Interesting finding. Although no reason is given behind this, an active integration (such as addition) of the SR and the actual sensory cue in a spatial scale is probably responsible.
Regarding 'the examiner was blinded', I wouldn't like to be an examiner, I don't want to lose my eyes! :)
The effects of vibro-medical insole on sensation and plantar pressure distribution in diabetic patients with mild-to-moderate peripheral neuropathy.
Bagherzadeh Cham et al Clin Biomech (Bristol, Avon). 2018 Aug 18;59:34-39. doi: