Affective surprise enhanced memory for item timing

What the study found: Affective surprise, defined as a dynamic change in felt emotion, was linked to stronger memory for when items occurred in a sequence. The study also found that effects on item recognition memory were inconsistent.

Why the authors say this matters: The authors conclude that affective surprise may act as a learning signal with consequences for episodic memory, and that it may help bind items to their temporal contexts in memory.

What the researchers tested: The researchers introduced a new way to compute affective surprise from participants’ continuous ratings of valence and arousal, which are measures of how positive or negative, and how activated, a feeling is. They reanalyzed one published dataset and ran an independent replication study in which participants encoded item sequences while listening to emotional music, then later listened again while giving continuous affect ratings.

What worked and what didn't: Greater affective surprise at a moment, or larger deviations from the recent history of ratings, enhanced memory for when an item occurred in a sequence after 24 hours. In contrast, effects on item recognition memory were inconsistent across the two studies.

What to keep in mind: The abstract does not describe specific limitations beyond the mixed recognition-memory findings. The summary is limited to the two studies and the 24-hour memory test described there.

Key points

• Affective surprise was associated with better memory for when items appeared in a sequence.
• The effect was based on changes in continuous valence and arousal ratings over time.
• Item recognition memory showed inconsistent effects across the two studies.
• The authors suggest affective surprise may function as a learning signal for episodic memory.
• The findings are based on a reanalysis and an independent replication study with emotional music.