October 30, 1998

Monkeys Can Learn Quantities 1 to 9, Scientists Report

By VINCENT KIERNAN

Rhesus monkeys are able to learn to distinguish the quantities one through nine, researchers at Columbia University report in the October 23 issue of Science.

The researchers first taught two monkeys to distinguish the quantities one through four, represented by groups of shapes on a computer screen. Without further instruction, the monkeys then were able to recognize those four quantities, as well as the

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