EFFECTS OF TELEPHONE RING ON TWO MENTAL TASKS RELATIVE TO AN OFFICE

In many cases, there are a lot of noise sources in an office and particularly, telephone ringing often irritates the office workers. Effects of aircraft noise on the mental work of pupils were reported by Ando et al.[1]. In spite of its serious effect, it has not yet been found how the physical parameters of the wave form influence the perception of noise. The purpose of this study is to investigate the effects of telephone ringing on two mental tasks. This investigation is based on the human auditory–brain model consisting of the auto-correlation function (ACF) of sound source, the interaural cross-correlation function (IACF) for sound signals arriving at the two ears, and the specialization of the cerebral hemispheres. Under the stimulus of a telephone ringing, an adding task and a drawing task were performed. Results show that telephone ringing influences differently the two tasks: the V-type relaxation was observed only during the drawing task. It is revealed that the interference effect between the drawing task and the noise may occur in the right hemisphere.