The effects of absolute and relative masker duration were investigated using one- and two-tone forward maskers. In the absolute-duration conditions, the duration (D) of a one-component on-frequency (Mx; DmX-alone) or off-frequency (M2; Dml-alone) masker or the common duration of a two-component masker (DmX = Dml) was varied. Masked threshold increased as duration increased in all three conditions. In the relative-duration conditions, the duration of one masker component was fixed at a relatively long value and the duration of the other component was varied (DmX Dml or Dml DmX). In the DmX Dml condition, masked threshold decreased as the duration of Dml was increased. In the Dml DmX conditions, masked threshold increased and then decreased slightly as the duration of DmX was increased. Masked threshold was frequently lower in the Mx+M2 than in the Afralone conditions, indicating psychophysical suppression. Further, masked threshold in the Dm2 DmX condition was always higher than in the corresponding absolute-duration condition (DmX= Dml) having the same Mx duration, indicating masker enhancement. A two-stage neural model was proposed to account for these forward-masking data.
ASJC Scopus subject areas
- Arts and Humanities (miscellaneous)
- Acoustics and Ultrasonics