Before revision:  Two immersive displays were tested , a curved screen (CS) and a head-mounted display (HMD) , combined with three visual conditions (audio-only, virtual characters and video recordings) . Three groups of participants were tested: seventeen young normal-hearing, eleven older normal-hearing and ten older hearing-impaired  with hearing aids.
After revision:  Two immersive displays were tested , a curved screen (CS) and a head-mounted display (HMD) , combined with three visual conditions (audio-only, virtual characters and video recordings) , three groups of participants were tested: seventeen young normal-hearing, eleven older normal-hearing and ten older hearing-impaired with hearing aids.