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Tactile memory and discrimination of outdoor winter bees, summer nurse bees and summer foragers. The x-axis displays the tested stimuli (conditioned vertical pattern (CS) or new horizontal pattern) at 5 min, 24 h or 48 h after conditioning. The y-axis shows the percentage of bees displaying the proboscis extension response (PER). For statistics see text. The same individuals as in Figure 2 are displayed minus individuals that did not survive the 48-h test.
