On the other hand, a complex may be strongly organized and include a large number of details of an experience. This is usually owing to the fact that the original experience was accompanied by strong emotional tones, or by marked interest and attention, or was frequently repeated. =Emotional Complexes=: 1. When the original experience was accompanied by an emotion it may be regarded as having excited one or more of the emotional instincts of anger, fear, disgust, etc. The excitation of the instinct or instincts is in one sense a _reaction_ to the ideas of the experience. The instincts then become organized about one or more of the ideas to form a sentiment (Shand) and the whole is incorporated in a complex which then acquires an affective character. The impulsive force of the instinct thereafter largely determines the behavior of the complex. (To this we shall return later when we consider the instincts.) General observation shows that emotional experiences are more likely to be conserved and also voluntarily recalled. Given such an emotional complex nearly anything associated with some detail of the experience may, by the law of association, automatically or involuntarily revive it, or the emotional reaction with a greater or less number of its associated memories. This tendency seems to be directly proportionate to the intensity of the instinct (fear, anger, etc.) incorporated in the complex. Sometimes, it is true, a strongly emotional experience, even an experience of great moment in an individual’s life, is completely forgotten, so completely that no associated idea avails as a stimulus to awaken it. Usually in all such cases the neurograms are isolated, etc., by dissociation. They still, however, may be strongly organized and conserved as an unconscious complex and sometimes may be excited as a subconscious process by an associated stimulus. In such conditions it very frequently is found that the dissociation is due to conflict between the emotion belonging to the complex and another emotional complex. The impulsive force of the latter dissociates the former complex which then cannot be voluntarily reproduced as memory, nor awakened by any association under normal conditions. We have then a condition of amnesia and often an hysterical condition. To this important phenomenon we shall return when we consider the emotions. Passing over these exceptional conditions of conflicting emotions (which being explained “prove the rule”), it still remains true that in everyday life emotional experiences are not only more likely to be conserved but to be subject to voluntary recall, or awakened involuntarily by an associated stimulus.