Viji Easwar, PhD
Position title: Assistant Professor, Communication Sciences and Disorders
PhD, The University of Western Ontario
Assistant Professor, Communication Sciences and Disorders
My research focuses on auditory development in children with and without hearing loss. In particular, I am interested in investigating the effects of age, auditory deprivation, and hearing prostheses like hearing aids or cochlear implants on how sounds, particularly speech stimuli, are encoded by the auditory system using electroencephalography (EEG) techniques. In addition to studying auditory development, my research interests include investigating factors that contribute to between-subject variability in EEG measures evoked by sound. Of particular interest is the speech-evoked envelope following response. The overall goal of my research program is to develop evidence that can help inform intervention strategies in children with hearing loss and extend the use of EEG techniques to clinical practice to help clinicians (audiologists) evaluate intervention outcomes in children.
I currently direct the Child Hearing Lab, or in short, the Chear lab. We collaborate closely with the Efferent Systems Lab directed by Dr. Sriram Boothalingam.
Easwar V, Scollie S, Aiken S, Purcell D. (2020). Test-Retest Variability in the Characteristics of Envelope Following Responses Evoked by Speech Stimuli. Ear and Hearing, 41(1):150-164. doi: 10.1097/AUD.0000000000000739.
Easwar V, Scollie S, Purcell D. (2019). Investigating potential interactions between envelope following responses elicited simultaneously by different vowel formants. Hearing Research, 380:35-45. doi: 10.1016/j.heares.2019.05.005.
Easwar V, Sanfilippo J, Papsin B, Gordon K. (2018) Impact of consistency in daily device use on speech perception abilities in children with cochlear implants: Datalogging evidence. Journal of the American Academy of Audiology, 29(9):835-846. doi: 10.3766/jaaa.17051.
Easwar V, Yamazaki H, Deighton M, Papsin B, Gordon K. (2017) Simultaneous bilateral cochlear implants: Developmental advances do not yet achieve normal cortical processing. Brain and Behavior. 28;7(4):e00638. doi: 10.1002/brb3.638.
Easwar V, Yamazaki H, Deighton M, Papsin B, Gordon K. (2017) Cortical Representation of Interaural Time Difference Is Impaired by Deafness in Development: Evidence from Children with Early Long-term Access to Sound through Bilateral Cochlear Implants Provided Simultaneously. Journal of Neuroscience. 1;37(9):2349-2361. doi: 10.1523/JNEUROSCI.2538-16.2017.
Easwar V, Purcell DW, Aiken SJ, Parsa V, Scollie SD. (2015) Evaluation of Speech-Evoked Envelope Following Responses as an Objective Aided Outcome Measure: Effect of Stimulus Level, Bandwidth, and Amplification in Adults With Hearing Loss. Ear and Hearing. 36(6):635-52. doi: 10.1097/AUD.0000000000000199.
Easwar V, Purcell DW, Aiken SJ, Parsa V, Scollie SD. (2015) Effect of Stimulus Level and Bandwidth on Speech-Evoked Envelope Following Responses in Adults With Normal Hearing. Ear and Hearing. 36(6):619-34. doi: 10.1097/AUD.0000000000000188.
Easwar V, Beamish L, Aiken S, Choi JM, Scollie S, Purcell D. (2015) Sensitivity of envelope following responses to vowel polarity. Hear Res. 320:38-50. doi: 10.1016/j.heares.2014.11.008.