Natural instincts were thought to play a very small role in determining human behavior. In 1951, Dutch biologist and Nobel Prizewinner Nikolaas Tinbergen published “A Study of Instinct”. This was to be a highly influential book. Tinbergen classified behavior based on natural instincts and not affected by the learning process.
These theories remain the foundation for all further studies on child development, but there were others that define innate behavior differently.
In this book “The Language Instinct”, the wonderful genius Steven Pinker theorizes that language acquisition is an instinctive behavior.