Thought I'd share something one of my behaviourism lecturers told me, before we started our semester long flash card SRS project*:
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You are being trained to write characters, not to make whatever facial expression/noise you make when "thinking / trying to remember something". It is quite clear if you don't remember it - you will know within 1-2 seconds of being prompted. If the desired response does not come immediately, reveal the answer, say it aloud (important) and move on.
Key:
If you don't know it, press reveal straight away, say it aloud, move on to the next one.
Whether you may have *got it* after a short period of thinking is doesn't matter: the goal is to instantly recognize / be able to write / define a word.
Do this and you will avoid training irrelevant behaviours, and focus on improving your ability to instantly recall the desired response.
*We had to memorize 60+ behaviourism terms to the point where we could recall at least 30 with less than 5% error in one minute. We used flash cards and recorded our progress, quite similar to Skritter's method (only without the auto-SRS)