“…For example, noise from external sources such as aircraft and road traffic have been found to be associated with annoyance, speech interference, and vocal efforts among teachers (Crook & Langdon, 1974;Ko, 1979;Sargent, Gidman, Humphreys, & Utley, 1980). Similarly, some studies have reported increased vocal efforts (Åhlander et al, 2011;Pekkarinen, Himberg, & Pentti, 1992;Pekkarinen & Viljanen, 1991) and distraction and annoyance (Enmarker & Boman, 2004;Kristiansen, Lund, Nielsen, Persson, & Shibuya, 2011;Lundquist, Holmberg, Burström, & Landström, 2003;Lundquist, Holmberg, & Landström, 2000;Skarlatos & Manatakis, 2003) related to internal noise sources and high RT. Thus, the available evidence suggests that poor acoustical working conditions have several negative effects on teachers, and although none of the studies provide direct evidence, there are reasons to believe that poor acoustical working conditions may have consequences for their job commitment and job satisfaction.…”