Journal: bioRxiv
Article Title: Neurons in the Human Substantia Nigra Respond to Cognitive Boundaries and Predict Memory
doi: 10.64898/2026.02.04.703556
Figure Lengend Snippet: (a) Microelectrode recording locations of overlap cells plotted in MNI space and color-coded by subtype (type-I, green; type-II, purple). To pool hemispheres, left-hemisphere sites are mirrored to the right by taking the absolute value of the lateral (X) coordinate. SNc and SNr are shown in dark gray and light gray, respectively. (b) Mean spike waveform (± s.d.) for representative type-I (green) and type-II (purple) overlap cells. (c) Spike width, defined as the time between the two positive peaks of the waveform, for type-I and type-II overlap cells. (d) Mean firing rate across the entire recording session for type-I and type-II overlap cells. (e) Baseline-normalized (z-scored) firing rates in a 1-second window following novel image onset, shown separately for trials in which novel images were correctly judged “new” versus misclassified as “old,” for type-I and type-II overlap cells. (f) Baseline-normalized (z-scored) firing rates in a 1-second window following cognitive boundaries, shown separately for trials in which familiar images were correctly judged “old” images versus misclassified as “new,” for type-I cells and type-II overlap cells.
Article Snippet: Microelectrode recording was conducted with a single tungsten microelectrode (400-700 kOhm, Neuroprobe, Alpha Omega, Israel) driven through the central passage on the electrode holder (Bengun, Alpha Omega, Israel) into the target area by a microdrive (Drive Headstage, Alpha Omega, Israel) with a step size of 100-200 μm.
Techniques: