Synthesized answer
The provided passages do not contain information about what questions remain unanswered in "The Computer and the Brain" by John Von Neumann. The available passage only includes the title of the book and a description of its second edition, mentioning a foreword by Churchland & Churchland [1]. Therefore, it is not possible to answer the question based on the given text.
Synthesized from the book passages below. Chat with the book on Feynman for follow-up.
From the book
Title: The computer and the brain by John Von Neumann Description: This second edition has a foreword by Churchland & Churchland (c) 2000