I conducted a research with 90 participants who were exposed to a film stimuli for 60 minutes and their physiological responses were measured continuously. I would like to test the causal relationship between this psychological response and a another continously measured visual feature of the stimuli. Physiology was measured 15 times per second, the visual feature was measured 1 time per second.
I think that I need to use a cross-correlation and I found a function for it in SPSS (I am only able to work with SPSS and I have no background in mathematics). As I am complete beginner in time-series analysis, I would like to know:
- if cross-correlation is the correct statistic here or whether I should use some other type of model?
- if I need to consider anything during the data preparation (detrending is often mentioned in the literature, but I don't know how to do that in SPSS or if I need it at all)?
- if there is a book with a gentle introduction to this topic?