Figure 1.

Thermocline design. (a) Computer-generated schematic of the thermocline showing the Peltier junctions with heat sinks and slots for lane dividers. (b) Photograph of the constructed thermocline showing the control panel and twelve divided lanes, including markings to aid habituation of the mice to the temperature gradient. (c) Thermal camera−generated image of the functioning thermocline with freely behaving mice. The numbers on the right reflect the temperature range represented in the image. The number in the upper left corner reflects the temperature at the crosshairs.