Assertion: orangutan's thumb | /r/RelatedTo | square-shaped stimulus
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Source sentences:
text: In the Arbitrary–Gesture condition, the keeper produced either a ‘high five’ (open right hand with the palm towards the subject) or a ‘thumbs up’ (closed right hand except the thumb finger that is erected) gestural signal, and subjects had to learn that ‘high five’ was associated with a cross-shaped stimulus whereas ‘thumb up’ was associated with a square-shaped stimulus ( Figure 4 ).