Intracranial electrophysiology (ICE) electrodes inside cranium, to guide surgery
Composite x-ray (face swapped), for patient's privacy. Connectors (upper right) lead to computer.
ICE data allow us to localize dipoles in time and within gyral convolution
Bipolar and reconstructed monopolar field lines lead to a detailed dipole model.
Placement of electrodes across cortex and averaged spectral power from each
Example electrode placement (see MRI), and time-frequency ICE data at each site (color rasters).
Subdural electrodes that are implanted on brain surface
Grid macro-electrodes of the type sometimes place in our patients. Images: AdTechMedical.com.
Reliability of the three electrophysiological components of grammatical inflection
Triphasic response in ICE data is consistent and statistically reliable across and within patients.
fMRI of the word reading and production nework
fMRI maps of regions engaged to read words and put in grammatical context. Click for more.
Picture of brain cells talking: Inter-region phase locking
Phase-locking between two sets of brain cells, suggests long-distance white matter connection.
ICE data from multiple electrodes in one patient’s brain
Evoked potentials and spectral power. Electrodes ordered vertically by when first activity began.
Intrancranial Electrophysiology (ICE): Three-Stage Response in Broca’s area
Discovery: small brain region process 3 different types of info at 3 different times, in 1/4 second.
Spectral analysis of ICE data recorded from V1
Time-Frequency plot of neural response to reading words in order to speak them. (c) Ned T. Sahin