In 1983, ethologist Nikolas Tinbergen published a book recommending the use of holding therapy by parents as a treatment or "cure" for autistic children. Tinbergen based his ideas on his methods of observational study of birds. Parents were advised to hold their autistic children despite resistance and to endeavor to maintain eye contact and share emotions. Tinbergen believed that autism related to a failure in the bond between mother and child caused by "traumatic influences" and that enforced holding and eye contact could establish such a relationship and rescue the child from autism. Tinbergen's interpretations of autism were without scientific rigor and were contrary to the then growing acceptance that autism had a genetic cause. Despite the lack of a sound theoretical or scientific base, holding therapy as a treatment for autism is still practiced in some parts of the world, notably Europe.