Life Sciences Commons^™

A Simulated Walk In Nature: Testing Predictions From The Attention Restoration Theory, Corey Crossan

Electronic Thesis and Dissertation Repository

Attention Restoration Theory (ART) predicts that top-down processing during everyday activities can cause attentional fatigue and that bottom-up processing that occurs when people experience nature will be restorative (Kaplan, 1995). The present study examined this prediction by exposing participants to three different conditions using a repeated measures design: a control condition during which participants walked on a typical treadmill, a nature/restorative condition during which participants walked on the same treadmill, experiencing a simulated nature walk, and a perturbation condition that included the same simulated nature scene but also required top-down processing during the walk. The findings supported ART predictions. As …

Decoding Mental States After Severe Brain Injury, Raechelle M. Gibson

Electronic Thesis and Dissertation Repository

Some patients with disorders of consciousness retain sensory and cognitive abilities that are not apparent from their outward behaviour. It is crucial to identify and characterise these covert abilities for diagnosis, prognosis, and medical ethics. This thesis uses neuroimaging techniques to investigate cognitive preservation and awareness in patients who are behaviourally non-responsive due to acquired brain injuries. In the first chapter, a large sample of healthy volunteers, including experienced athletes and musicians, imagined actions of varying complexity and familiarity. Motor imagery involving certain complex, familiar actions correlated with a more robust sensorimotor rhythm. In the second chapter, several patients with …

Cognitive And Non-Cognitive Dysfunction In A Mouse Model Of Alzheimer's Disease, Wai-Jane V. Lee

Electronic Thesis and Dissertation Repository

Sensitive and translational tasks that efficiently and accurately assess cognitive function during pre-clinical trials would be useful in developing novel treatments for Alzheimer's disease (AD) patients. The Bussey-Saksida touchscreens employ various tasks similar to those used in humans to effectively evaluate high-level cognitive and executive functions in mice. This face validity provides the best chance of successful cognitive translation across species.

In our study, donepezil had minor effects on the performance of 5xFAD mice in the 5-CSRTT, a touchscreen task evaluating attention. Additionally, 5xFAD mice do not demonstrate impairments in the PVD task, which assesses visual discrimination/ cognitive flexibility. However, …