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M. J. WELLS
operation attack less afterwards and vice versa (Young, 1961, 1964a, b).
Maldonado interprets these results as showing that the vertical lobe
has a " general amplification " function, increasing the effects of
commands to attack originating, presumably, within the optic lobes.
He has developed an information-flow model, in which at least some
of the components are identifiable with specific lobes and tracts in the
supraoesophageal brain (Maldonado, 1963~).
Young (1963c, 1964a,b) in a series of anatomical studies, has shown
patterns of connexions within the supraoesophageal lobes strongly
suggesting that several of the lobes already known to be concerned in
sensory integration and learning function in pairs. Some of these connexions are shown in Fig. 10. Young suggests that in each case the first
member of the pair serves to enhance and the second to inhibit positive
responses to objects seen or felt. There is some experimental evidence
for this. I n the case of the median superior frontal-vertical pair, succes-