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Fig. 2. Results of Expt 1, colour discrimination. Bees were trained with a blue
square (positive) versus a yellow square (negative) presented on a
white background. The trained bees are then tested with various pairs of
coloured triangles as specified along the abscissa; bl, blue; yel, yellow; gr,
green; viol, violet. The bars showing the choice frequencies (Cfs) obtained in
favour of each of the two triangles are coloured accordingly. The total number
of choices (N) recorded with each pair of triangles is given above
each pair of bars.
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