Proboscis extension response Apis mellifera 6 honeybee 6 learning 6 odor 6 Apoidea 4 Trophallaxis 4 article 4 controlled study 4 memory consolidation 4 nonhuman 4 olfactory discrimination 4 Analysis of Variance 2 Animals 2 Appetite 2 Article 2 Association Learning 2 Associative learning 2 Bees 2 Bombus (genus) 2 Choice Behavior 2 Conditioning, Operant 2 Food Preferences 2 Gustatory responsiveness 2 Information transfer 2 Odors 2 Olfactory Perception 2 Olfactory conditioning 2 Olfactory learning 2 Operant response 2