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  1.  11
    Transcranial Direct Current Stimulation of the Motor Cortex in Waking Resting State Induces Motor Imagery.Jana Speth, Clemens Speth & Trevor A. Harley - 2015 - Consciousness and Cognition 36:298-305.
  2.  13
    The Borderlands of Waking: Quantifying the Transition From Reflective Thought to Hallucination in Sleep Onset.Clemens Speth & Jana Speth - 2016 - Consciousness and Cognition 41:57-63.
  3.  13
    A Differentiating Empirical Linguistic Analysis of Dreamer Activity in Reports of EEG-Controlled REM-Dreams and Hypnagogic Hallucinations.Jana Speth, Clemens Frenzel & Ursula Voss - 2013 - Consciousness and Cognition 22 (3):1013-1021.
    We present Activity Analysis as a new method for the quantification of subjective reports of altered states of consciousness with regard to the indicated level of simulated motor activity. Empirical linguistic activity analysis was conducted with dream reports conceived immediately after EEG-controlled periods of hypnagogic hallucinations and REM-sleep in the sleep laboratory. Reports of REM-dreams exhibited a significantly higher level of simulated physical dreamer activity, while hypnagogic hallucinations appear to be experienced mostly from the point of passive observer. This study (...)
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  4.  5
    Mental Time Travel to the Future Might Be Reduced in Sleep.Jana Speth, Astrid M. Schloerscheidt & Clemens Speth - 2017 - Consciousness and Cognition 48:180-189.
  5.  13
    A New Measure of Hallucinatory States and a Discussion of REM Sleep Dreaming as a Virtual Laboratory for the Rehearsal of Embodied Cognition.Clemens Speth & Jana Speth - 2018 - Cognitive Science 42 (1):311-333.
    Hallucinatory states are experienced not only in connection with drugs and psychopathologies but occur naturally and spontaneously across the human circadian cycle: Our nightly dreams bring multimodal experiences in the absence of adequate external stimuli. The current study proposes a new, tighter measure of these hallucinatory states: Sleep onset, REM sleep, and non-REM sleep are shown to differ with regard to motor imagery indicating interactions with a rich imaginative world, and cognitive agency that could enable sleepers to recognize their hallucinatory (...)
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  6. Auditory Verbal Experience and Agency in Waking, Sleep Onset, REM, and Non-REM Sleep.Jana Speth, Trevor A. Harley & Clemens Speth - 2017 - Cognitive Science 41 (3):723-743.
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