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Healthy City Lab / Publications

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Driving, Social Distancing, Protective, and Coping Behaviors of Older Adults Before and During COVID-19

Catherine M. Roe, Sayeh Bayet, Jamie Hicks, Ann M Johnson, Samantha Murphy, Jason M. Doherty, Ganesh M. Babulal

Journal of Applied Gerontology 2022

Here, we explore the impact of the COVID-19 pandemic on driving, social distancing, protective, and coping behaviours of older adults by reporting data on participants above 65 whose driving behaviours are being monitored using GPS devices.


GPS Driving: A Digital Biomarker for Preclinical Alzheimer Disease

Sayeh Bayat, Ganesh M. Babulal, Suzanne E. Schindler, Anne M. Fagan, John C. Morris, Alex Mihailidis, Catherine M. Roe

Alzheimer's Research & Therapy 2021

We applied machine learning methods to a large dataset of GPS driving trajectories from a cohort of cognitively intact older drivers with and without preclinical AD. Our findings suggest that driving may serve as an effective and accurate digital biomarker for identifying preclinical AD among older adults. 


Outdoor Life in Dementia: How predictable are people with dementia in their mobility?

Sayeh Bayat and Alex Mihailidis.

Alzheimer's & Dementia: DADM 2021

Aiming to better capture the essence of mobility of people with dementia, we analyze the randomness and predictability manifested in their GPS trajectories. We find that relying on both spatial and temporal patterns,  a 4-week record of mobility patterns of people with dementia displays 95% potential predictability.


A GPS-based Framework for Understanding Outdoor Mobility Patterns of Older Adults with Dementia: An Exploratory Study

Sayeh Bayat, Gary Naglie, Mark Rapoport, Elaine Stasiulis, Michael J Widener and Alex Mihailidis.

Gerontology 2021

We develop a comprehensive framework for comparing outdoor mobility patterns of cognitively intact older adults and older adults with dementia using passively collected GPS data.


Bringing the ‘Place’ to Life Space in Gerontology Research

Sayeh Bayat, Michael J Widener and Alex Mihailidis.

Gerontology 2021

We discuss new directions for extending the life-space framework in environmental gerontology by drawing on the advancements in the activity space framework in travel behaviour and health geography literature.


Inferring Destinations and Activity Types of Older Adults From GPS Data: Algorithm Development and Validation

Sayeh Bayat, Gary Naglie, Mark Rapoport, Elaine Stasiulis, Belkacem Chikhaoui and Alex Mihailidis.


We develop and validate a framework that relies solely on GPS data to capture older adults’ travel destinations (ie, stop points) and activity types. We show that GPS technology can be used to extend the traditional life-space assessments by accurately determining semantic dimensions of outdoor mobility.