In head copying of Morse code, two operations are done at the same time. Deciphering from dits/dots to character while understanding what they are meaning. The former process, phono-lexical process, seemingly proceeds a bit earlier. In actual psychological process, the latter, lexico-semantic process, however, goes on almost at the same time. Or they are going on at the same time reinforcing each other. The former process should go being reinforced by the information from the latter process.
For example, copying the message "It has been very dry here without rainfall for a few weeks", if we could not copy the word "without" due to noise/QRM etc, we could speculate it as "without" from the parts before and after it. Understanding goes on in that interaction. If we could copy " something out", it must be much easier to specuate it as "without". This interaction of two different cognitive processes are essential in head copying.
The following paper may coincide with, or at least, compare to this observation with head copy. You may know how important it is to have the skill of head copying if you would fully enjoy the communication by Morse code. And, even if conversational CW extincts even in ham radio, Morse code will survive as an subject to study human epistemology in psychological and/or brain science field. It is still the simplest communication mode.
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