Interference in memory by process or content? A reply to Neath (2000).

The approach to the irrelevant sound effect by Neath (2000) is discussed in terms of the contrast between content-based and process-based interference. Four themes are highlighted: First, problematic features of the feature model are highlighted; second, results not considered by Neath are presented; third, empirical underpinnings of the feature model not related to the irrelevant-sound effect are questioned; last, the parsimony of the feature model is questioned. The balance of the evidence seems to be in favor of a process-based approach, on the grounds that it provides a comprehensive account of acoustic and task-based factors within the irrelevant sound effect, for both speech and nonspeech sound.