Horses show left-eye preference in relation to people
August 10, 2009
Horses generally prefer to scan people with their left eye, researchers have found.
The findings appear to provide a sound basis for mounting a horse from the left.
Researchers Kate Farmer, Konstanze Krueger and Richard Byrne said most horses have a side on which they are easier to handle and a direction they favour when working on a circle.
Recent studies have suggested a correlation between emotion and visual laterality - the preference for one side over the other - when horses observe inanimate objects.
As such, the localisation of function on one side of the brain could provide important clues regarding the horse's cognitive processes.
The team, whose findings have just been published in the Journal of Animal Cognition, set out to explore whether horses also showed a right or left side preference in association with people.
"We gave horses the choice of entering a chute to left or right, with and without the passive, non-interactive presence of a person unknown to them.
"The left eye was preferred for scanning under both conditions, but significantly more so when a person was present.
"Traditionally, riders handle horses only from the left, so we repeated the experiment with horses specifically trained on both sides.
"Again, there was a consistent preference for left eye scanning in the presence of a person, whether known to the horses or not.
"We also examined horses interacting with a person, using both traditionally and bilaterally trained horses. Both groups showed left eye preference for viewing the person, regardless of training and test procedure.
"For those horses tested under both passive and interactive conditions, the left eye was preferred significantly more during interaction.
"We suggest that most horses prefer to use their left eye for assessment and evaluation, and that there is an emotional aspect to the choice which may be positive or negative, depending on the circumstances."
The researchers said they believed the results have important practical implications and that emotional laterality should be taken into account in training methods.