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240 according to two criteria-their objective and their subjective phenomena. (a) Objective criteria. 1. Quality of adequate stimulus. 2. Source of adequate stimulus. Location of receptors. Location of responsive organs. (b) Subjective criteria. 1. Quality of sensation. 2. Associated valence. 3. Affective valence.doi:10.1038/scientificamerican10111913-240supp fatcat:sagywlazlfdq3ekbrggvtyyck4