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Exploration of empty holeboard inhibits LTD. (a) Concurrent with LFS, the animals were either exposed to an empty holeboard (white box) or a holeboard containing objects (black box). (b) Analog traces (Upper) represent levels before, after, and 24 h after LFS from a rat exposed to the empty holeboard. (Lower) Traces recorded from an experiment with an object-containing holeboard. Vertical scale bar corresponds to 0.5 mV, and horizontal bar corresponds to 5 ms.
