Recent research published in consciousness and cognition This provides evidence that everyday mental quirks such as déjà vu and tip-of-the-tongue states are natural byproducts of a resting mind. The results of this study suggest that when a person’s attention is not fully focused, a variety of spontaneous thoughts and reflective emotions naturally emerge into consciousness.
Scientists conducted this study to understand whether it is possible to systematically capture a wide range of sudden mental experiences in a laboratory setting. Previous research has focused primarily on involuntary memories, which are memories of personal events that come to mind without warning. The researchers wanted to know whether the same boring, repetitive conditions that produce these memories also produce other naturally occurring phenomena.
They specifically focused on metacognition. Metacognition is a term used to describe the brain’s ability to think about and monitor its own processes. We may use metacognition intentionally, such as trying to measure how well we have learned a topic for a test, but it can also be used effortlessly.
Spontaneous metacognition involves sudden feelings like déjà vu, the feeling that a new situation is very familiar. It also includes the sudden realization that familiar words seem strangely wrong, a phenomenon known as jamais vu.
“This study was motivated by the observation that many mental experiences, such as déjà vu, tip-of-the-tongue states, and sudden memories, appear spontaneously in everyday life, yet are usually studied separately in different fields of psychology,” explained study author Christian Barzykowski, director of the Institute of Applied Memory at the University of Jagiwonia and Marie Skłodowska-Curie Postdoctoral Fellow at the University of Grenoble. Alps University.
“We wanted to take a broader look at human cognition and move beyond examining just a small part of everyday mental life at a time. By using an experimental paradigm known for eliciting involuntary autobiographical memories, we also wanted to look at a broader range of voluntary experiences. The aim was to see if these common mental events appeared together and to see if they could help us understand how different aspects of spontaneous cognition are related.
The researchers recruited 96 college students for the study and had them complete a low-demand vigilance task. These types of tasks are intentionally boring and require little mental effort, creating an ideal environment for your mind to drift. Participants viewed a series of 400 slides on a computer screen for about an hour.
Each slide displayed a word overlaid with a background image or a pattern of horizontal or vertical lines. Participants worked on simple tasks that required sustained but shallow attention. They were instructed to press a specific key on the keyboard only if, infrequently, a vertical line appeared.
The background images included familiar photos of provincial cities in France, unfamiliar photos of foreign cities in Pakistan, real French words, and made-up words. Participants were instructed to ignore these background items and concentrate completely on the line pattern. However, they were also asked to press the spacebar whenever they experienced a spontaneous thought or mental state during the task.
Pressing the spacebar now pauses the experiment and allows you to categorize your experience. Options included unconscious memory, déjà vu, jammy view, zoning out, detecting the mistake you just made, and tip of the tongue condition. Tip of the tongue condition is the frustrating feeling of knowing certain information but not being able to remember it properly.
The researchers found that participants experienced a variety of these mental states. The most frequently reported experiences were casual memories of the past. These memories are most often triggered by familiar pictures or real words. The second most common experience was deja vu. This phenomenon tended to occur most often when participants saw both familiar and unfamiliar photos.
Scientists observed a positive association between the two most frequent experiences. Participants who had more involuntary memories tended to report more déjà vu.
This association provides evidence that these two phenomena share common mental mechanisms. Cues in the environment can trigger the brain’s memory retrieval system. Instead of evoking concrete memories, the process can stall and only a vague sense of familiarity remains.
Other mental conditions occurred less frequently but were still consistently present. For example, participants reported feeling jamaived most often when they saw made-up words. Zoning out occurred at a constant rate throughout the experiment, regardless of what was displayed on the screen.
Tip-of-the-tongue conditions and sudden error detection were the rarest events. This is likely because the ongoing task did not require complex problem solving or active memory retrieval.
“One of the interesting observations was how reliably this task elicited not only involuntary memories, but also several other spontaneous experiences,” Barzykowski told PsyPost. “Although we expected unconscious autobiographical memories to emerge, it is noteworthy that phenomena such as déjà vu and tip-of-the-tongue states also emerged in the context of the same experiment.”
The scientists also asked participants to rate their experience based on how spontaneous they felt, how strong the emotion was, and how much it distracted them from the main task. Across all types of mental states, ratings of spontaneity and intensity were surprisingly similar. This supports the idea that these sudden thoughts are rapid, uninvited events that temporarily pull a person’s attention away from the outside world and turn it inward.
The researchers also noted that there was a relationship between how well participants performed the line-matching task and the number of mental states they reported. Those who had higher accuracy in detecting rare vertical lines tended to report less spontaneous thinking overall. They also reported fewer instances of déjà vu, suggesting that being deeply focused on external tasks leaves less mental space for these internal feelings to arise.
“The important point here is that many unusual mental experiences, such as sudden memories of the past, feelings of déjà vu, and tongue-in-cheek moments, are not uncommon and are not mysterious mental malfunctions,” Barzikowski explained. “Rather, they appear to be a natural byproduct of the way our cognitive systems continually process information in the background.”
“Our findings suggest that a variety of spontaneous thoughts and emotions may emerge into consciousness when the mind is not fully focused on a demanding task. In other words, these experiences may reflect normal, adaptive aspects of how the mind monitors information and connects the current moment with stored knowledge and memories.”
As with all research, this study also has some limitations. Because the experiment relied on participants noticing and reporting their thoughts, some may have missed fleeting mental states. Providing definitions of these experiences in advance may have also shaped participants’ expectations of how they would feel during the task.
Additionally, some of the laboratory-induced experiences lacked the emotional intensity that people typically feel when these events occur naturally. For example, déjà vu felt in the laboratory is often rated as less intense than the startling, sometimes anxiety-provoking déjà vu felt in the real world. This suggests that the full richness of these mental states may not be captured in a sterile laboratory environment.
“One of the long-term goals of this research is to better understand spontaneous cognition, the thoughts, memories, and emotions that occur in the mind without deliberate effort,” Barzykowski said. “In the future, we hope to improve experimental methods that allow us to collect these experiences more broadly and examine how they relate to each other.
“We are also interested in understanding why people differ in how often they experience phenomena such as involuntary memory, déjà vu, and tip-of-the-tongue states. We are also interested in understanding whether these differences may influence everyday cognitive functioning. Ultimately, this line of research may help us better understand how the mind continuously monitors information and connects past experiences to the present moment.”
“I would also like to emphasize that this research is the result of a collaborative study supported by several funding initiatives. Gull Zareen was supported in part by the French National Research Agency. My own research was supported by the European Union’s Horizon research and innovation program through a Marie Skłodowska-Curie Postdoctoral Fellowship. The views expressed in the study are those of the authors and do not necessarily reflect the views of the European Union or the European Commission.”
The study, “Spontaneous Metacognitive Experiences and Involuntary Memory in the Laboratory,” was authored by Gull Zareen, Céline Souchay, Krystian Barzykowski, and Chris JA Moulin.
