Sign Language (image) National Science Foundation Share Print E-Mail Caption Researchers conclude this is because they are not being taught numbers or number words. Here, American sign language for "three," "seven" and "eight" are shown. Credit © 2011 Jupiterimages Corporation Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.