Neuroscience
The similar way we react to a joke and to being tickled has led some, including Darwin, to suggest that our emotional experience of each is the same: that tickle is a 'physical joke'. Now for the first time, psychologists have studied people’s emotional reaction to tickling and compared it with their reaction to joke-induced humour and to pain.
Eighty-four participants’ faces were filmed while their sides were tickled from behind by a researcher. They were also filmed reacting to jokes by stand-up comedians, and while they placed their hand in icy water. Afterwards they answered questions about how they had felt in the different conditions.
Christine Harris and Nancy Alvarado found that when tickled, people showed some authentic ‘Duchenne’ smiles, in which the skin creases around the eyes, thus suggesting they really were enjoying being tickled. But this smiling wasn’t
“The dissociation between smiling and self-reported pleasure during tickle provides some support for the hypothesis that, in tickle, Duchenne smiles can arise as automatic responses to a physical stimulus that need not be mediated by positive affect [emotion/feeling]”, the researchers said.
This suggests that “…ticklish smiling need have no closer a connection to mirth and merriment than crying when cutting onions has to sorrow and sadness”, they concluded.
The authors also discussed possible evolutionary explanations for why we laugh and smile when we’re tickled, including that it might promote play in young primates: “…tickle may elicit discomfort in the one being tickled in order to motivate the developing primate to avoid the tickling and may, at the same time, elicit smiling to encourage the tickler to continue (thereby promoting rough-and-tumble play)”.
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Harris, C.R. & Alvarado, N. (2005). Facial expressions, smile types, and self-report during humour, tickle, and pain. Cognition and Emotion, 19, 655-669.
Post written by Christian Jarrett (@psych_writer) for the BPS Research Digest.
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Neuroscience
Tickle: not such a laughing matter
The similar way we react to a joke and to being tickled has led some, including Darwin, to suggest that our emotional experience of each is the same: that tickle is a 'physical joke'. Now for the first time, psychologists have studied people’s emotional reaction to tickling and compared it with their reaction to joke-induced humour and to pain.
Eighty-four participants’ faces were filmed while their sides were tickled from behind by a researcher. They were also filmed reacting to jokes by stand-up comedians, and while they placed their hand in icy water. Afterwards they answered questions about how they had felt in the different conditions.
Christine Harris and Nancy Alvarado found that when tickled, people showed some authentic ‘Duchenne’ smiles, in which the skin creases around the eyes, thus suggesting they really were enjoying being tickled. But this smiling wasn’t
"Ticklish smiling need have no closer a connection to mirth and merriment than crying when cutting onions has to sorrow and sadness..."
correlated with self-reported enjoyment – people who said they’d enjoyed the tickling didn’t show any more of these genuine smiles than people who said they didn’t enjoy it, and vice versa. Moreover, while they were tickled, participants also exhibited facial expressions associated with pain, including wrinkling their nose and raising their upper lip. Also, in the tickling condition far more than in the comedy-clip condition, participants showed a mixture of pain-associated facial movements and smiling – what the researchers dubbed a ‘masking smile’ intended to conceal negative emotion.“The dissociation between smiling and self-reported pleasure during tickle provides some support for the hypothesis that, in tickle, Duchenne smiles can arise as automatic responses to a physical stimulus that need not be mediated by positive affect [emotion/feeling]”, the researchers said.
This suggests that “…ticklish smiling need have no closer a connection to mirth and merriment than crying when cutting onions has to sorrow and sadness”, they concluded.
The authors also discussed possible evolutionary explanations for why we laugh and smile when we’re tickled, including that it might promote play in young primates: “…tickle may elicit discomfort in the one being tickled in order to motivate the developing primate to avoid the tickling and may, at the same time, elicit smiling to encourage the tickler to continue (thereby promoting rough-and-tumble play)”.
_________________________________
Harris, C.R. & Alvarado, N. (2005). Facial expressions, smile types, and self-report during humour, tickle, and pain. Cognition and Emotion, 19, 655-669.
Post written by Christian Jarrett (@psych_writer) for the BPS Research Digest.
- People With Schizophrenia-like Traits Can Tickle Themselves (whereas Most People Can't)
Go ahead, try tickling yourself on your inner forearm or neck. If you're like most people, you'll find it doesn't work. The sensation would make you shiver or giggle with ticklishness if someone else did it, but when you do it yourself, it...
- Most People Can Fake A Genuine "duchenne" Smile
For years, the literature on the psychology of smiling has claimed that fake smiles can be easily and reliably distinguished from genuine smiles by the absence of crinkling around the eyes. The eye crinkling of a supposedly real "Duchenne smile" (named...
- The First Ever Experimental Investigation Of Laughing At Oneself
To be capable of laughing at oneself is usually considered a mark of good character and the foundation of a robust sense of humour. Yet this is a behaviour that's barely been touched on by psychologists. Opinions have been expressed - for example,...
- The Evolutionary Roots Of Laughter
To evolutionary psychologists, the noise made by gorillas, chimps and bonobos when you tickle their feet is no laughing matter. These distinctive vocalisations suggest that rather than evolving separately, laughter evolved in a shared common ancestor...
- Why, When We're Distressed, Do We Sometimes Smile?
You might have found yourself doing it: smiling when really you're upset or distressed. Why do we do it? It's a question that has divided psychologists. Is it to camouflage our true feelings from others? Or is it because smiling comforts us and...