It is generally accepted that there is something special about reasoning by using mental
images. The question of how it is special, however, has never been satisfactorily spelled out …

Awakening is a crucial event for the organism. The transition from sleep to waking implies
physiological processes which lead to a new behavioural state. Spontaneous awakenings …

Objective Since Freud's “Interpretation of Dreams,” sleep has been related to emotional
functions, where dreams were assumed to play a cathartic role. In psychophysiological …

This paper describes a hypothesis related to the neurochemical background of sleep‐
waking mental activity which, although associated with subcortical structures, is principally …

Cerebral blood flow measurements during sleep are reviewed and discussed in relation to
the different techniques utilized (Positron Emission Tomography, functional Magnetic …

Since remote antiquity humankind has believed in the supernatural origin of dreaming. The
scientific approach to mental activity during sleep dates back to the eighteenth century. One …

This paper argues that dream experiences owe both their structure and meaning to
stochastic self-organizing properties of the brain during sleep. Several lines of evidence …

Right brain-damaged patients with unilateral neglect, who ignore left-sided visual events,
may also omit left-sided details when describing known places from memory. Modulating the …

The presence of spatial patterns of activity in the brain is suggestive of image-exploiting
processes in vision and mental imagery, but not conclusive. Only behavioral evidence can …

This commentary focuses on four major points:(1)“Tacit knowledge” is not a complete
explanation for imagery phenomena, if it is an explanation at all.(2) Similarities and …