The first book on mental deficiency. Thelwall recognized that sensory deprivation could be a cause of apparent mental defect through his work with handicapped children. He established criteria for distinguishing betwe…
Séguin was the first to outline a complete plan for the training of mental defectives. A pupil of Itard and Esquirol, he subsequently worked in America, where he published Idiocy: and its treatment by the physiologica…
When this book was published Goddard was Director of the Research Laboratory of the Training School at Vineland, New Jersey, for Feeble-minded Girls and Boys. Though this work drew wide attention to the problems of pe…
Phenylketonuria (PKU) first described. This was the first hereditary metabolic disorder shown to be responsible for mental retardation. German translation in Hoppe-Seyl. Z. physiol. Chem., 1934, 227, 169-76. English t…
