The biological band, which is situated just below the cognitive band in the time scale of human action, is characterized by the physiological properties of neurons. The neural level, within the biological band, is a strong level and may be described in terms of well-specified behavior laws (e.g., Hodgkin-Huxley action potential propagation, Rall's cable equations, etc.). Above the neural level however, is the neural circuit level which has not been as carefully scrutinized as the neuron level. The medium of transaction in this neural ciruit level is activation. The action of this level may be considered as symbol access, with patterns of activation across a number of neurons corresponding to a specific symbol. The biological band is the chief concern of connectionist reseachers and the addition of specific organization to neural circuits leads to an approximation of the lower levels of the cognitive band.