Question: I have couple of questions: 1. What is the neural mechanism for explicit memory to transfer into implicit memory? 2. How do we know we learned? 3. What is thought and thought process? 4. Is there a relation between the unimodal (in association cortices) and multimodal (in Hippocampal Pyramidal neurons) associations to thoughts/meanings/concepts? 5. What is the interpretation/physical meaning/ application in learning for low frequency stimuli ( 1Hz) - LTD activation; and High frequency stimuli (100 Hz)-activation of LTP. Help in understanding these is appreciated. Thanks.