Doktorand Rasmus Eklund
Rasmus Eklund

Detta halvtidsseminarium äger rum torsdag den 22 mars 2018, kl 10-12, i Gösta Ekmans laboratorium, Frescati Hagväg 9A.

Granskare: Lau Møller Anderson, KI (senior) och doktorand Henrik Nordström (junior).

Handledare: Professor Stefan Wiens, Psykologiska institutionen.

Abstract

Electrophysiological recordings are commonly used to study the neural correlates of consciousness in humans. Previous research is inconsistent as to whether awareness can be indexed with visual awareness negativity (VAN) at about 200 ms or if it occurs later.

The first study of my dissertation was a preregistered study with two main aims: First, to provide independent evidence for or against the presence of VAN, and second, to study whether stimulus size may account for the inconsistent findings. Subjects were shown low-contrast Gaussian filtered gratings (Gabor patches) in the four visual quadrants. Gabor size (large and small) was varied in different sessions and calibrated to each subject’s threshold of visual awareness. Event-related potentials were derived from trials in which subjects localized the Gabors correctly to capture the difference between trials in which they reported awareness versus no awareness. Bayesian analyses revealed very strong evidence for the presence of VAN for both Gabor sizes. However, there was no evidence for or against an effect of stimulus size. These findings provide evidence for VAN as an early neural correlate of awareness.

Currently we are running a preregistered study as the next part of my dissertation. The purpose of the study is to investigate the analogous process in aware hearing.

Läs mer om Rasmus Eklund.

Avdelningen för perception och psykofysik ansvarar för dagens seminarium.

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