brain in active perception: bloom & lazerson, 1998
DESCRIPTION
Brain in active perception: Bloom & Lazerson, 1998. Scalp EEG. Blink artifact. Structural MRI with 64 electrodes. WJF courtesy of Jeff Duyn at NIH and Thomas Witzel at MIT. Scalp recording with high density linear array. Extracranial arrays. - PowerPoint PPT PresentationTRANSCRIPT
Brain in active perception: Bloom & Lazerson, 1998
Scalp EEG
Blink artifact
Structural MRI with 64 electrodes
WJF courtesy of Jeff Duyn at NIH and Thomas Witzel at MIT
This photographic montage shows the pial surface of my ‘brain in a vat’,
projected to the scalp. Gyri are light, sulci dark. EEG were from 64 electrodes.
Scalp recording with high density linear array
Walter J Freeman University of California at Berkeley
From Freeman et al. 2003
Extracranial arrays
Cat & Rabbit brains
Electrode arrays on rabbit brain
Left hemisphere of the rabbit brain with size and locations of 8x8 electrode arrays:rectangles 6x6 mm, spacing 0.8 mm.
The circles show typical sizes of activity domains.
Diameter: modal 15 mm, 95% inclusion 28 mm
Walter J Freeman University of California at Berkeley
EEG from 8x8 pial array, rabbit auditory cortex.Spacing: 0.79 mm 1st component PCA: 94%
Digitizing step: 2 ms Nyquist frequency: 250 Hz
8x8 recording in waking rabbit
Difference of scale is 33:1
Mus musculus
Beluga whale
Whale and mouse brains
Mouse and whale EEG
Acknowledgements
Walter J Freeman University of California at Berkeley40
The olfactory system
Walter J Freeman
End note
AcknowledgmentsThis work was supported by grants from NIMH (MH-06686), ONR (N00014-93-1-09380, and NSF (EIA-0130352). Human EEG and EMG data were collected and edited by Mark D. Holmes and Sampsa Vanhatalo in the EEG Clinic, Harborview Hospital, University of Washington, Seattle, and analyzed in the Dep’t of Molecular & Cell Biology in the University of California at Berkeley. Data processing and programming were by Linda Rogers and Brian Burke. The animal data were collected in collaboration withJohn Barrie, Mark Lenhart, and Gyöngyi Gaál.