I cannot think  of any other method than video recording. The following reference may be of interest-

Best wishes to all for the New Year

Ron Eccles

Corley, D. L., R. Gevirtz, et al. (1987). "Prevention of postinfectious asthma in children by reducing 
self-inoculatory behaviour." Journal of Pediatric Psychology 12: 519-531.
	
Studies investigating the the spread of colds via hand transmission have involved some very elaborate 
and fascinating experimental designs. In one study sixteen children aged between 4 and 8 years were 
trained to alter their behaviour and not to touch their nose and eyes so frequently to see if this 
behavioural change could help reduce the number of infections and the incidence of asthma attacks 
associated with common cold. The training involved children watching a presentation in which a clown 
went around touching door handles and other surfaces contaminated with a brightly coloured dye and 
then watching how the clown ended up with a brightly coloured nose and face. The children were 
rewarded with tokens they could trade in for prizes if they could avoid hand contact with their nose 
and eyes and the progress of the training was monitored by videotaping sessions with the children and 
counting the number of hand contacts with nose and eye. The training successfully reduced the 'self 
inoculatory' behaviour from around 36 contacts per 2 hours in a control group to around 6 contacts 
per hour in the trained group of children. The reduction in self inoculatory behaviour was associated 
with  a 45% reduction in common cold associated asthma attacks and a 47% reduction in laboratory 
diagnosed common cold infections.



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