Monkeys can count! Researchers report a study on macaques that suggests humans may not be the only animal that can do math. From New Scientist:
(Utah State University psychologist Kerry) Jordan and colleague Elizabeth Brannon, of Duke University in Durham, North Carolina, US, trained two eight-year-old female macaques to equate beeps to dots on a computer screen. So if a monkey heard seven beeps, it knew to tap a square on the screen displaying seven dots.Monkeys can count
Next, the researchers tested the monkeys’ training in adding dots and beeps together.
The animals were presented dots of different sizes flash onto a screen. At the same time they heard a series of short tones.
To determine if the monkeys could combine the two, Jordan and Brannon showed the animals a screen with two numerical choices, represented as dots – one the correct sum, one incorrect.
Both monkeys did better than 50:50 – one added the sights and sounds correctly 72% of the time, the other 66% of the time.