Autonomous Sensory Meridian Response: Phenomenon That Promote Happiness

Autonomous Sensory Meridian Response (ASMR) describes a tingly physical response triggered by specific visual and auditory stimuli such as whispering, personal attention, crisp sounds and slow movements. Some investigations find that ASMR is associated with specific personality traits such as openness. There also exist individual differences in functional neural connectivity across individuals who do and do not experience ASMR. The similarity and high correlation between ASMR and frisson and misophonia allow us to guess the possible formation mechanism of ASMR from the perspective of those two. The high correlation with mindfulness reveals the potential for assisting psychotherapy.

Psychology (Roberts et al., 2020). Similarly, despite ASMR and synesthesia consistently targeting specific stimuli, individuals can choose to leave the stimulus to stop ASMR while synesthesia experience is uncontrollable (Barratt & Davis, 2015).
ASMR and misophonia are both responses to special patterns of sounds, but the emotions they bring are opposite: ASMR is often accompanied by positive emotions, while misophonia is negative (Rouw & Erfanian, 2018).

Triggers and Sensations of ASMR
In one of the earliest research, Barratt and Davis (2015) categorized common triggers for ASMR, and where these sensations were often experienced on the body. A total of 475 participants accomplished an online questionnaire contained 7 sections which gathering information of demographics, ASMR video viewing habits, whether theses triggers are commonly present in ASMR video produce tingles, the location of tingling sensation associated with ASMR, "Why do you watch ASMR video?", flow state scale, effect on mood and chronic pain.
The results showed that there are four common categories of triggers: whispering, personal attention, crisp sounds and slow movements (Barratt & Davis, 2015). Other common preferences were soft-spoken voice particularly presented as speech sounds like "s", "sh", "sk" as well as breathing, chewing, and eating sounds. As for non-vocal triggers, individuals prefer brushing, buzzing, tapping sounds, clicking or scratching, water noises and the sound of hair being combed or brushed. About sensations, individuals widely reported that typical sensations associated with ASMR was a tingling sensation which originated at the crown of head, to the back of scalp and progressed down the line of spine.
After that, they investigated the key multisensory factors contributing to the successful induction of ASMR through online media (Barratt et al., 2017). Aspects such as timing and trigger load, atmosphere, and characteristics of ASMR content, ideal spatial distance from various types of stimuli, visual characteristics, context and use of ASMR triggers, and audio preferences are explored.
Lower-pitched, complex sounds were found to be especially effective triggers, as were slow-paced, detail-focused videos. Conversely, background music inhibited the sensation for many respondents. However, it is worth noting that these features, which are relatively more people selected, do not have a significant advantage. Different subjects have very different self-reports of sensitive triggers, physical responses and psychological outcomes.

Individual Difference in ASMR
These differences suggest the existence of individual differences in ASMR susceptibility and consequences. Fredborg, Clark and Smith (2018)  was significantly lower than that in the control group. The DMN of ASMR individuals also showed increased connectivity between the occipital, frontal and temporal cortical regions, indicating that ASMR is associated with a mixture of multiple resting state networks. In this study, the method used to screen the participants was to ask them to confirm the trigger list. The answer was not an instant confirmation and was easily misled by the participants' memory. In later research, they improved this method of screening participants: let the participants watch ASMR videos on-site, and confirm whether they belong to the ASMR group or the control group based on the real-time response. And this research has reached similar conclusions as before (Smith et al., 2019).
In addition to the comparison of neural network activities between ASMR experiencers and non-sensed individuals, researchers have further explored the differences in the brain activity of ASMR experiencers who are sensitive to different triggers (Smith et al., 2020). They recruited 15 people who had ASMR experience, asked them to confirm the trigger list, selected the 5 most sensitive types, and performed a 7-minute resting fMRI scan on them. Grouped by different trigger types, it turns out that the functional connectivity pattern of each group was unique, and the sensitivity to two trigger categories was positively correlated with the dorsal attention network, suggesting that ASMR may involve atypical attention processing.

Relationship between ASMR and Other Similar Psychological Phenomena
Whether it is the different personality traits, neural network activities, or other individual differences between ASMR experiencers and non-sense individuals, it reveals that ASMR may be some kind of basic difference related to cognition, feeling, and attention. In terms of the application of ASMR, some researchers pay more attention to the relationship between ASMR and some similar psy-Psychology chological phenomena in order to understand its causes and application methods.
del Campo and Kehle (2016)  found that the two groups only differed in absorption. In the other two cases, the difference was not significant, indicating that the ASMR status may be associated with the ability to go deeply immersed with the current experience.
The similarity and high correlation between ASMR and frisson and misopho-Y. Peng, X. Xiao Psychology nia allow us to guess the possible formation mechanism of ASMR from the perspective of those two. The high correlation with mindfulness reveals the potential for assisting psychotherapy. In future study, the ethical research and legalization of ASMR video can be a problem, because many ASMR videos contain sexual cues such as kiss sounds. People's perception of ASMR video is also polarized: people who can experience it find it useful, and others who have no similar experience feel bored what moderators affect the ASMR effect are waiting for investigating. Experimental studies of these two types of people may also reveal some of the mechanisms of ASMR.

Conclusion
There is still room for exploration in the application of ASMR in psychotherapy, especially in the fields of mindfulness, flow, and meditation. In daily life, ASMR already has a wide range of fans. Many video viewers aim at opportunities for relaxation and promotion of sleep, some others also report purposes of dealing with depression, anxiety and chronic pain (Barratt & Davis, 2015;Rouw & Erfanian, 2017). With the development of the Internet and technological innovation of video production, ASMR videos are much easier to achieve on contrast to the hardness of getting professional psychotherapy, thus a lot more people under pressure can benefit from it. Simply use a networked device with a pair of earphones and you can enjoy a rare personal relaxation at anywhere you like in 10 minutes. In addition, as the covid-19 spreads globally, many people are trapped at home, and negative emotions such as anxiety and depression increase. ASMR, as a potential intervention method mainly circulating on the Internet, maybe more feasible and can play a greater role than conventional psychological treatment programs.