(IMAGE)
Caption
The level of motivation of the fruit fly Drosophila can be deduced on the basis of whether it attempts to climb over gaps it encounters when walking. In a depression-like state, the fruit fly is less likely to do so. In the background are leaves of Centella asiatica, the Indian pennywort.
Credit
photo/©: Helen Hovoet, Hans-Hermann Huber
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CC BY-NC-ND