Decomposing the multiple encoding benefit in visual long-term memory: Primary contributions by the number of encoding...

Area of Science:

• Cognitive Psychology
• Neuroscience

Background:

• Visual long-term memory (VLTM) capacity is vast but can be limited by visual working memory (VWM) during encoding and retrieval.
• Repeated encoding of information can improve VLTM performance, known as the multiple encoding benefit (MEB).

Purpose of the Study:

• To disentangle the factors contributing to the MEB, specifically the number of encoding opportunities, VWM representations, and retrieval success.
• To investigate the underlying mechanisms of the MEB using behavioral data and EEG correlates.

Main Methods:

• Two experiments were conducted where participants encoded a varying number of identical objects across multiple opportunities.
• Behavioral recognition memory performance was recorded.
• Electroencephalography (EEG) was used to examine posterior alpha suppression and negative slow wave, indicators of VWM representations.

Main Results:

• Recognition memory performance significantly improved with an increased number of encoding opportunities.
• This improvement was not solely attributable to a higher number of encoded VWM representations or increased retrieval success.
• EEG data supported the behavioral findings, indicating the primary role of encoding opportunities.

Conclusions:

• The number of encoding opportunities is the main driver of the multiple encoding benefit in visual long-term memory.
• The findings clarify the interplay between VWM and VLTM, highlighting the importance of repeated exposure for memory consolidation.