I don’t know neuroscience. I do know that sometimes there is so little known about a given area that one has to grasp at straws so to speak. You look for clues and present the findings. I don’t know what one does with the data represented. It appears to me that the data doesn’t represent a function. There’s a lot of “verticality” in the data. It’s obviously not exponential, logarithmic, or parabolic or some other higher degree polynomial. So how does one fit such data? I don’t know. Is it dumb to use linear fit? Or is it common practice with such data?