electroencephalography (eeg) nehorai/eegmeg/eeg2.jpgnehorai/eegmeg/eeg2.jpg,
TRANSCRIPT
Electroencephalography (EEG)
http://ese.wustl.edu/~nehorai/eegmeg/eeg2.jpg, http://www.gtec.at/service/images/10_20_system_mod.gif
http://www.electropsychology.com/valovi.gif, http://en.wikipedia.org/wiki/Electroencephalography
8-12 Hz (awake, but relaxed, attenuated w/ activity)
mu alpha having to do w/ motion
12-30 Hz (Low amplitude w/ multiple/varying freq when thinking)
up to 3 Hz (sleep and babies)
4-7 Hz (kids and meditation)
26-100 Hz
raw EEG
http://www.sciencephoto.com/media/229176/enlarge
http://www.wtec.org/bci/welcome.html
Wolpaw, PNAS 101(51), 2004, 17849-17854
Fig. 1
C3=L C4=R
nose
(24 Hz)
(12 Hz)
Wolpaw, PNAS 101(51), 2004, 17849-17854
Fig. 1
beta mu (alpha)
C3=L C4=R
nose
3&42&51&67&8
1&23&84&75&6
C3 C4
Wolpaw, PNAS 101(51), 2004, 17849-17854
Table 1
• http://www.pnas.org/content/suppl/2004/12/07/0403504101.DC1/03504Movie1.mov
Movie 1. Two-dimensional cursor control with scalp-recorded sensorimotor rhythms. In this QUICKTIME movie, a person with spinal cord injury (i.e., user A) uses scalp-recorded sensorimotor rhythms to control cursor movement in two dimensions. In each trial, a target appears at one of eight possible locations on the periphery of the screen, and 1 sec later, the cursor appears in the center and moves. Its vertical movement is controlled by the sum of the weighted amplitudes of a 24-Hz beta rhythm recorded from the scalp over left and right sensorimotor cortices, and its horizontal movement is controlled by the difference between the weighted amplitudes of a 12-Hz mu rhythm recorded over left and right sensorimotor cortices, as described in Methods.
Wolpaw, PNAS 101(51), 2004, 17849-17854
Fig. 2
Wolpaw, PNAS 101(51), 2004, 17849-17854
Fig. 3
Wolpaw, PNAS 101(51), 2004, 17849-17854
Fig. 4
Looking into the future….
http://www.londonyogi.com/images/spine.jpg
They use more channels and more frequencies….and tailor it for different users
Hochberg, et al. Neuronal ensemble control of prosthetic devices by a human with tetraplegia, Nature, 44(13), 2006 p164-171.
Fig. 1
Hochberg, et al. Neuronal ensemble control of prosthetic devices by a human with tetraplegia, Nature, 44(13), 2006 p164-171.
Fig. 2
Hochberg, et al. Neuronal ensemble control of prosthetic devices by a human with tetraplegia, Nature, 44(13), 2006 p164-171.
Fig. 2
Hochberg, et al. Neuronal ensemble control of prosthetic devices by a human with tetraplegia, Nature, 44(13), 2006 p164-171.
Fig. 3
Hochberg, et al. Neuronal ensemble control of prosthetic devices by a human with tetraplegia, Nature, 44(13), 2006 p164-171.
Fig. 3
Hochberg, et al. Neuronal ensemble control of prosthetic devices by a human with tetraplegia, Nature, 44(13), 2006 p164-171.
Fig. 4
• Not the original video… but close• http://
www.veoh.com/watch/v17476140kmJjEhTs
Hochberg, et al. Neuronal ensemble control of prosthetic devices by a human with tetraplegia, Nature, 44(13), 2006 p164-171.
Fig. 5
Hochberg, et al. Neuronal ensemble control of prosthetic devices by a human with tetraplegia, Nature, 44(13), 2006 p164-171.
Fig. 6