Dr Carys Evans
My main research interest is in cognitive neuroscience, neuropsychology, and understanding neurological illness to aid rehabilitation. Specifically, I am interested in examining dissociation's in processing that have been further understood through research with patients and neuromodulation techniques including transcranial magnetic (TMS) and electrical (tES) stimulation. Click here for further detail.
I am currently part of the Bestmann Lab at UCL.
A majority of my research has explored interventions in pathology and healthy ageing across two main topics:
movement planning and execution, and mood and emotion processing in ageing.
Movement planning and execution
Cortical excitability after stroke
I am currently exploring changes in cortical excitability in patients with upper limb impairment following stroke, and whether these changes can be modulated using brain stimulation. These effects are explored early and late post-stroke.
To find out more, visit the ReCAPS Study website.
Apraxia and motor imagery
As part of my doctoral research I assessed the role of motor imagery (dynamic simulation of a motor act) in functional use of objects and whether impairments in motor imagery can be attributed to object-use errors observed in apraxia, a high level motor disorder that can occur after stroke. Alongside work with patients, I used tDCS with healthy populations to explore the effect of parietal stimulation on motor imagery ability and the perception of tool-use.
Mood and emotion processing in ageing
My postdoctoral research explores the effect of tDCS/ tRNS on state mood and emotion processing, and how modulation effects might differ depending on individual differences. In particular, how age, trait mood, and cardiovascular risk factors may affect the efficacy of stimulation.
Behavioural and Neuropsychological
Neuromodulation: transcranial direct current (tDCS), random noise (tRNS), and magnetic (TMS) stimulation
Kinematic: MiniBIRD motion tracker systems
Evans, C., Jurj, I., Williams, E., Banissy, M., Charlton, R. A., (in prep). Lower doses of tDCS improve wellbeing in euthymic younger but not older adults. Manuscript in preparation.
Gregoriou, E., Evans, C., Lee, J., Ward, N., Bestmann, S. (submitted). Electric-field Variability of HD-tDCS.
Evans, C., Bachmann, C., Lee, J., Gregoriou, E., Ward, N., Bestmann, S. (2020). Dose-controlled tDCS reduces electric field intensity variability at a cortical target site, 13, 125-136. doi: 10.1016/j.brs.2019.10.004. (link / bioRxiv)
Evans, C., Banissy, M.J., & Charlton, R.A. (2018). The efficacy of transcranial random noise stimulation (tRNS) on mood may depend on individual differences including age and trait mood, Clinical Neurophysiology, 129(6), 1201-1208. doi: 10.1016/j.clinph.2018.03.012. (link)
Taylor, L. J., Evans, C., Greer, J., Senior, C., Coventry, K. R., & Ietswaart, M. (2017). Dissociation between semantic representations for motion and action verbs: Evidence from patients with left hemisphere lesions. Frontiers in Human Neuroscience, 11(35). doi: 10.3389/fnhum.2017.00035. (link)
Evans, C., Edwards, M. G., Taylor, L. J., & Ietswaart, M. (2016). Perceptual decisions regarding object manipulation implicate the left IPL: evidence from an apraxia and a tDCS study. Neuropsychologia, 86, 153- 166. doi: 10.1016/j.neuropsychologia.2016.04.020. (link)
Evans, C., Edwards, M. G., Taylor, L. J., & Ietswaart, M. (2016). Impaired communication between the dorsal and ventral stream: indications from Apraxia. Frontiers in Human Neuroscience, 10(8). doi: 10.3389/fnhum.2016.00008. (link)
Ietswaart, M., & Evans, C. (2014). In search for the core of apraxia. Cortex, 57, 283–285. doi: 10.1016/j.cortex.2014.02.021. (link)
Evans, C., Milner, A. D., Humphreys, G. W., & Cavina-Pratesi, C. (2013). Optic ataxia affects the lower limbs: Evidence from a single case study. Cortex, 49(5), 1229-40. doi: 10.1016/j.cortex.2012.07.008. (link)
Evans, C., Edwards, M. G., Taylor, L., & Ietswaart, M. (2012). The role of the fronto-parietal network in motor imagery evaluated using tDCS. Journal of Mental Imagery, 36(3&4). Abstract.