Well, that at least is an experiment one could set up. Time of reaction should probably be a reasonably-appropriate measure for “harder” (perhaps error rate, too, but on many tasks error rate is trivially low). But this requires to determine how “using a function” is detected; you’d need, at the very least, “clear cases” for each function.
Well, that at least is an experiment one could set up. Time of reaction should probably be a reasonably-appropriate measure for “harder” (perhaps error rate, too, but on many tasks error rate is trivially low). But this requires to determine how “using a function” is detected; you’d need, at the very least, “clear cases” for each function.