Working memory still needs verbal rehearsal.

Area of Science:

• Cognitive Psychology
• Neuroscience
• Working Memory Research

Background:

• The role of verbal rehearsal in working memory maintenance is debated.
• Alternative models, like SOB-CS, propose distractor removal rather than active maintenance.
• This challenges traditional views of verbal working memory.

Purpose of the Study:

• To test if working memory performance can be explained without a causal role for verbal rehearsal.
• To investigate the impact of repeated distractors on verbal and spatial memory.
• To evaluate the explanatory power of the SOB-CS model versus rehearsal-based accounts.

Main Methods:

• Two experiments were conducted using a complex span task and a Brown-Peterson paradigm.
• Participants performed concurrent memory tasks while exposed to repeated verbal distractors ('ba').
• The effect of distractor repetition on consonant and spatial location memory was analyzed.

Main Results:

• Increasing repetitions of the verbal distractor ('ba') detrimentally affected concurrent consonant maintenance.
• Maintenance of spatial locations remained unaffected by the repeated verbal distractors.
• The SOB-CS model struggled to account for these findings without additional, unsupported assumptions.

Conclusions:

• The results support a maintenance mechanism based on verbal rehearsal.
• Concurrent articulation appears to impede this rehearsal process.
• The hypothesis of verbal rehearsal being essential for working memory remains the most parsimonious explanation.