Year: 2015
Type: dissertation
Abstract: Transcranial Doppler ultrasound (TCD) is an imaging technique used to assess cerebral blood flow velocities (CBFV) and can be used to develop a brain computer interface (BCI). Generally in right-handed individuals, verbal cognitive tasks elicit a greater increase in CBFV in the left hemisphere in comparison to the right while spatial tasks result in greater blood flow to the right hemisphere. Previous TCD-BCI systems have used verbal and spatial tasks as control signals; however, the spatial task required a visual cue, which is not feasible for those with visual impairments and restricts the BCI to a system-paced paradigm. Therefore, new right-side lateralized tasks that do not require visual cues were investigated and evaluated as control signals in an online three-class TCD-BCI system. An average online accuracy of 62.4±10.8% (n=10) and information transfer rate of 1.08±0.69 bits/min was achieved. These results demonstrate the feasibility of a user-paced, vision-free, online TCD-BCI system.
Source: TSpace (University of Toronto)
Author: Anuja Goyal
Language: English
Subfield: Cognitive Neuroscience
Field: Neuroscience
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W2563423322