As expected, in the rubber left hand condition people did not experience ownership of the hand, but somewhat surprisingly they reported a rather high degree of touch duplication.
Thus, the only important difference between Petkova's illusion setup and our "rubber left hand" condition is the distance between the stimulated hands (42 cm and 12.5 cm).
Unexpectedly, this was not significant for the comparison between the illusion condition and the rubber left hand control condition (S5 S6) (F(1, 24) = 3.110, p = 0.091, simple contrast).
A rule consists of two parts: LHS (left hand side) is the conditions of a rule and RHS (right hand side) is the reasoning results.
Importantly, the participants agreed significantly more strongly on the questionnaire statements relating to rubber hand ownership (S1 S2) during the rubber right hand condition (i.e., the illusion condition) in comparison to the rubber left hand and the rubber right foot conditions, respectively (S1 S2) (F(1, 24) = 8.594, p = 0.007 and F 1, 24) = 106.457, p<0.001, simple contrasts).
Thus we compared synchronous stimulation of the real right hand and a rubber right hand (illusion condition), a rubber left hand or a rubber right foot (control conditions).
Fig. 5 Screen shot of the interface that the subjects see during experiment Fig. 6 First group condition, possible to see left hand Fig. 7 Second group condition, cannot see left hand.
The fingers were stimulated in 60 second blocks alternating between right hand, left hand, and no stimulus (rest) conditions in randomized order, with a 20 second delay between each block.
This was done by transposing left and right hemisphere data in the left hand condition to permit averaging with the right hand condition.
Second, we arranged three elements of the diamond model – processes, people, and appeals – around the central concept of rationales (see Table 2, left hand column), because we discovered that conditions of accountability for reasonableness – relevance, publicity, and appeals (Table 2, middle column) – bound these elements to rationales.
In experiment 3 we compared the supernumerary illusion with a rubber right hand to a control condition with a rubber left hand.
