VR Reveals How Stress Selects Which Memories the Brain Keeps
The brain perceives, analyses, sorts and stores memories. Not all experiences are retained equally. This is especially true under pressure or emotional stress.
Researchers at the Universitat Oberta de Catalunya (UOC) have found that negative emotions strengthen the central details of experiences. They weaken recollection of the surrounding context. The study was published in the journal Virtual Reality.
Álvaro Pastor, a recent PhD graduate from the UOC’s Network and Information Technologies doctoral programme, was one of the authors. He worked alongside Pierre Bourdin-Kreitz, a researcher at the Faculty of Computer Science, Multimedia and Telecommunications. Bourdin-Kreitz also coordinates the UOC’s virtual reality laboratory, XR-Lab. Both are members of the Learning, Media and Entertainment research group (GAME). This group is attached to the UOC’s Interdisciplinary Research Centre on Social and Cultural Transformations (UOC-TRÀNSIC).
The researchers created a virtual airport simulation. Participants took on roles as employees at two boarding gates. They were asked to find and identify specific passengers in the crowd. They checked both names and faces. Some participants performed this task under high stress for a prolonged period. Others worked in an emotionally neutral state.
The results were clear. Participants in an intensely negative emotional state remembered passenger names and faces more accurately. They retained these details for longer. The exact location where each passenger had been found was not vital to the mission. This detail was not stored in their memory.
Brain activity is one of the most high-energy processes in the human body. When the brain experiences a strong emotion, it cannot remember everything equally. It dynamically prioritises memory. Resources are channelled toward creating specific, goal-relevant memories.
The brain does not enhance or suppress memory as a whole. It fine-tunes the associative processes that form our memories. Some associative processes connect separate elements, such as a face and a place. Others merge different elements into a single unit, sometimes binding components that would otherwise remain separate, such as a face and a name. Under intense stress, the brain favours this second type of associative process.
The researchers emphasised that the importance of the event determines this outcome. An object’s capability to evoke emotion is not the deciding factor. They stressed that prioritising certain memories in negative emotional situations is not a cost. It is a useful adaptation. Failing to remember certain contextual details during highly stressful situations is entirely normal. This does not mean the memory is false or unreliable. It reflects how the brain operates under pressure.
Virtual reality and immersive technology can elicit emotions in a sustained and multimodal manner. This ability extends far beyond basic memory research. The findings carry a clear message. Forgetting certain details after a traumatic or stressful experience does not mean those memories are faulty or fabricated.
The understanding of episodic memory gained through this study could prove useful across several fields. In education, the findings can inform the design of learning environments that encourage positive emotional engagement rather than high anxiety. Judicial contexts could benefit from greater awareness of why victims may be unable to recall certain events. In healthcare, the technology could enable traumatic events or situations that trigger phobias or social anxiety to be recreated under controlled conditions that real life cannot offer. The approach could also examine how different emotional conditions influence decision-making, attention and motor performance.
The researchers noted that the approach may help improve systems in which mistakes under pressure carry serious consequences. Aviation, healthcare and critical infrastructure management are three such fields. They concluded that traditional methods have yielded valuable knowledge. This new approach, however, reveals the interaction between emotions and memory in conditions closer to real life. That makes the results easier to apply to realistic needs.
