We discussed several experiments examining the influence of masker levels and masker bandwidths on masking effects and suppression effects in backward and forward masking. The differences in masking effect and suppression effect observed in backward and forward masking were consistent with an interpretation that suppression resulted from a reduction of the effective level of first masker and masking was dominated by additional masking effect on higher second masker level.
This conclusion of relation between masking and suppression processes were supported by a theoretical treatment.