Gamma Bias
Gamma bias is gamma motor neurons' consistent level of activity. Smaller neurons require a smaller amount of excitatory input to reach its threshold compared to larger neurons. Therefore, gamma motor neurons (smaller in size than alpha motor neurons) are more likely to fire than the larger alpha motor neurons. This creates a situation with relatively few alpha motor neurons firing but some gamma motor neurons constantly firing in conditions where muscle stretch or force is not occurring. The sensitivity of sensory endings (primary and secondary endings - Ia, Ib, II) of the muscle spindle are based on the level of gamma bias (ie. how much background level of gamma motor neuron discharge is taking place.)
Read more about this topic: Gamma Motoneuron
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