2-DG autoradiographs of the interpositus (IP), from three rats, showing relative rates of glucose utilization in pseudocolor (see color bar). The left hemisphere is on the left. These horizontal sections are approximately 3.9 mm above the interaural line (Paxinos & Watson, 1998). Panel (a) is an unpaired animal, panel (b) is a delay animal and panel (c) is a trace animal. Original autoradiographs are shown as an example of differences in the IP 2-DG uptake but individual autoradioagraphs may show variations in optical density of other structures. Scale bar indicates 1 mm. Abbreviations: AIP, anterior interpositus; PIP, posterior interpositus. (For interpretation of the references in color in this figure legend, the reader is referred to the web version of this article.)