Each participant will be fitted with the noise reduction program on the same hearing aid. The principle of the noise reduction algorithm is to remove noise from a speech signal with the aim of improving the speech intelligibility and comfort.

Each participant will be fitted with a second noise reduction program on the same hearing aid. The parameterization of this NR algorithm differs from that in NR(1).

Performance on the secondary tracking task will be analysed in order to observe whether there is a dual-task cost associated with performing both tasks simultaneously. Typically the level of degradation on the secondary task is thought to reflect an increased listening effort (provided that the primary task performance remains stable). Accordingly, success on the primary task will also be monitored and used in analyses (speech intelligibility in [%] correct). For the Secondary task performance the reaction time [ms] will be analysed.

Performance on the secondary tracking task will be analysed in order to observe whether there is a dual-task cost associated with performing both tasks simultaneously. Typically the level of degradation on the secondary task is thought to reflect an increased listening effort (provided that the primary task performance remains stable). Accordingly, success on the primary task will also be monitored and used in analyses (comprehension questions [numbers] correct after listening to radio excerpts). For the Secondary task performance the reaction time [ms] will be analysed.

Subjective Listening Effort will also be assessed through self-reported individual listening effort on a 14 point scale from "only noise" to "no effort" after each auditory task.