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Introduction to EEG • Delta waves – 0.1 – 4 Hz – Dominant in sleep stages 3 and 4 • Theta Waves – 4 – 8 Hz – Important in memory and emotion • Alpha waves – 8 – 13 Hz – Wakefulness and related to relaxed, conscious and inactive state • Beta waves – 13 – 36 Hz • Gamma waves – above 36 Hz 2016/7/13 1 Introduction to EEG 2016/7/13 2 http://students.iitk.ac.in/projects/brain_braindecoding Introduction to EEG Type Frequency Location Use Delta <4 Hz everywhere occur during deep sleep, coma Theta 4-7 Hz temporal and parietal correlated with emotional stress (frustration & disappointment) Imaginative state, drowsiness Alpha 8-12 Hz occipital and parietal reduce amplitude with sensory stimulation or mental imagery Beta 12-40 Hz parietal and frontal can increase amplitude during intense mental activity, attention and focus Mu 9-11 Hz frontal (motor cortex) diminishes with movement or intention of movement 2016/7/13 3 Mind Controlled Computer Neural Prosthetics Man Controls Prosthetic Hand with Mind Cutting Edge Robotic Hand with Mind Driving with Your Tongue 2016/7/13 4 People with paralysis control robotic arms using brain-computer interface • BrainGate Research On Neural Prosthetics – People with paralysis control robotic arms using brain-computer interface – By implanting a 96-electrode sensor the size of a baby aspirin onto the surface of their brains, researchers have enabled two quadriplegic participants to use their thoughts alone to perform tasks with two types of robotic arms. 2016/7/13 5 6 Source: http://www.stanford.edu/~shenoy/GroupResearchOverview.htm