Affective Touch Reduces Electrically Induced Itch Experience

Introduction: Itch is a common symptom in dermatologic and other diseases and can have a severe impact on quality of life and mental health. As a proportion of patients with itch-symptoms is resistant to commonly used anti-histamine treatments, development of new treatments is desirable. Past research on pain, itch and affective touch (i.e. slow, gentle stroking of the skin activating C-tactile fibers) revealed an inhibitory relationship between affective touch and pain and between pain and itch. Given the overlap in neural processing between these three sensory submodalities, a possible interaction between affective touch and itch might be expected. This study investigated whether there is a relationship between itch and affective touch, and if so, whether affective touch inhibits itch.Methodology: Itch was electrically induced with the use of electrodes that were placed at the ventral side of the wrist of 61 participants. A within-subject design was conducted with two conditions. An experimental -affective touch- condition (stroking the forearm with a soft brush at 3 cm/s) and a control -non-affective touch- condition (stroking the forearm with a soft brush at 18 cm/s). Touch was applied on the dorsal side of the forearm, the same arm as were the electrodes were placed. For each condition itch was induced for 20 min, with every 2 min a VAS-scale measurement of the level of experienced itch.Results: Both types of touch reduced the experienced itch compared to baseline (p < 0.01, partial η2 = 0.67). However, affective touch had an additional significant relieving effect compared to non-affective touch (p = 0.03, partial η2= 0.08). The alleviation of itch started after 2 min of stroking and continued to increase up till 6 min, where after the relieving effect stabilized but still persisted.Conclusion: This finding suggest that affective touch, as with acute pain, has a relieving effect on electrically induced itch.

The Role of Physical Activity and Touch in Children’s Social Bonding

Physical activity (PA) and touch, long known to facilitate interpersonal affiliation in adults and non-human primates, are common elements of children’s free play. However, no research has examined how children’s play involving PA and touch is linked with social bonding (i.e., positive emotional states and behaviors that help create, maintain and characterize affiliation and attachment among individuals). This paper reports on two novel studies designed to explore these links in children’s play. In two studies, we investigated associations between PA, touch and prosociality in 5-to-8-year-old children. In a naturalistic observation study (N = 50), we assessed the amount of PA, smiling/laughing, touch, and prosociality in children’s play behavior during school breaks. PA levels were also measured indirectly via heart rate monitors (HRM). The findings revealed that observed-PA was associated with the amount of smiling/laughing. PA (observed and HRM) was also associated with the amount of touch. In a second study (N = 84), we experimentally tested the effect of touch on helping behavior in the context of physically-active play. In pairs, children ran to collect felt shapes which they placed either onto each other (touch condition) or onto a board (no-touch condition). Subsequent helping behavior was assessed in a separate task. There was a non-significant trend towards more helping in the touch condition. We discuss the findings in terms of the significance of PA and touch for social bonding in childhood and offer suggestions for future research in this underexplored area.

Increasing Compliance with a Request: Two Touches are More Effective than One

Touch procedures have been shown to increase the likelihood of compliance with requests. But the effect of subsequent touches following a classical touch procedure has not been investigated. It was predicted that two touches would lead to more compliance than one touch. 180 male and 180 female bystanders were asked to fill in a short or long questionnaire by a female confederate. They were touched by the confederate either once, twice, or not at all. Results showed that there was more compliance in the two-touch than in the one-touch condition, and when the participants were touched by the confederate. These findings support the hypothesis. Moreover, whereas participants were less likely to fill in the long questionnaire in the no-touch condition, touch procedures led to more compliance whatever the questionnaire length. Also, touch was more effective when a female confederate made the request to a male participant.

Radical “Visual Capture” Observed in a Patient with Severe Visual Agnosia

We report the case of a 79-year-old female with visual agnosia due to brain infarction in the left posterior cerebral artery. She could recognize objects used in daily life rather well by touch (the number of objects correctly identified was 16 out of 20 presented objects), but she could not recognize them as well by vision (6 out of 20). In this case, it was expected that she would recognize them well when permitted to use touch and vision simultaneously. Our patient, however, performed poorly, producing 5 correct answers out of 20 in the Vision-and-Touch condition. It would be natural to think that visual capture functions when vision and touch provide contradictory information on concrete positions and shapes. However, in the present case, it functioned in spite of the visual deficit in recognizing objects. This should be called radical visual capture. By presenting detailed descriptions of her symptoms and neuropsychological and neuroradiological data, we clarify the characteristics of this type of capture.