Fig. 6: Deep, simultaneous recordings from two face patches in the IT cortex.
From: Large-scale high-density brain-wide neural recording in nonhuman primates
a, Simultaneous targeting of two face patches. Coronal slices from MRI show inserted tungsten electrodes used to verify targeting accuracy for subsequent recordings using Neuropixels 1.0 NHP (top, face-patch ML; bottom, face-patch AF). Yellow overlays illustrate functional MRI contrast in response to faces versus objects. b, Response rasters for a single stimulus presentation of simultaneously recorded neurons in ML and AF to a monkey face, presented at t = 0. Each line in the raster corresponds to a spike from a single neuron or multi-unit cluster, including both well-isolated single units and multi-unit clusters. c, Neuropixels 1.0 NHP enabling recordings from many face cells simultaneously. These plots show the average responses (baseline subtracted and normalized) of visually responsive cells (rows) to 96 stimuli (columns) from 6 categories, including faces and other objects. Bottom, exemplar stimuli from each category. The plots included 438 cells or multi-unit clusters in ML (left) and 689 in AF (right), out of which a large proportion responded selectively to faces. Units were sorted by channel, revealing that face cells are spatially clustered across the probe. d, Coronal slice of MRI of Neuropixels probe targeting the deepest IT face-patch AM. The thick shadow is a cannula that was inserted through the dura into the brain. The thin shadow corresponds to the Neuropixels trajectory. e, Same as c, for face-patch AM, recorded in a different session.
