Analysis is based on published Talairach coordinates of foci whose activity was significant at p 3.09).
Bottom row: subcortical foci (left) and ventral view of cortical surface (right). Middle row: cortical surface, medial view. Meta-analysis of relative increases and decreases in neuronal activity during REM sleep as seen with PET imaging using H2 15O measurements of regional cerebral blood flow (rCBF) or -flurodeoxyglucose measurements of glucose metabolism. Yet, as we shall see, encouraging progress has been made in relating the phenomenology of dreams to underlying brain activity, and to studies of brain damage and development.įunctional neuroanatomy of human REM sleep: a meta-analysis of PET results to focus on properties of all dreams rather than to investigate the neural correlates of a particular dream. Therefore, it is difficult to predict the contents of specific dreams, and most modern dream research tries to relate neuronal activity retrospectively to dream form rather than dream content, i.e. The study of dreams is a formidable task, because dream consciousness is only accessible via report rather than direct observation ( Box 1) and because it is difficult to manipulate dream content experimentally, whether by exposure to stimuli before or during sleep. In The interpretation of dreams Freud predicted that “Deeper research will one day trace the path further and discover an organic basis for the mental event.” Recent work, which we review in this article, begins to fulfill Freud s prediction. Although dreams have fascinated us since the dawn of time, their rigorous, scientific study is a recent development ( Supplementary Fig.
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