Table 1.
Major differences among the three tactors.
Fig 1.
Experimental illustration for Part I: Bird’s eye view (triangle represents the participant’s nose) of the Part I tactor configurations; three tactors were placed on the torso (possible locations included the navel, spine, left and right side).
Fig 2.
Experimental illustration for Part II: Five C-2 tactors were placed at five body locations.
Fig 3.
Experimental illustration for Part III: Four C-2 tactors grouped in a 2x2 array formed four patterns; the solid dots indicate the tactors that were activated in the corresponding patterns.
Fig 4.
RTs to four different types of vibrotactile stimuli at torso locations; error bars present standard errors of means across participants; asterisk symbols (*) present statistical significance.
Fig 5.
RTs to vibrotactile stimuli at five different body locations for both YA and OA with and without ACV; error bars present standard errors of the means across participants.
Asterisk symbols (*) indicate a subset of the comparisons that were statistically significant; although significant, the following statistically significant comparisons are not indicated with asterisks on the figure: 1) RTs at the head location were significantly faster than all other locations for both YA and OA, except for the comparison between RTs at head and finger locations for OA, and 2) RTs at the foot location were significantly slower than all other locations for OA.
Fig 6.
RTs to the four stimulation patterns for both YA and OA; error bars present standard errors of means across participants; asterisk symbols (*) present statistical significance.
Fig 7.
RTs to the vibrotactile stimuli at five different body locations with or without the secondary task; error bars present standard errors of means across participants; asterisk symbols (*) present statistical significance.
Fig 8.
RTs for the common tactor located at the navel for three experimental parts; Part I: Three tactors at four locations around the torso; Part II: Five tactors at five locations across the body; Part III: Four tactors in a cluster at the navel.
Error bars present standard errors of means across participants; asterisk symbols (*) present statistical significance.
Table 2.
Summary of various factors’ effects on RTs for YA and OA (only significant effects shown).