Summary: New smartphone-based research is reshaping how scientists study memory by collecting real-world data on sleep, dreams, emotion, novelty, and daily experiences. Recent studies show that replaying memories before sleep, dreaming about recent events, encountering novel experiences, and feeling positive emotions all strengthen autobiographical memory and increase vividness and recall.
Mobile apps such as HippoCamera let researchers capture naturalistic memory traces outside the laboratory, revealing links between sleep-dependent consolidation, dream incorporation, and the vividness of everyday memories. These findings deepen our understanding of how memory works in daily life and suggest practical ways to improve memory retention.
Key Facts:
- Sleep and consolidation: Reviewing events before sleep or dreaming about them makes memories feel closer in time, more vivid, and easier to recall.
- Novelty amplifies memory: New experiences enhance recall not only for the novel event but also for other events that occur on the same day.
- Smartphone-enabled studies: Real-world memory tracking via smartphone apps produces rich, ecologically valid data about everyday autobiographical memory.
Source: Cognitive Neuroscience Society
Memory is not a straight line from event to recall. Instead, memories evolve, reorganize, and interact with sleep, emotion, and surrounding experiences. Cognitive neuroscientists are increasingly using smartphones to study these dynamics in real life rather than relying solely on lab tasks.
“Smartphones are an incredible tool for understanding patterns of feeling, behavior, and experience in daily life, and how different types of everyday events stay with us in memory,” says Elizabeth Goldfarb of Yale University. She is chairing a session at the Cognitive Neuroscience Society meeting focused on smartphone-based naturalistic memory research.
Researchers will present smartphone-based studies showing how everyday actions—trying something new, replaying memories before sleep, and experiencing strong emotions—can build richer, more durable autobiographical memories. Below are highlights from several research programs demonstrating how sleep, novelty, and emotion shape memory in the real world.
Memory replay and sleep
Morgan Barense and colleagues at the University of Toronto developed the HippoCamera smartphone app to capture memory, sleep, and dream reports in daily life. Their work was inspired by an unexpected finding: the timing of a memory review relative to sleep had a dramatic effect on later recall.
In studies using HippoCamera, participants recorded two meaningful events per day—one in the morning and one in the evening—over two weeks. Memory tests followed 12-hour delays that either included a night of sleep or a day spent awake. Results indicate that memories tested after sleep were rated as more vivid, feeling temporally closer, and easier to recall. Participants who reported dreams that related to the previous evening’s recorded events showed even stronger first-person recall and temporal closeness.
Follow-up testing one year later revealed evolving connections between events and their locations: immediately after sleep some spatial links may weaken as memories reorganize, but over the long term location often remains an important anchor for autobiographical memory. The team plans to combine HippoCamera with at-home targeted memory reactivation—replaying event-associated cues during specific sleep stages—to investigate whether sleep-based cueing can boost real-world memory retention.
Memory vividness and novelty
Lila Davachi’s team at Columbia University used a smartphone daily-diary approach to study how experiential variety affects long-term memory. Motivated by the pandemic’s impact on routine and context, they asked participants to log daily events over two weeks and then assessed autobiographical recall after a delay.
Participants categorized events as “novel,” “routine,” or “periodic.” Using AI-assisted analysis to manage many subjective reports, the researchers found that novel events were recalled with greater vividness and detail than routine or periodic events. Notably, routine and periodic events occurring on the same day as a novel event were better remembered than those on less novel days, suggesting a penumbra-like effect in which novelty enhances memory for surrounding experiences. This points to “experiential diversity” as an actionable factor people can use to create more memorable days.
Memory, emotion, and alcohol
Quantifying accuracy is a perennial challenge in memory research—especially for events that occurred outside the lab. Goldfarb emphasizes that smartphone methods allow researchers to be “present” when events occur, improving ecological validity. Her team uses mobile tracking to study how emotions shape memory, including in contexts relevant to substance use.
Memory influences addiction-related behavior: if someone lacks memory of drinking in a place, they may be less likely to relapse there. Smartphone-collected reports reveal how positive and negative aspects of drinking episodes are organized in memory and show that participants tend to bind elements of positive events more tightly. These real-world emotional effects are often stronger than what can be induced in lab settings, offering richer data for understanding how emotion guides memory-driven behavior.
Taken together, the smartphone studies presented at the Cognitive Neuroscience Society meeting highlight how sleep, replay, novelty, and emotion interact to shape autobiographical memory. By capturing naturalistic experiences on mobile devices, researchers are uncovering mechanisms that could inform interventions to strengthen everyday memory.
About this sleep, emotion, and memory research news
Author: Lisa M.P. Munoz
Source: Cognitive Neuroscience Society
Contact: Lisa M.P. Munoz – Cognitive Neuroscience Society
Image: The image is credited to Neuroscience News
Original Research: Findings were presented at the 32nd Meeting of the Cognitive Neuroscience Society