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  1. Brain Stimulation and Conscious Experience.Daniel A. Pollen - 2004 - Consciousness and Cognition 13 (3):626-645.
    Libet discovered that a substantial duration (> 0.5-1.0 s) of direct electrical stimulation of the surface of the somatosensory cortex at threshold currents is required before human subjects can report that a conscious somatosensory experience had occurred. Using a reaction time method we confirm that a similarly long stimulation duration at threshold currents is required for activation of elementary visual experiences (phosphenes) in human subjects following stimulation of the surface of the striate cortex. However, the reaction times for the subject (...)
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  • The Neural Bases of Multistable Perception.Philipp Sterzer, Andreas Kleinschmidt & Geraint Rees - 2009 - Trends in Cognitive Sciences 13 (7):310-318.
  • The Timing of Brain Events: Reply to the “Special Section” in This Journal of September 2004, Edited by Susan Pockett.Benjamin Libet - 2006 - Consciousness and Cognition 15 (3):540-547.
    In this “Reply” paper, the arguments and experimental findings by Pockett, Pollen, and Haggard et al. are analyzed. It had been shown that a 0.5 s duration of repetitive activations of sensory cortex is required to produce a threshold of sensation. The view that this is due to a facilitatory buildup in excitatory state to finally elicit neuronal firing is shown to be incompatible with several lines of evidence. Objections to the phenomenon of subjective referral backwards in time are also (...)
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