Extended Data Fig. 5: Task manifold and neural manifold encode different variables.
From: Geometry of abstract learned knowledge in the hippocampus
a, The visual space of the accumulating towers task across a representative session. Top, the mean luminance of the virtual-reality visual field as a function of position in the T-maze. Bottom, four example frames. Note the high variability of luminance during the cue period, where bright towers are randomly presented on the left and right walls. b, Performing dimensionality reduction on the time series of the pixel values in the raw video stream using MIND reveals a low-dimensional manifold, reflecting the visual sensory structure of the accumulating towers task. Plotting luminance (top) and evidence (bottom) on the manifold reveals that luminance is represented as a smooth gradient, whereas evidence requires memory and is thus absent on the task manifold. c, Same as in b, but showing the neural manifold obtained from the mouse that ran the session (Fig. 3f). Note the absence of a luminance representation, but the emergence of evidence.
