In the Internal Phase, phrenes become the temporal pattern of sensations associated with respiratory changes. These come from the diaphragm, the intercostal muscles of the rib-cage, and the smooth muscles surrounding the bronchial tubes which regulate their bore and so the resistance of them to the passage of air, this mechanism being controlled by the sympathetic nervous system. We should remember here how extremely responsive our breathing is to various types of environmental stimulation. A sudden stimulus, and we 'catch our breath'. Sobbing and laugh-ing have obvious distinct internal stimulation from the diaphragm and intercostals. In great activity or excitement, there is an increase in both the rate and depth of breathing with the resulting internal stimulation. Either pleasantness or unpleasantness usually shows increased breathing. Momentary attention 264 The Witness of History is clearly correlated with partial or complete inhibition of breathing. A surprise, and our rate of breathing increases and becomes irregular. Apart from rate, there are also unique changes in the proportion of time occupied by inspiration and by expiration in a single breath cycle. This is best measured by determining the percent of the duration of the breath cycle taken up by inspiration. This is about 16 percent in speech, 23 percent in laughter, 30 percent in attentive mental work, 43 percent when at rest, 60 percent or more in excitement, 71 percent in subjects imagining a wonderful or surprising situation, and 75 percent in sudden fright.3 The point I am trying to make here is that our phrenes or respiratory apparatus can almost be looked at as recording everything we do in quite distinct and distinguishable ways.

• time
• work
• stimulus
• attention
• speech
• nervous system
• history
• activity
• situation