is presence between subjects why do they use questionnaires to measure presence how to use the presence test what is the difference between between-subject and within-subject what measures presence of the subject in a virtual world which condition is a measure of the presence of a subject? which condition is used to describe a participant's sense of presence? what is presence? why is it useful to use self reporting questionnaires for presence how to measure the presence of a subject what is the difference between between experiments and within studies difference between between and between subject and within subject when to use presence test what is difference between a presence questionnaire and an individual questionnaire why is presence a subjective variable what is presence in statistics what is the definition of presence questionnaire which is better between subjects than within subjects? how to measure someone's presence online how to test validity of presence questionnaires?