Habituation 4 Learning 4 Massed and spaced training 4 animal experiment 4 article 4 conditioning 4 controlled study 4 crab 4 habituation 4 learning 4 male nonhuman 4 Contextual conditioning 2 Crab 2 Crustacea 2 Cycloheximide 2 Freezing 2 Protein synthesis 2 animal behavior 2 cycloheximide 2 drug effect 2 escape behavior 2 hazard 2 long term memory 2 memory 2 memory consolidation 2 protein synthesis 2 state dependent learning 2 training 2 visual stimulation 2