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Thcrc is, as TW have seen, much c~vitlence, both clinical and experimental,
that can be used to support these theories.“’ SO. li5f RS, w The t hcorics, howr’vt~r’, arc
not explicit enough, it seems, and they ha\e not, been prowd beyond an?- doubt.
Nerertheless, they appear valuable as stimuli and as l\orking hppothwrs for
further research in the field. Rincc so many observations apptlar Incompatible
with older views, we should keep an opw mind and look I’or c~xplanations and
theories that would be in agreement with all the known facts.
The author’s own research reported here has been supported by grants from The Sigrid
Juselius Foundation, Helsinki, Finland, and from the National Inst,itutes of Dcmtal Research
(Dl434, DE-01793) and of Child Health am1 Human Development (HI)-001 771, United
States Public Health Service.
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