Background: I'm running a project to look at which auditory features predict people's reactions to contour tones. I used both unidirectional tones (e.g., a rising tone starts at 100hz and ends at 300hz ) and bidirectional tones (e.g., a tone starts at 100hz, rises to 300hz, and then falls to 150hz).
The plan for data analysis is to build a linear model that includes the auditory features of stimuli and see to what extent those features explain participants' behavioral data.
My question: One feature I'm interested in is the slope of the fundamental frequency of each tone. It's easy to calculate that for unidirectional tones. However, is there any solution to calculate the slope for the bidirectional ones?
I once considered labeling them categorically, but doing this loses the distinction between each stimulus within one category, which is not favorable to the purpose of my project.
Many thanks for reading my question. I would highly appreciate it if anyone would like to offer any help!