Keynote Speakers - 23rd Annual Meeting of the Association for the Scientific Study of Consciousness June 25 – 28, 2019, Conference by The Conference Services at Western University. Division of Housing and Ancillary Services at Western University
23rd Annual Meeting of ASSC

June 25 - June 28, 2019 | Western University, London, ON, Canada

 

Keynote Speakers

Presidential Address: Susanna Siegel


Harvard University, USA
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Does Perception Come in Degrees?

In what ways can perceptual experience encode probabilistic information? Does the fact that experience shares one interface with probabilistic information from perceptual processing, and another interface with credences, give us reason to think that perceptual experience itself comes in degrees that we can measure using probability? If so, how should we analyze the structure of experience? If not, why not?

Thomas Metzinger


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"Artificial Consciousness" Three Types of Arguments for a 30-year Global Moratorium on Synthetic Phenomenology (SP).












Lisa Miracchi


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Generating Consciousness, Generating Intelligence










Sid Kouider


Ecole Normale Supérieure, France
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Unsuspected cognition in the sleeping brain

Sleep has been argued to be the price to pay for neural plasticity: it allows optimising memory consolidation at the price of rendering organisms vulnerable to external threats. Yet, recent research reveals that the sleeping brain is actually not fully shut down from the environment, as it continues registering and integrating external events to some extent. This raises the questions of why would sleepers continue processing external information and why do they remain unresponsive at the behavioural level? Here I will argue that the sleeping brain attempts to finely balance the need to turn inward in order to optimise memory consolidation with the ability to rapidly revert to wakefulness when necessary. This leads to the hypothesis that sleepers enter a "standby mode" in which neural mechanisms aimed at tracking relevant signals in the environment remain functional. I will present several studies using neural markers of cognitive processing to show that the human brain, even after falling asleep, continues to 1) classify auditory events in a task-dependent manner, 2) rely on selective attention to resolve the cocktail party phenomenon, and 3) even form new memory contents on perpetual learning tasks. I will describe how the sleeping brain continued connection with the external world is restricted to specific sleep stages, though, and that the presence or absence of neural responsiveness can be traced back to specific sleep rhythms (e.g., slow-waves, K-complexes, spindles). Finally, I will present recent efforts in using cognitive engineering and neurotechnologies to 'hack' the mechanisms of sleep in the human brain.

Jennifer M. Windt


Monash University, Australia
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Consciousness in dreams and dreamless sleep

The investigation of sleep and dreaming has led to a continuous renegotiation of the concepts of wakefulness, sleep, and consciousness. The discovery of REM sleep and its association with dreaming showed the traditional view of sleep as a period of uniform passivity and unconsciousness to be flawed; instead, sleep was seen to consist of a complex architecture, with different sleep stages marked by characteristic changes in brain activity and outward muscular behaviour. Against philosophical resistance, the traditional dichotomy between waking consciousness and unconscious sleep was now replaced with a newer one: that between REM sleep/dreaming on the one hand and presumably dreamless and unconscious NREM sleep on the other hand. To this day, consciousness is often defined as what disappears in deep, dreamless sleep and reappears upon awakening and in dreams.

New findings, however, increasingly reveal this view to be deeply flawed. First, dreaming cannot be equated with REM sleep. Complex dreams occur in all stages of sleep, including the deep stages of NREM sleep. Also, REM sleep is not always accompanied by dreaming. This has led to attempts to define dreaming independently of sleep stages; so-called simulation views foreground the immersive structure of dream experience. Second, the characterization of dreamless sleep as uniformly unconscious also appears insufficient. Certain kinds of sleep experience lack the immersive structure of dreaming and, following simulation views, can be described as dreamless. Third, it is often assumed that sleep and wakefulness are opposite and mutually exclusive states. This idea is being challenged by different lines of research, ranging from local sleep to sleep disorders and sleep misperception in insomnia, changes in experience during sleep onset, and lucid dreams. In my talk, I'll survey empirical findings on sleep and dreaming and show how they continue to challenge common assumptions about our conscious minds. I'll also suggest that these findings necessitate radical changes to our overall taxonomy of mental states.

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