Reading focus
Syllabus: How Can We Study Conscious Experience?
Track the distinction between experience, enabling conditions, and consequences rather than assigning each a fixed moment in time.
Why you’re reading it. Develop a framework for interpreting the neural contrasts used throughout the remaining readings.
A question to consider. If a signal predicts a seen stimulus before it appears, what role could it have and what experiment would distinguish that role from a consequence of seeing?
Why this reading
A brain signal that differs between seen and unseen trials could help produce an experience, accompany it, or follow from remembering and reporting it. Aru and colleagues distinguish these possibilities and propose comparisons that could separate them. The paper turns a familiar imaging contrast into a problem of inference.
Before you read
Contrastive analysis compares neural activity across conditions that differ in reported awareness. The authors distinguish the neural correlates of experience itself, prerequisites that enable it, and consequences that follow from it. These categories describe proposed roles; their timing can overlap. EEG measures electrical activity, while TMS briefly perturbs neural activity with a magnetic pulse.
Read for
- Use Figures 2 and 3 to explain why identical stimuli and different reports do not isolate experience by themselves.
- Assess the proposed manipulations of expectations, attention, memory, and neural activity. What must remain comparable for a difference to identify a prerequisite or consequence?
Consider afterwards
- A signal disappears when a memory task is removed, while reported visibility remains similar. What does this suggest, and which alternative needs checking?
- Why does disrupting perception fail, by itself, to distinguish an enabling process from the substrate of experience?
Editorial context
The framework identifies a specificity problem; it does not invalidate every contrastive study or classify every brain region conclusively. Its interpretation depends partly on what a theory takes experience to include. Later work on report requirements makes the problem experimentally tractable, while leaving measurement and attention assumptions open. Temporal order alone cannot resolve it.