The 343 CCC trigrams having the lowest association values in Witmer's 1935 list were re-evaluated. Reliability of ratings was .89 and the correlation with Witmer's values was. 79. Large changes were found in trigrams such as JFK, QJF, LBJ, LBH, HFC, GXM, DHJ, DXB, etc. There were substantial increases in values of trigrams beginning with D. New norms are presented for experimenters who need more precise control over stimulus materials.
Each trigram was flashed upon a screen for 5 sec with an opaque projector.