Exact(3)
There are typically three types of evidence used to indicate the illusion.
There are normally a number of questions that indicate the illusion and others that are thought of as control questions that are apparently similar but do not indicate the illusion.
We expected Q5 and Q6 to indicate the illusion, Q9 and Q10 were to examine whether the illusion vanished after completion of the experiment, and Q11 was an overall summary indicator of the strength of the illusion, and quite a demanding question since it refers to having a 'very strong' illusion.
Similar(57)
As expected the three questions Q1 Q3 indicating the illusion are each significant (just outside the conventional limit for Q2).
The most interesting evidence in favor of the illusion is that there are positive correlations between the questionnaire scores indicating the illusion and ΔSize.
Based on previous work we therefore expected Q1 Q3 to have greater scores indicating the illusion in the synchronous condition compared to the asynchronous, but no significant difference for questions Q4 and Q8.
As Table 1 indicated, the illusion was generative (positive judgments) in the former case and preventive (negative judgments) in the latter.
These results indicate that the illusion was relatively robust as compared to the asynchronous tapping condition.
Q9 Q10 indicate that the illusion ended after the experimental trial with no difference between synchronous and asynchronous conditions.
Representative individual results shown in Figure 1 indicate that the illusion (black line) waxed and waned during the 6-minute vibration period, with periods of no movement occurring more often with prolonged stimulation.
Because our behavioral experiment indicated that the illusion starts a few seconds after the vibration onset, we modeled the first 4 s of all experimental conditions as an effect of no interest.
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