I read something recently (maybe on SCOTUSBlog?) about how oral arguments might not have much of an effect on the decision of the court, and that by the time th

I read something recently (maybe on SCOTUSBlog?) about how oral arguments might not have much of an effect on the decision of the court, and that by the time the arguments are heard, the justices have already researched and studied the issue, read the briefs, etc. and likely have already made up their minds. However I don't recall the study methodology or the source, take this with a grain of salt.