The studies performed by the trio on fish, insects and birds laid the foundation for further studies on the importance of specific experiences during critical periods of normal development, as well as the effects of abnormal psychosocial situations in mammals. At the time, these discoveries were stated to have caused "a breakthrough in the understanding of the mechanisms behind various symptoms of psychiatric disease, such as anguish, compulsive obsession, stereotypic behaviour and catatonic posture". Tinbergen's contribution to these studies included the testing of the hypotheses of Lorenz/von Frisch by means of "comprehensive, careful, and ingenious experiments" as well as his work on supernormal stimuli. The work of Tinbergen during this time was also regarded as having possible implications for further research in child development and behaviour.