Noise and music are more distracting to introverts at work

Many workplaces allow the playing of radio or recorded music during working hours, providing a chance to personalise and brighten the working climate. But how does music affect our ability to perform tasks at work? And does this depend on the kind of person we are? A recent study by a team from University College London sheds more light on this topic.

Stacey Dobbs, Adrian Furnham and Alastair McClelland worked with 118 female schoolchildren (aged 11-18) to investigate how tasks that demand focus are influenced by different kinds of auditory distraction administered over headphones. They developed two soundtracks, one composed of samples of environmental sound like children playing and laughter, and the other a mix of UK garage music. (I'll spare you the embarrassment of reading me trying to describe that.) They also wanted to know whether extraversion had any influence, following previous findings that suggest more introverted people suffer more from auditory distraction, as they are more easily overwhelmed by strong stimuli.

The participants attempted different tasks under the various conditions, and slightly different effects emerged. On a test of abstract reasoning, the participants did best under conditions of silence, and scores suffered less due to music than experiencing noise, when performance was lowest. But the penalties from auditory distraction diminished as extraversion increased, and the most extraverted students performed just as strongly in all conditions. On a test of general cognitive ability, and another of verbal reasoning, the silence and music conditions were comparable, with noise again leading to worst performance. Again, higher extraversion eliminated the penalty from noise.

We should always be careful generalising from a narrow sample (children) to another, although the extraversion effect has been observed before in adult groups (and it's also true that children do form part of our workforce). That said, it's interesting that noise was more disruptive than music across all tasks. The authors suggest that may be partly due to it lacking the positive emotional influence that music can provide; noise isn't designed to delight. They also draw attention to earlier work by the first author, which suggests that the most distracting music is that very familiar to the user. This suggests that an eclectic radio station, or a large and varied play-list, may be a viable alternative to wrestling with background chatter, or slapping that well-worn U2 record on. Again.

Dobbs, S., Furnham, A., & McClelland, A. (2011). The effect of background music and noise on the cognitive test performance of introverts and extraverts Applied Cognitive Psychology, 25 (2), 307-313 DOI: 10.1002/acp.1692

Social networks of extraverts are bigger but no more intimate

Do extraverts have more numerous and deeper social relationships? Organisations are increasingly interested in social capital, the networks accessed through individuals, so this is no idle question. Thomas Pollet from the University of Groningen, investigated this with University of Oxford collaborators Sam Roberts and Robin Dunbar, and their answer is yes, and no.



Recognising that our relationships aren't monolithic, the researchers treated social networks as a set of three layers. The inner support group contains those people (typically around five) that you would turn to in a crisis. Around this are a further ten-odd people, a sympathy group who would be deeply affected by your death. Finally there is an outer layer of more variable size, containing people connected to you by weak ties.



Pollet recruited 117 Dutch adults, who were asked to list their family, friends and acquaintances, and for each one, state the recency of communication and how emotionally close they were. Each network was grouped into layers, the innermost comprising those with past-week contact and over seven out of ten on the emotion measure; the sympathy layer those with past-month contact; and the outer layer receiving the rest. Each participant also completed a measure of extraversion.



The researchers found extraverts had more people in every layer – more weak ties, but also more individuals they contacted frequently. Although larger social networks have been reported before, this study finds the effect after controlling for age, a potential confound in other studies. However, extraversion didn't affect emotional closeness to their network: weak ties with occasional contacts don't appear stronger in extraverts.



The authors scrutinised every layer of the network, finding this same lack of effect throughout, but I'm cautious about interpretation at the inner layers, given that the emotional closeness score is both the variable of interest and the criteria used to determine membership. On my understanding, if introverts had a support group of contacts that they met frequently but gave low emotional closeness scores - fives or sixes - the methodology would never identify this.



It's worth noting the data suggests that regardless of extraversion, it's somewhat harder to keep close to all the members of a very large outer layer, which suggests a practical constraint that extraverts may be more liable to hit up against.



This study suggests extraverts have larger networks that are not simply populated by weak ties, but contain larger sets of close relationships. An organisation trying to tap into its social capital might start by talking to its most extraverted members. However, they shouldn't forget that introverts have equally deep relationships, nor that valuable networks contain the right people, not the most.



Pollet, T., Roberts, S., & Dunbar, R. (2011). Extraverts Have Larger Social Network Layers Journal of Individual Differences, 32 (3), 161-169 DOI: 10.1027/1614-0001/a000048