Researchers comparing the signing of deaf early and late learners of Swiss German Sign Language were struck by the difference in the production of signs by two groups of signers. Specifically that the signing of early learners was easier to watch and understand, because it was more rhythmic. Analyses were made of temporal aspects of the production…

The natural sign language used by deaf children in Poland makes no distinction between present, future, and past tenses. Deaf pupils do not understand the notions of temporal sequence and duration of time intervals, and so are prevented from thinking of and planning for the future. The study with 15 deaf 12-year-old pupils and 15 deaf 14-year-old…

This document describes the contributions of African peoples to the science of mathematics. The development of a number system is seen as related to need. Names of numbers, time reckoning, gesture counting, and counting materials are examined. Mystical beliefs about numbers and special meanings in pattern are presented. Reproductions of patterns,…