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This book is an attempt by Forrer to develop a theory relating human development and the weaning process. The basic assumption of the book is that the foundations of human behavior are primarily preoedipal. In fact, Forrer's thesis is that oral strivings are even more important than sexual strivings and, therefore, he proposes to examine the weaning process for new clues to the genetic origins of a variety of human behavior.
Beginning with the oral instinct, we already know that its aim is satiation and the object is food. The important aspect of the oral instinct is the process of incorporation of food. Forrer further argues that if the aim of the oral instinct is to incorporate food and if the aim of the ear is to incorporate sound waves and of the eye light waves, then it is possible that any receptive sensory mechanism can
Woude KV. Weaning and Human Development.. Arch Gen Psychiatry. 1970;22(3):286–287. doi:10.1001/archpsyc.1970.01740270094013