Children were tested in year one, before sound attenuation work in the classrooms,
and in year two, after the installation of sound absorbent panels. In the quieter condition, children scored
higher than their noisier cohort on the letter^number^word recognition measure and were rated higher by
their teachers on the language scale. In addition, children in the quieter classrooms were less susceptible than
those in the noisy classrooms to induced helplessness.