Numerical Cognition Without Words: Evidence from Amazonia

TLDR

The Pirahã tribe uses a limited “one‑two‑many” counting system. The study investigates whether Pirahã speakers can perceive large numerosities without linguistic counting, probing the Whorfian hypothesis that language shapes numerical cognition. Results show that without a counting system, Pirahã speakers perform poorly on quantities above three, yet exhibit a consistent coefficient of variation indicative of an analog estimation process.

Abstract

Members of the Pirahã tribe use a "one-two-many" system of counting. I ask whether speakers of this innumerate language can appreciate larger numerosities without the benefit of words to encode them. This addresses the classic Whorfian question about whether language can determine thought. Results of numerical tasks with varying cognitive demands show that numerical cognition is clearly affected by the lack of a counting system in the language. Performance with quantities greater than three was remarkably poor, but showed a constant coefficient of variation, which is suggestive of an analog estimation process.