A modification of the theory that the pseudo-reminiscence is an unrecognised real reminiscence is furnished by Grasset, who considers that the phenomenon is due to a subconscious impression previously received, but only reaching consciousness under the influence of the new similar impression. This theory would include the revival of dream images, and is therefore related to the theory of Lapie and Méré, according to which the feeling of many of these subjects that what they now experience had happened before in a dream is the correct explanation of the phenomenon.[222] We enter on a different class of explanations with the early theory of Wigan that such cases are due to the duality of the brain, the two hemispheres not acting quite simultaneously. This is a somewhat crude conception, though it may seem approximately on the lines of more recent theories. The theory of the duplex brain, each hemisphere being supposed capable of acting independently, was at one time invoked to explain many phenomena, but it is no longer regarded as tenable.[223] We may dismiss these theories, which have been effectively criticised by others, and revert to our clue in the sleeping and hypnagogic state. The hypnagogic state is a transition between waking and sleeping. It is thus a condition of mental feebleness and suggestibility doubtless correlated with a condition of irregular brain anaemia. A plausible suggestion under such conditions is too readily accepted. Does ordinary paramnesia occur under similar conditions of mental feebleness and suggestibility? It is rare to find descriptions of paramnesic experiences by scientific observers who are alive to the importance of accurately recording all the conditions, but there is some reason to think that paramnesia does occur in states produced by excitement, exhaustion, and allied causes. The earliest case of paramnesia recorded in detail by a trained observer is that described by Wigan as occurring to himself at the funeral of the Princess Charlotte. He had passed several disturbed nights previous to the ceremony, with almost complete deprivation of rest on the night immediately preceding; he was suffering from grief as well as from exhaustion from want of food; he had been standing for four hours, and would have fainted on taking his place by the coffin if it had not been for the excitement of the occasion. When the music ceased the coffin slowly sank in absolute silence, broken by an outburst of grief from the bereaved husband. 'In an instant,' Wigan proceeds, 'I felt not merely an _impression_, but a _conviction_, that I had seen the whole scene before on some former occasion.' Such a condition may fairly be regarded as an artificial reproduction, by means of emotion, excitement, and exhaustion, of the condition which occurs simply and naturally in sleep or on its hypnagogic borderland.