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Pecking locations of two keas, K11 (unbroken line), using a recency strategy, and K4 (dashed), employing a primacy strategy. The shortest horizontal “step” corresponded to 32 pixels on the screen (approximately 9 mm) and approximates the width of a single tile. Dark and light gray areas denote the minimum and maximum stimulus size, respectively. The vertical axis measures the total number of pecks per bird within the corresponding 32 pixel window.
