Dr. Roger A. Dixon

Contact Information:

 

Mailing Address

Department of Psychology

P-217 Biological Sciences Bldg

University of Alberta

Edmonton, AB

Canada T6G 2E9

 

Email

rdixon@ualberta.ca

Recent Trainees: Activities and Recognitions

 

Our research programs are highly collaborative, both within UAlberta and across a number of other institutions. Collaborators include not only advanced career researchers in a variety of related fields (neurology, neuroscience, genetics, imaging, psychology, psychiatry, biochemistry, statistics, and machine learning), but also early career trainees and researchers. The latter group includes undergraduate students, graduate students (MSc, PhD), research staff, post-doctoral fellows, and research associates. On this page, we are pleased to highlight the interests and accomplishments of some recent trainees and early career associates. Without their commitment and diligence, my own work would be greatly reduced in quantity and quality.

RAD in Berlin, Photo by AvE

Linzy Bohn, MSc

Current Research: Linzy is a PhD student in Psychology conducting research on cognitive aging and dementia, with specializations in longitudinal studies, trajectory analyses, data-driven analytics, risk biomarker predictors, and multi-morbidity (frailty).

 

Recent Awards:

2020 Gyro Club of Edmonton Graduate Scholarship — Doctoral Level

2020 Thelma R. Scambler Scholarship

2019 International Society for the Study of Behavioral Development Graduate Scholarship

2019 President’s Doctoral Prize of Distinction

2018 President’s Doctoral Prize of Distinction

 

Recent Papers:

Bohn, L., Zheng, Y., McFall, G.P., & Dixon, R.A. (2020). Portals to frailty? Latent profile analyses detect early frailty subtypes. Manuscript submitted for publication.

 

Bohn, L., McFall, G.P., Wiebe, S.A., & Dixon, R.A. (in press). Body mass index predicts
cognitive aging trajectories selectively for females: Evidence from the Victoria Longitudinal Study. Neuropsychology. doi:10.1037/neu0000617

 

Bohn, L., Zheng, Y., McFall, G.P., & Dixon, R.A. (2019, November). Early frailty phenotypes
and predictions of cognitive aging: Evidence from the Victoria Longitudinal Study. Poster presented at the Gerontological Society of America, Austin, TX.

 

Bohn, L., Kwong See, S.T., & Fung, H.H. (2016). Time perspective and positivity effects in Alzheimer's disease. Psychology and Aging, 31(6), 574—582. doi:10.1037/pag0000084

 

Current Students

Sebastian Caballero, MSc

Current Research: Sebastian is a PhD student in Neuroscience conducting research on multiple modalities of biomarkers for brain aging, cognitive impairment, and neurodegenerative disease.

 

Recent Awards:

2019 SynAD Award for Enhancing Training Capacity in ADRD

2018 Government of Alberta Graduate Student Scholarship

2018 Poster Award at the Promoting Healthy Brain Aging and Preventing Dementia: Research and Translation international conference in Banff

2018 University of Alberta Graduate Student Association Graduate Student Research
Assistant Award

 

Recent Papers:

Caballero, H.S., McFall, G.P., Wiebe, S., & Dixon, R.A. (in press). Integrating three characteristics of executive function in non-demented aging: Trajectories, classification, and biomarker predictors. Journal of the International Neuropsychological Society. doi:10.1017/S1355617720000703

 

Caballero, H.S., McFall, G.P., Gee, M., Nelles, K., Burt, J., MacDonald, S.W.S., Dixon, R.A., & Camicioli, R. (2020, March). Fluctuating cognition in neurodegenerative disease: Comparing reaction time mean rate and inconsistency. Poster presented at the 21st Annual Neuroscience and Mental Health Institute Research Day, Edmonton, AB.

 

Caballero, H.S., McFall, G.P., Zheng, Y., & Dixon, R.A. (2020). Data-driven approaches to executive function performance in aging: Integrating person-centered analyses and machine learning risk prediction. Manuscript in preparation.

 

Shannon Drouin, MSc

Current Research: Shannon is a PhD student in Psychology conducting longitudinal research on brain aging and neurodegenerative disease with the application of various quantitative modeling techniques (e.g., machine learning and other data-driven approaches).

 

Recent Awards:

2020 Alberta Graduate Excellence Scholarship

2020 Alberta Innovates Graduate Student Scholarship — Data-Enabled Innovation

2020 Brendan Gail Rule Graduate Scholarship

2020 International Society for the Study of Behavioral Development Graduate Scholarship

2019 Alberta Excellence Graduate Scholarship

2019 Brendan Gail Rule Scholarship

2019 CIHR-CCNA Travel Award to attend CCNA Science Days

2018 Queen Elizabeth II Graduate Scholarship

2018 Brendan Gail Rule Graduate Scholarship

 

Recent Papers:

Drouin, S.M., McFall, G.P., & Dixon, R.A. (2020). In multiple facets of Subjective Memory Decline sex moderates memory predictions. Alzheimer's & Dementia: Diagnosis, Assessment & Disease Monitoring, 12(1), e12089. doi:10.1002/dad2.12089

 

Drouin, S., McFall, G.P., Potvin, O., Bellec, P., Duchesne, S., & Dixon, R.A. (2019, October). Machine learning analyses of longitudinal imaging trajectories: Discrimination and biomarker prediction of change subclasses and clinical outcomes. Poster presented at Canadian Consortium on Neurodegeneration and Aging, Quebec City, QC. (Manuscript in preparation)

 

McFall, G.P., Potvin, O., Dieumegarde, L., Drouin, S., Camicioli, R., Collins, L., Bellec, P., Duchesne, S., & Dixon, R.A. (2019, July). Trajectory analyses of morphometric imaging measures provide novel insights into the dynamics of brain aging as moderated by sex and APOE. Presented at Alzheimer's Association International Conference, Los Angeles, CA.

 

Mackenzie Heal, BSc

Current Research: Mackenzie is a first-year Master’s student in Neuroscience conducting longitudinal research on biomarker predictors of cognitive aging and dementia. She is currently focusing on integrating newly acquired Alzheimer's genetic risk factors in a large trajectory database.

 

 

 

 

 

Sheri Thibeau, MSc

Current Research: Sheri is a PhD student in Psychology conducting research on physical activity and mobility in cognitive aging.

 

Recent Awards:

2019 and 2020: Instructor in Aging, Impairment and Alzheimer's Disease

2018 Queen Elizabeth II Doctoral Scholarship

2017 ASC-CCNA (Alzheimer's Society of Canada - Canadian Consortium on Neurodegeneration
in Aging) poster award in the PhD Category at the CCNA Science Day, Toronto, ON

 

Recent Papers:

Thibeau, S., McDermott, K.L., McFall, G.P., Rockwood, K., & Dixon, R.A. (2019). Frailty effects on non-demented cognitive trajectories are moderated by sex and Alzheimer's genetic risk. Alzheimer's Research & Therapy, 11, 55. doi:10.1186/s13195-019-0509-9

 

Thibeau, S., McFall, G.P., Camicioli, R., & Dixon, R.A. (2019). Physical activity and mobility differentially predict non-demented executive function trajectories: Do sex and APOE moderate these associations? Gerontology, 65, 640-648. doi:10.1159/000496442

 

Thibeau, S., McFall, G.P., Camicioli, R., & Dixon, R.A. (2017). Alzheimer's disease biomarkers interactively influence physical activity, mobility, and cognition associations in a non-demented aging population. Journal of Alzheimer's Disease, 60(1), 69-86. doi: 10.3233/JAD-170130

 

Samantha Fu, BSc

Research: Subjective cognitive impairment in normal aging and dementia.

 

Recent Awards: BSc Research Specialization, Faculty of Science

 

Recent Papers:

Drouin, S., McFall, G.P., Fu, S.X., & Dixon, R.A. (2018, June). A four-facet model of subjective memory decline in non-demented aging: Selective prediction sensitivity for women. Poster presented at the International Conference on Promoting Healthy Brain Aging and Preventing Dementia: Research and Translation, Banff, AB.

 

Drouin, S., McFall, G.P., Fu, S.X., & Dixon, R.A. (2018, April). A four-facet model of subjective memory decline in non-demented aging: Selective prediction sensitivity for women. Poster presented at the annual Joseph R. Royce Conference, Department of Psychology, University of Alberta, Edmonton, AB.

 

Fu, S.X., McFall, G.P. & Dixon, R.A. (2017, March) Subjective memory decline in non-demented aging: Exploring multidimensionality, group differences, longitudinal changes. Poster presented at the annual Joseph R. Royce Conference, Department of Psychology, University of Alberta, Edmonton, AB.

 

Annie Han (BSc Student)

Current Research: Gender and sex in brain aging and dementia.

 

Recent Research: Identification and integration of gender predictors of brain and cognitive aging trajectories.

 

 

Kirsty McDermott, MSc

Research: Resilience in brain aging; Risk and protective factors of healthy brain and memory aging.

 

Recent Awards: 2016 Outstanding Student Poster at the Alzheimer’s Association International Conference

 

Recent Papers:

McFall, G.P., McDermott, K.L., & Dixon, R.A. (2019). Modifiable risk factors discriminate memory trajectories in non-demented aging: Precision factors and targets for promoting healthier brain aging and preventing dementia? Journal of Alzheimer's Disease, 70, S101-S118. doi:10.3233/JAD-180571

 

Thibeau, S., McDermott, K.L., McFall, G.P., Rockwood, K., & Dixon, R.A. (2019). Frailty effects on non-demented cognitive trajectories are moderated by sex and Alzheimer's genetic risk. Alzheimer's Research & Therapy, 11, 55. doi:10.1186/s13195-019-0509-9

 

McDermott, K., McFall, G.P., Andrews, S.J., Anstey, K.J., & Dixon, R.A. (2017). Memory resilience to Alzheimer's genetic risk: Sex effects in predictor profiles. Journal of Gerontology: Psychological Sciences, 72(6), 937-946. doi:10.1093/geronb/gbw161

 

Sarah Tipples (BSc Honours)

Current Research: Cognitive reserve and resilience in Parkinson's disease (Honours Thesis,
Co-Supervised by Dr. Richard Camicioli).

 

Recent Awards: Queen Elizabeth Scholarship (University of Alberta): Internship at Oxford University (UK)

 

 

 

Selected Recent Alumni

G. Peggy McFall, PhD

Current Status:

Research Associate, University of Alberta (Department of Psychology, Neuroscience and Mental Health Institute).

Assistant Director, Victoria Longitudinal Study.

Representative (Biomarkers Team), Sex and Gender Cross-cutting Program, Canadian Consortium on Neurodegeneration in Aging.

 

Current Research: Longitudinal and dynamic statistical analyses (including machine learning and similar technologies) as applied to dementia risk factor, biomarker, and genetic predictors.

 

Recent Awards:

2020 SynAD Catalyst Grant for Strengthening Research Capacity in ADRD

2019 SynAD Catalyst Grant for Strengthening Research Capacity in ADRD

2018 ASC-CCNA (Alzheimer's Society of Canada - Canadian Consortium on Neurodegeneration in Aging) poster award in the Postdoctoral Category at the CCNA Science Day, Montreal, QC

2017 ASC-CCNA (Alzheimer's Society of Canada - Canadian Consortium on Neurodegeneration
in Aging) poster award in the Postdoctoral Category at the CCNA Science Day, Toronto, ON

2017 Connie Varnhagen Excellence in Teaching Psychology Award, University of Alberta

 

Recent Papers:

Badhwar, A., McFall, G.P., Sapkota, S., Black, S., Chertkow, H., Duchesne, S., Masellis, M., Li, L., Dixon, R.A., & Bellec, P. (in press). A multiomics approach to
heterogeneity in Alzheimer's disease: Focused review and roadmap. Brain.
doi:10.1093/brain/awz384

 

McFall, G.P., Drouin, S., Potvin, O., Dieumegarde, L., Collins, L., Bellec, P., Duchesne, S., & Dixon, R.A. (2020). Modeling variability in longitudinal trajectories of hippocampal volume: Moderation by sex and APOE. Manuscript in preparation.

 

McFall, G.P., Bäckman, L., & Dixon, R.A. (2019). Nuances in Alzheimer's genetic risk reveal differential predictions of non-demented memory aging trajectories: Selective patterns by APOE genotype and sex. Current Alzheimer Research, 16(4), 302-315. doi:10.2174/1567205016666190315094452

 

McFall, G.P., McDermott, K.L., & Dixon, R.A. (2019). Modifiable risk factors discriminate memory trajectories in non-demented aging: Precision factors and targets for promoting healthier brain aging and preventing dementia? Journal of Alzheimer's Disease, 70, S101-S118. doi:10.3233/JAD-180571

 

Shea Andrews, PhD (Australian National University)

Current Status: PDF, Loeb Center for Alzheimer’s Disease, Icahn School of Medicine at Mount Sinai, NYC.

 

Current Research: Polygenic risk in Alzheimer’s disease; Quantitative analytics of biomarkers and risk in AD.

 

Recent Awards: Alzheimer’s Association Research Fellowship (Assessing the Causal Role of Mitochondria in Alzheimer’s Disease)

 

Recent Papers:

Peters, R., Yasar, S., Anderson, C., Andrews, S.J., ... Dixon, R.A., ... McFall, G.P., ... & Anstey, K.J. (2020). An investigation of antihypertensive class, dementia and cognitive decline. A meta-analysis. Neurology, 94, 1-15. doi:10.1212/WNL.0000000000008732

 

Andrews, S.J., McFall, G.P., Booth, A., Dixon, R.A., & Anstey, K.J. (2019). Association of Alzheimer's disease genetic risk loci with cognitive performance and decline: A systematic review. Journal of Alzheimer's Disease, 69, 1109-1136. doi:10.3233/JAD-190342

 

Andrews, S.J., McFall, G.P., Dixon, R.A., & Anstey, K.J. (2019). Alzheimer's environmental and genetic risk scores are differentially associated with general cognitive ability and dementia severity. Alzheimer Disease & Associated Disorders, 33, 95-103. doi:10.1097/WAD.0000000000000292

 

McDermott, K., McFall, G.P., Andrews, S.J., Anstey, K.J., & Dixon, R.A. (2017). Memory resilience to Alzheimer's genetic risk: Sex effects in predictor profiles. Journal of Gerontology: Psychological Sciences, 72(6), 937-946. doi:10.1093/geronb/gbw161

 

Shraddha Sapkota, PhD

Current Status: Postdoctoral Fellow, Hurvitz Brain Sciences Research Program, Sunnybrook Research Institute, Toronto, ON.

 

Current Research: Network and omics approaches to biomarker and risk factor studies of brain aging, impairment, and neurodegenerative disease.

 

Recent Awards:

2017-2019 Postdoctoral Fellowship from the Alzheimer Society of Canada (Sunnybrook Health Sciences Centre, University of Toronto)

2017 Postdoctoral Fellow, Canadian Consortium on Neurodegeneration in Aging (University of Alberta)

2014 Emerging Scholar Award from the Gerontological Society of America

 

Recent Papers:

Badhwar, A., McFall, G.P., Sapkota, S., Black, S., Chertkow, H., Duchesne, S., Masellis, M., Li, L., Dixon, R.A., & Bellec, P. (in press). A multiomics approach to
heterogeneity in Alzheimer's disease: Focused review and roadmap. Brain.
doi:10.1093/brain/awz384

 

Sapkota, S., & Dixon, R.A. (2018). A network of genetic effects on non-demented cognitive aging: Alzheimer’s genetic risk (CLU + CR1 + PICALM) intensifies cognitive aging genetic risk (COMT + BDNF) selectively for APOE ε4 carriers. Journal of Alzheimer's Disease, 62(2), 887-900. doi:10.3233/JAD-170909

 

Sapkota, S., Huan, T., Tran, T., Zheng, J., Camicioli, R., Li, L., & Dixon, R.A. (2018). Alzheimer's biomarkers from multiple modalities selectively discriminate clinical status: Relative importance of salivary metabolomics panels, genetic, lifestyle, cognitive, functional health, and demographic risk markers. Frontiers in Aging Neuroscience, 10, 296.
doi:10.3389/fnagi.2018.00296

 

Sanda Dolcos, PhD (North Carolina)

Current Status: Research Associate, University of Illinois (Beckman Institute and Department of Psychology).

 

Current Research: Social, personality, and affective neuroscience; cognitive and affective aging; emotional wellbeing.

 

Recent Awards: Post-doctoral Fellowship, Department of Psychology, University of Illinois

 

Recent Papers:

Katsumi, Y., Dolcos, S., Dixon, R.A., Fabiani, M., Stine-Morrow, E.A.L., & Dolcos, F. (in press). Immediate and long-term effects of emotional suppression in aging: A functional MRI investigation. Psychology and Aging.

 

Dolcos, S., Katsumi, Y., & Dixon, R.A. (2014). The role of arousal in the spontaneous regulation of emotions in healthy aging: An fMRI investigation. Frontiers in Psychology: Emotion Science, 5(681), 1-12. doi:10.3389/fpsyg.2014.00681

 

Dixon, R.A., McFall, G.P., Whitehead, B.P., & Dolcos, S. (2013). Cognitive development in adulthood and aging. In R.M. Lerner, M.A. Easterbrooks, & J. Mistry (Eds.), Handbook of psychology: Vol. 6 Developmental psychology (2nd ed., pp. 451-474). Editor-in-chief: I.B. Weiner. Hoboken, NJ: Wiley.

 

 

Former Trainees: Additional information is available on the Victoria Longitudinal Study website.

 

©2020 Roger Dixon