Psychologists studied how 28 horses reacted to seeing photographs of positive versus negative human facial expressions.

When viewing angry faces, horses looked more with their left eye, a behaviour associated with perceiving negative stimuli.

The study, published in the journal Biology Letters, concluded that this response indicates that the horses had a functionally relevant understanding of the angry faces they were seeing.

For the experiments, the horses were shown happy and angry photographs of two unfamiliar male faces. The experimental tests examined the horses' spontaneous reactions to the photos, with no prior training.


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