I think we're all in agreement that the analogy between digital computers and the Brain is deeply flawed.
Just an update Amos, TTL has been superseded by CMOS but all the points you make are still valid.
Feed forward AND feedback are very important concepts when thinking about the CNS especially in connection to the senses; the Brain is not a passive receiver of information, it interrogates the external world and is in effect coupled to it.
The Thalamocortical Phase Locked Loops are a good example of this type of system.
Work is being done to use similar techniques in electronic systems such as a PLL Memory.
The complexity of the behaviour of Spiking Neurons is quit remarkable.

PP