Improving the Performance of SSVEP BCI with Short Response Time by Temporal Alignments Enhanced CCA
Steady State Visual Evoked Potentials (SSVEP) based Brain Computer Interface (BCI) provides high throughput in communication. In SSVEP BCI, typically, higher accuracy can be achieved with a relatively longer response time. It is therefore a research topic to reduce the response time while keeping high accuracy. We propose a new method, temporal alignments enhanced Canonical Correlation Analysis (TACCA) followed by a decision fusion to improve classification accuracy with short response time. TACCA exploits linear correlation with non linear similarity between steady state responses and stimulus frequencies. We compare TACCA and three state of the art methods using data from 54 subjects with response time ranging from 0.5 to 4 seconds. The evaluation results show that TACCA yields mean significant accuracy increase of 10 30% in all segment lengths, especially for the shorter time segment. One way ANOVA tests show high significant differences between single and multiple phases in TACCA performance.
2019 9th International IEEE/EMBS Conference on Neural Engineering (NER)