This is a part of the paper "THE PERCEPTRON: A PROBABILISTIC MODEL FOR INFORMATION STORAGE AND ORGANIZATION IN THE BRAIN"
The first of these questions is in the province of sensory physiology, and is the only one for which appreciable understanding has been achieved. This article will be concerned primarily with the second and third questions, which are still subject to a vast amount of speculation, and where the few relevant facts currently supplied by neurophysiology have not yet been integrated into an acceptable theory.
Where "be subject to" seems to indicate the author is complaining the 'vast amount of speculation', and suggesting integrate the few relevant facts into an acceptable theory.
Am I misunderstanding this?