Mirror-touch synaesthesia is a condition where observing touch to another’s body induces a subjective tactile sensation on the synaesthetes body. The present study explores which characteristics of the inducing stimulus modulate the synaesthetic touch experience. Fourteen mirror-touch synaesthetes watched videos depicting a touch event while indicating whether the video induced a tactile sensation, on which side of their body they felt this sensation and the intensity of the experienced sensation. Results indicate that the synaesthetes experience stronger tactile sensations when observing (...) touch to real bodies, whereas observing touch to dummy bodies, pictures of bodies and disconnected dummy body parts elicited weaker sensations. These results suggest that mirror-touch synaesthesia is not entirely bottom-up driven, but top-down information, such as knowledge about real and dummy body parts, also modulate the intensity of the experience. (shrink)

This paper examines the type of theory used to justify the application of physical scale modelling to the solution of mid-nineteenth century engineering problems. To do this, it discusses three particular examples: the initial Britannia Bridge breaking experiments of E. Hodgkinson, the vibrating railway bridge experiments of R. Willis and G. G. Stokes; and the ship resistance experiments of W. Froude. The theory invoked in these case histories is viewed against the background of the response of the contemporary engineering community (...) and compared with the notion of engineering science as proposed by W. J. M. Rankine. (shrink)