A threshold is a critical value beyond which some event occurs or values change drastically. In biological neorones and artificial neurons there is often no reaction for small or moderate amounts of activation from other neurons. However, if the level of input activation goes beyond some threshold, then the neuron will fully fire.
Used in Chap. 6: pages 75, 76, 78, 79, 80; Chap. 9: pages 120, 127; Chap. 10: pages 135, 136; Chap. 12: pages 163, 164, 165, 167, 171, 172, 177, 181, 187; Chap. 19: page 310; Chap. 20: page 315; Chap. 21: page 337
Also known as thresholding