title: The comparative psychology of communication: the issue of grammar and meaning.
mesh_terms: D000819:Animal Communication; D000818:Animals; D005075:Biological Evolution; D001921:Brain / Q000502:physiology; D003071:Cognition; D004192:Discrimination, Psychological; D000882:Haplorhini; D006801:Humans; D007257:Information Theory; D007802:Language; D049831:Octopodiformes; D011587:Psychology, Comparative; D011603:Psychophysiology; D013561:Symbolism; D014785:Vision, Ocular