Letters Interference: unique source of forgetting in working memory?

Brown [1] make a strong case against time-based accounts of forgetting in short-term andworkingmemory.We argue, however, that the interference-based account they favor is underspecified, that the time-loss functions predicted by time-based models are misconstrued and that the contra-dictory findings issued from the time-based resource-shar-ing (TBRS) model [2] are not properly addressed. First, it is often overlooked that interference-based theories are vague, as Lewandowsky et al. [1] themselves acknowledge when outlining outstanding questions. Some of the same authors have elsewhere argued that forgetting is caused by the overlap of features [3,4], but these features are poorly specified. For example, Lewandowsky et al. [1] deny that the disruptive effect of judging the spatial location of squares on themaintenance of letters [5] result