Reward-enhanced encoding improves relearning of forgotten associations.

Area of Science:

• Cognitive Neuroscience
• Neurobiology of Learning and Memory

Background:

• Monetary incentives are known to improve memory consolidation and reduce forgetting.
• The effect of initial reward on the recovery of previously forgotten memories remains unexplored.

Purpose of the Study:

• To investigate the influence of monetary reward on the later relearning of forgotten associative memories.
• To determine if initial reward prospect can facilitate the retrieval of information no longer accessible through explicit recall.

Main Methods:

• Nineteen healthy participants learned object-location associations, with half receiving monetary rewards.
• Memory retention was assessed six weeks later via a declarative memory test.
• Relearning speed for rewarded versus non-rewarded associations was compared in the absence of reward.

Main Results:

• Most learned associations were forgotten after six weeks, as indicated by declarative memory tests.
• Relearning was significantly faster for associations that were initially rewarded, despite no reward during relearning.
• This suggests that reward-associated memories may persist in a latent state.

Conclusions:

• Associative memories encoded under monetary reward motivation can remain accessible in a latent form, even after explicit retrieval fails.
• Reward-induced memory facilitation might be linked to mechanisms like the renewal effect, influencing arousal and relearning.
• Past reward prospect can aid memory recovery, offering valuable insights for learning and educational strategies.