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Kraus, Benjamin J.; Brandon, Mark P.; Robinson, Robert J.; Connerney, Michael A.; Hasselmo, Michael E.; Eichenbaum, Howard
Neuron (Cambridge, Mass.), 11/2015, Letnik: 88, Številka: 3Journal Article
The spatial scale of grid cells may be provided by self-generated motion information or by external sensory information from environmental cues. To determine whether grid cell activity reflects distance traveled or elapsed time independent of external information, we recorded grid cells as animals ran in place on a treadmill. Grid cell activity was only weakly influenced by location, but most grid cells and other neurons recorded from the same electrodes strongly signaled a combination of distance and time, with some signaling only distance or time. Grid cells were more sharply tuned to time and distance than non-grid cells. Many grid cells exhibited multiple firing fields during treadmill running, parallel to the periodic firing fields observed in open fields, suggesting a common mode of information processing. These observations indicate that, in the absence of external dynamic cues, grid cells integrate self-generated distance and time information to encode a representation of experience. •Time and distance coding by grid cells can be studied in rats running in place•In this task, grid cell activity reflects a combination of time and distance coding•Grid cells are more sharply tuned to time and distance than non-grid cells•Many grid cells exhibit multiple time and distance fields Grid cells encode a periodic array of locations occupied as rats move through space. Kraus et al. show that, when cues about motion through locations are eliminated, grid cells integrate self-generated distance and time information that predominate in that experience.
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