“…Nonspecific auditory, visual, and tactile projections to association areas of the cortex have been demonstrated in the chloralosed cat (Albe-Fessard & Rougeul, 1958;Buser, Borenstein, & Bruner, 1959;Thompson, Johnson, & Hoopes, 1963). In the normal waking animal both gross and single-cell responses in association areas are sensitively dependent upon the behavioral "significance" of stimuli of all three modalities (Thompson & Bettinger, in press;Thompson, Bettinger, Birch, Groves, & Mayers, 1969;Thompson & Shaw, 1965). Ablation of these cortical regions prevents subsequent development of auditory-visual sensory preconditioning (Thompson & Kramer, 1965).…”