Supplemental Video

Supplemental Movie: A salt-hungry rat displays highly motivated, stereotyped ingestive behavior when given access to a highly concentrated saline solution (3% NaCl, roughly the concentration of seawater). Eight days prior, this animal was switched to a low-sodium chow (0.01% Na) with no access to saline. Infrared (night-vision) recording was used to observe this nocturnal species while fully awake and alert, allowing a more consistent behavioral response. Elapsed time after return of the 3% NaCl drinking tube is shown on the lower-right.

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