Long-Term Memory, Simulated Qubits, Physical Qubits - Brain Theory from a Circuits and Systems Perspective - page 66

Fig. 4.7 Waveform sampling; z is either true (a pulse burst) or false (at rest)

available. Figure 4.7 illustrates how a sample might be taken. The weak synapse can
produce a single pulse, Pulse(1) that will have a given pulse width , discussed

below. If a single pulse happens to occur at the same time as a multivibrator pulse at
the input of the AND gate, there will be a pulse at the output of the gate. This will
trigger a long-term memory neuron to provide a regular burst at point z.
Two kinds of sampling may be identified: (1) Systematic and (2) Random.

δ

Systematic Sampling

Systematic sampling is envisioned as being done assuming multivibrator frequency
is either 0 or f 1 ; then either a true or a false will result with 100 % probability no
matter when a sample is taken. A systematic sampling pulse might work for certain
types of toggling circuits to make a simple true or false available in a timely way.

Random Sampling

In practice, pulses generated within the brain are likely to occur at convoluted times
because of the differing locations of brain activities, and because such pulses are not
synchronized with simulated qubit pulses. Such pulses are pseudorandom and often
may substitute for random.
Truly random pulses might be generated in a receptor, one that is not part of a
synapse, as suggested in Fig. 4.8 . Such receptors are proposed as having a special
structure so that they are sensitive only to especially energetic impinging ions,
a random event, and so would generate a random dendritic pulse. Practical issues
are that a truly random pulse might fail to occur when it is needed, or successive