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 neorons. However, if the level of input activation goes beyond some threshold, then the neuron will fully fire.
Defined on page 246
Used on Chap. 6: pages 110, 114, 115, 116, 120; Chap. 9: pages 180, 181, 192, 193; Chap. 10: pages 204, 205; Chap. 12: pages 246, 248, 249, 250, 253, 255, 259, 260, 261, 262, 269, 276, 286; Chap. 19: page 481; Chap. 20: page 490; Chap. 21: page 523
Also known as thresholding