"Rationale for Treatment with LSD and UML Our interest in these drugs was due in part to their psychotomimetic effect, hoping thereby that the autistic defenses of schizophrenic children might be broken down. Of equal interest, on a theoretical basis, is the serotonin inhibiting effect and of greater interest is their effect on the autonomic and central nervous system. Brodie has described the effects of LSD and other hallucinogenic agents as "arousal and increased responsiveness to sensory stimuli, preponderance of sympathetic activity and increased skeletal muscle tone and activity." Of particular interest is their tonic effect on the vascular bed especially of the brain, as has been shown with UML in vascular headaches. The known effects of these drugs on perception further increases their interest in the treatment of schizophrenia. Such drugs were of interest to us for the treatment of childhood schizophrenia since our definition of this condition is a disorder in maturation characterized by an embryonic primitive plasticity in all areas of integrative brain functioning from which behavior subsequently arises. This includes all autonomic functions, perception, emotion, intelligence. It was hoped that 'these drugs might prove some-what specific in modifying the basic process as well as the secondary symptoms. Autism is seen as a withdrawal or denial defense against disturbing sensations arising from disturbed autonomic function and perceptual function and anxiety in the young child with lagging and atypical maturation. It was hoped that this autism might be disrupted and that more normal autonomic functions in the vascular bed, brain, intestines, skin and other organs as well as in perception would permit more normal development."