Barry had initially found it difficult to believe in her acquisition of stereo vision for the reason that the notion of critical period was firmly set since the groundbreaking work of Torsten Wiesel and David H. Hubel with deprivation experiments in which animals did not develop the neuronal basis for stereo vision if they were prevented from performing stereo fusion for a given time period after birth. Barry contacted Hubel, who had no difficulty in believing in her vision improvements and stated that their experiments in fact had not addressed the question whether the animals might have been able to recover stereo vision later.[14]