Virtual Reality Task: The Jansari Assessment of Executive Functions (JEF) © – Presented as a poster at the Mid-Year meeting of the International Neuropsychological Society (Jerusalem), 2014.

E. Ratnavalli et al. 'Young onset Dementias: A study on the Clinical Profile and Socio-cultural factors influencing diagnosis from a memory clinic in Urban South India'. Poster presented at the ICAD meeting, Vancouver, July 16-22, 2012

E. Ratnavalli et al. 'A study on the Clinical Profile & Socio-cultural factors influencing diagnosis of Mild cognitive Impairment and Dementia from a memory clinic in urban South India'. Poster presented at the 63rd Annual meeting of the American Academy of Neurology at Honolulu, Hawaii, April 9-14, 2011

WFN Biennial Meeting - 2014


The following posters were presented at the World Federation of Neurology (WFN) Biennial Meeting, 2014 in Hong Kong:

Numerical Abilities in Dementia and Mild Cognitive Impairment

The study looked at understanding numerical abilities in patients with Mild Cognitive Impairment (MCI), Alzheimer's disease (AD) and behavioral variant frontotemporal dementia (bvFTD). Thirty-one patients and healthy volunteers were assessed on a numerical battery (Cappelletti et al. 2012, Neuropsychology, 26, pp 1-9) that included tests of quantity comparison, numerical order, letter and number transcoding, reading, writing, simple and complex arithmetic problems. Statistical analyses revealed that only our AD patients were significantly impaired of calculation skills, while both AD and bvFTD patients were performed poorly on transcoding tasks. Our findings suggest that these profiles of numerical abilities may aid in differential diagnosis of MCI, AD and bvFTD and also offer better understanding into the neural underpinnings of numerical ability.

Verbal Fluency in Multilinguals: Comparison between English and Indian languages across mild cognitive impairment and Alzheimer's disease

The present study investigated performance profiles on the verbal fluency task across English and the Indian languages in patients with dementia. Sixty-four participants including healthy volunteers, patients with Mild Cognitive Impairment (MCI) and Alzheimer's disease (AD), equally proficient in English and an Indian language were administered the verbal fluency test in both languages. Results indicated a significant interaction effect between the language in which verbal fluency was performed and the group. Healthy volunteers performed better in English compared to the Indian languages on the verbal fluency task, the same was not seen in patients with MCI and AD. Our findings suggest that a breakdown in secondary languages in patients with dementia may impede the facilitative effect of English. Findings also indicate that patients tend to use their Indian language (most often their primary language) even though they may have been equally fluent in English.