The lag effect and differential organization theory: nine failures to replicate

Area of Science:

• Cognitive Psychology
• Memory Research

Background:

• Previous studies suggested a 'monotonically increasing lag effect' in free recall memory.
• This effect was often explained by differential organization in memory.

Purpose of the Study:

• To replicate and extend previous findings on the monotonically increasing lag effect.
• To investigate the boundary conditions of this memory phenomenon.

Main Methods:

• Conducted nine experiments involving 918 observations.
• Tested performance on items repeated at three different lags in free recall tasks.

Main Results:

• Failed to observe the monotonically increasing lag effect in any experiment.
• Mean free recall performance varied by less than one percentage point across lags.
• The lag effect was not reliably detected under the tested conditions.

Conclusions:

• The monotonically increasing lag effect in free recall may have limited generalizability.
• Existing evidence supporting a differential organization explanation for this effect should be viewed with caution.
• Further research is needed to understand the conditions under which the lag effect occurs or fails to occur.