The Claim
Rhesus monkeys exhibit similar behavioral responses to overhand and underhand throwing motions, even in the absence of prior exposure to underhand throws, indicating that their threat recognition is driven by biomechanical features rather than learned motor patterns.
What the research says
Roughly balanced
Support and challenge are close. The picture may shift as more studies come in.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Rhesus monkeys react the same way to two different types of throws, even if they have never seen one of them before, because their brains recognize the motion patterns, not because they learned what each throw means.
See the scientific wording
Rhesus monkeys respond similarly to overhand and underhand throwing motions, despite never having experienced underhand throws, suggesting their threat recognition is based on biomechanical features rather than learned associations with specific motor patterns.
When an object moves through the air in a fast, arcing path, the brain detects this specific motion pattern and automatically treats it as a threat, even if the person throwing it used a motion the animal has never seen before.
What the research says
1 studyMonkeys don’t throw, but they still get scared when they see someone throw something—even if it’s a weird underhand toss they’ve never seen before. That means they’re not just learning from experience; they can tell it’s dangerous by how it moves.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.