Aside from tinnitus, which our neural network can experience as a local high frequency sound wave (harmonics?) I have experienced that myself, but when I write a considered argument or rebuttal, I *hear* an extremely high pitched sound wave throughout the entirety of my brain. It can't be blood rushing through veins, but must be related to the electro-chemical functions of the neural network. Question. If we can actually see *stars* (blips of energy produced by the brain when traumatized), why should we be unable to experience the act of *thinking*, IOW a highly complex brain activity, with certain associated wavelengths (harmonics), which we may experience as an extremely high pitched *hum* throughout the entirety of the brain? And for that matter, what are head aches?