THE EFFECT OF EARLY AND LATE BRA.IN INJURY UPON TEST SCORES, AND
THE NATURE OF NORMAL ADULT INTELLIGENCED. O. HEBBQuwi's
Univ~r~itr,1 Kingstcn, Ontario
AllST1duraJ space 111 the right hemisphere in its dorso-parietal
aspect. Dr. Arthur Chilek, radiolo gist, and Dr. Cone agreed on
stereoscopic study of chc X-ray places thal lhc dc::;11uc.;tiv11 vu
Lltt! 1 i~l1t side was certainly 40 per cent, possibly 50 per cent
of the total mass of the right hemisphere, and that the dcsrruetie
of the left (by pressure only} ,vas at least 20 per cert of the
left hemisphere. This would mean a diffuse destruction of 30 to 35
per cent of the rnasa of the ccrchru1n-2C to 2$ per cent 011 the
right, 10 per cent on the lc!t side. Since the estimation of
quantity was difficull it ni~y be said tl13.t the clestruction was
net less than ZO per cent, and probably more than 25 per cent of
the rnass oi the cerebrum, with an upper limit nf probably 35 pP.r
~t:nt, possibly :l!S- high 3~ 40per cent.The patient's
psychological status appeared tohf' exceptionally eoocl. The one
defect. by in formal observation, was his inactivity, and ap patent
willingness to do nothing for rather Jong periods. But in
conversation he seemed normally alert and responsive. and quite
co-operative. Hismemory was good : he. knew the names of nurses who
spoke to him, a1xl after being told the ex aminer's name once
-ememhered it readily the next r.ay. He knew the date, the name of
the hospital and the city he was i11; the name of the present king
of Engla-id, Ccnrge VI. of the pre ceding king (Edward VIII) a"J
the approximate elate of George V's r.enrh. He answered ques tions
about approximate distances of his home [rorn other cities
correctly and readily.Psyehomerrc examination was limited by his
almost complete visual defect. The Stanfnr1. P.ryr/10/., 1939, 21,
437-446.Haas. D. 0. Ditto: report of four left f rental lobecases.
J. G~u. Ps:>r.hol. 19J9a, 21, 73-87.Hese, D. 0. Human
inu:.lljgeoce a her removal of tissue Irom the right ironta1 lobe.
J. Gen. P~ychaJ., 1941. October,-.flv,a:B, 0. 0., ..\Sb PF.NTtBLD,
W. Human behavior after extensive bilateral removal Irom the
[rental lobes. Arch. Neer, & P~-yY, F., ANU \Vcu.. F, A. 'The
relationship of intel.. lcct to speech defect in aphasic patients.
J. Nero.,\fo,1. ou; 193
