Aren't your own thoughts similar to a CPU's registers or cache? One's thoughts seem to occur within the context of the brain and the billions of neighboring (to the ones inducing the current "thought") neurons. Its as obvious to me that you can't perceive another's thoughts just as surely as one CPU can't "perceive" the registers of another.

The perception of ones own thoughts seems very physical, as is the equally obvious (to me) explanation that you can't directly perceive the thoughts of another.