To analyze the questionnaire data, the average of the scores for the four statements related to ownership was computed to obtain a single “ownership statement” score. Similarly, the “agency statement” score was defined as the mean score of the four statements related to the sense of agency. The four control statements for ownership and agency were also averaged to obtain “ownership control statement” and “agency control statement” scores, respectively. Thus, references in the text to “ownership statements” or “agency statements” always refer to the average scores of the four individual statements in the original questionnaires unless explicitly stated otherwise. The ownership and agency statement scores were compared with their corresponding control statements. An average rating ≥ +1 indicates that on the group level, the participants affirmed the statement, i.e., they had experienced ownership or agency (this criterion has been used before; see Ehrsson et al., 2004 (link); Petkova and Ehrsson, 2009 (link)).
Measuring Ownership and Agency in Rubber Hand Illusion
To analyze the questionnaire data, the average of the scores for the four statements related to ownership was computed to obtain a single “ownership statement” score. Similarly, the “agency statement” score was defined as the mean score of the four statements related to the sense of agency. The four control statements for ownership and agency were also averaged to obtain “ownership control statement” and “agency control statement” scores, respectively. Thus, references in the text to “ownership statements” or “agency statements” always refer to the average scores of the four individual statements in the original questionnaires unless explicitly stated otherwise. The ownership and agency statement scores were compared with their corresponding control statements. An average rating ≥ +1 indicates that on the group level, the participants affirmed the statement, i.e., they had experienced ownership or agency (this criterion has been used before; see Ehrsson et al., 2004 (link); Petkova and Ehrsson, 2009 (link)).
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Corresponding Organization : BG University Hospital Bergmannsheil Bochum
Protocol cited in 19 other protocols
Variable analysis
- Stimulation condition (e.g., rubber hand illusion, control conditions)
- Subjective experience of ownership (measured by ownership statements)
- Subjective experience of agency (measured by agency statements)
- Exposure time (3 minutes) for each condition
- Likert scale for reporting subjective experience (-3 to +3, with 0 as uncertain)
- Control statements for ownership and agency (to account for task compliancy, suggestibility, and expectancy effects)
- Not explicitly mentioned
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