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
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Brain in active perception: Bloom & Lazerson, 1998
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Scalp EEG
Blink artifact
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Structural MRI with 64 electrodes
WJF courtesy of Jeff Duyn at NIH and Thomas Witzel at MIT
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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
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Cat & Rabbit brains
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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
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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
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Difference of scale is 33:1
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Mus musculus
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Beluga whale
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Whale and mouse brains
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Mouse and whale EEG
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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.