An alternative interpretation of the stimulus suffix effect.

Area of Science:

• Cognitive Psychology
• Human Memory Research

Background:

• The stimulus suffix effect, a phenomenon where a final item presented after a list interferes with recall, has been extensively studied in serial recall tasks.
• Previous research indicates that the suffix effect primarily impacts the recall of ordered information.

Purpose of the Study:

• To investigate the influence of a stimulus suffix on both yes-no recognition and probe-recall memory tasks.
• To determine if the suffix effect is specific to tasks requiring order information or if it affects item information as well.

Main Methods:

• Participants completed yes-no recognition and probe-recall tasks after being presented with lists of stimuli.
• The presence or absence of a stimulus suffix following the lists was manipulated.
• Performance was measured by accuracy and recall accuracy in both task types.

Main Results:

• A significant suffix effect was observed in the probe-recall task, consistent with prior findings in serial recall.
• No significant suffix effect was found in the yes-no recognition task.
• Probe-recall requires retention of both item and order information, while recognition primarily relies on item information.

Conclusions:

• The findings support an interpretation of the suffix effect as primarily an interference with the retention of order information.
• The absence of a suffix effect in recognition suggests that item information alone is less susceptible to this type of interference.
• This study differentiates the mechanisms underlying different memory tasks and their susceptibility to interference.