perception

https://en.wikipedia.org/wiki/Electrophysiology

brain–computer interface

event-related potential
http://erp-lab.blog.ntu.edu.tw/如果你不知道什麼是event-related-potentials/

brainwave

DEAP: A Database for Emotion Analysis
http://www.eecs.qmul.ac.uk/mmv/datasets/deap/

1. wavelet transform:
 (1) epsilon waves / infra-low waves (0 to 0.5 Hz)
 (2) delta waves (0.5 to 3 Hz)
 (3) theta waves (3 to 8 Hz)
 (4) alpha waves (8 to 12 Hz)
 (5) beta waves  (12 to 38 Hz)
 (6) gamma waves (38 to 42 Hz)
2. feature: mean, standard deviation, median, entropy, skewness, kurtosis
3. classification: LSTM neural network

nerve impulse

bionic arms

bionic eye

https://twin-cities.umn.edu/news-events/research-brief-researchers-3d-print-prototype-bionic-eye

hearing aid

http://naplab.ee.columbia.edu/nnaad.html

electronic skin