These discrete trials involved breaking a behavior into its most basic functional unit and presenting the units in a series.

Functional unit latencies were between a very fast 3 clock cycles (increment add) and 29 clock cycles (floating-point divide).

However, the more original definition of subcellular functional unit in general still coexists.

Myofibrils are composed of repeating protein structures or sarcomeres, the basic functional unit of skeletal muscle.

If one functional unit was not fabricated properly, it would be switched out through on-chip wiring and another correctly functioning copy would be used.