"Nostalgia 'warms the hands as well as the heart'," reports The Daily Telegraph.
Its headline is prompted by research that explores whether nostalgia, often defined as emotional "warmth" about past events, is triggered by colder temperatures, and if it can stimulate physical feelings of warmth.
The research consisted of a series of experiments that found:
The researchers speculate that nostalgia may act as a kind of emotional central heating – when we feel ourselves becoming cold we become more nostalgic, which in turn makes us less sensitive to the cold.
Nostalgia could act either by causing the body to perform processes to correct its temperature, or by tricking the body into thinking it is in a warmer situation. Further experiments are required to determine whether these ideas are correct.
It is worth bearing in mind that any effect of nostalgia on your body's temperature regulation system (homeostasis) isn't enough to keep you warm in severe cold weather.
The study was carried out by researchers from Sun Yat-sen University, China; Tilburg University, the Netherlands; and the University of Southampton.
It was funded by a number of different Chinese research foundations and grant schemes and was published in the peer-reviewed journal, Emotion.
This study was covered accurately by both The Daily Telegraph and the Daily Mail, but the Mail's use of the words "listening to the Beatles… can make you feel hotter" may not be representative of the study.
The study reported that participants in the experiment listened to pop music with "themes of love and personal loss". So, while the music used could have included the Beatles, it could also have included Dutch power ballads from the early 90s.
The researchers report that there is growing evidence that nostalgia counteracts adverse psychological states.
In this paper, they aimed to explore whether nostalgia could also have a role in maintaining physiological comfort, such as an increased tolerance to cold temperatures.
This paper presents a series of five experiments of differing design. Some of the experiments were randomised controlled trials (RCTs), some were non-randomised controlled trials, and others were cross-sectional studies.
The researchers tried to design the series of experiments so that alternative explanations for findings and weaknesses in the designs of the studies were ruled out or compensated for by other studies.
The research consisted of a series of five experiments:
In the first experiment, the researchers recruited 19 students in China.
They asked them to rate their feelings of nostalgia on a scale of zero to 10 each day for 30 consecutive days, and to report it at the end of each day using their mobile phone. The researchers looked to see if there was an association between the average daily temperature (the average of the maximum and minimum daily temperature reported by a local weather station) and feelings of nostalgia.
In the second experiment, the researchers randomly assigned 90 Chinese students to rooms maintained at three temperatures: 20°C, 24°C and 28°C. The students were asked to complete a five minute "filler task" (a meaningless task designed to clear students' minds) and then a checklist known as a "nostalgia inventory". The nostalgia inventory is based on a series of questions about how nostalgic participants feel about items from their past (such as pets, places, music and films they grew up with).
A comfortable ambient temperature is 24°C, and the researchers hypothesised that feelings of nostalgia would be greater in participants assigned to the room below this temperature.
In the third experiment, 1,070 Dutch volunteers listened to four pop songs of diverse genres with lyrics covering themes of love and loss. After each song, participants were asked how nostalgic a song made them feel on a scale of one to five and whether the song produced a physical sensation of warmth. The researchers then examined the association between music-evoked nostalgia and physical warmth.
In the fourth experiment, 64 Chinese students were seated in a room maintained at 16°C. The participants were asked to either recall:
The participants were then asked to rate how nostalgic they were feeling and to estimate the temperature of the room in degrees celsius.
In the fifth experiment, 80 Chinese students were again asked to either recall a nostalgic event or an ordinary autobiographical event.
Feelings of nostalgia and positive and negative emotions were then assessed. Participants were asked to place their hand in a water bath maintained at 4°C and remove it when the sensation became too uncomfortable.
The amount of time the participant kept their hand in the cold water was timed.
The researchers examined whether thinking about a nostalgic event would increase tolerance to cold.
The researchers found that:
The researchers concluded that, "nostalgia – an emotion with a strong connotation of warmth – is triggered by coldness. Participants reported stronger nostalgia on colder (vs. warmer) days and in a cold (vs. neutral or warm) room... Higher levels of music-evoked nostalgia predicted increased physical warmth, and participants who recalled a nostalgic (vs. ordinary autobiographical) event perceived ambient temperature as higher. Finally, and consistent with the close central nervous system integration of temperature and pain sensations, participants who recalled a nostalgic (vs. ordinary autobiographical) event evinced greater tolerance to noxious [painful] cold."
In this series of experiments researchers found a consistent association between nostalgia and perceived perception of physical warmth.
They also found that colder environments are more likely to provoke feelings of nostalgia.
It has been suggested that nostalgia could maintain psychological comfort. These experiments suggest that nostalgia could also maintain physiological (physical) comfort. Nostalgia could act either by causing the body to perform processes to correct its temperature or by "tricking" the body into thinking it is in a warmer situation.
However, further experiments are required to determine which mechanism is operating to create this physical response.
While interesting, it is difficult to see what, if any, practicable applications could arise from this research.