NCT04643340

Imaging During Subliminal Perception

Functional Imaging During Subliminal Perception

• Status: Completed
• Phase: —
• Study type: Observational
• Enrollment: 70 (actual)
• Sponsor: University of Zurich · Academic / Other
• Sex: All
• Age: 18 Years – 80 Years
• Healthy volunteers: Accepted

Summary

Subliminal perception of visual stimuli can be studied with functional brain imaging, e.g. with functional magnetic resonance imaging (fMRI). However, it is unclear how subliminal perception affects connectivity in the brain. Further, it is not known if real-time (rt) fMRI neurofeedback of brain areas involved in subliminal perception can lead to supra-threshold perception. For attention tasks, the investigators hypothesize that functional connectivity strength is mediated by the insular cortex during both supra-threshold and subliminal perception. Additionally, the investigators hypothesize that rt-fMRI neurofeedback training should alter neuronal and behavioral responses.

Detailed description

In this project, using healthy adults, the investigators have 2 aims: 1. Apply electroencephalography (EEG) and fMRI before and after rt-fMRI neurofeedback during attention tasks to identify brain regions involved in subliminal and supraliminal perception. 2. Apply functional connectivity analyses during these tasks.

Conditions

• Healthy

Interventions

Type	Name	Description
OTHER	real-time fMRI	Brain regions can be trained, i.e. fMRI activity can be actively modulated online by humans, using rt-fMRI (Bruhl, Scherpiet et al. 2014, Bruhl 2015, Emmert, Kopel et al. 2016).

Timeline

• Start date: 2020-03-15
• Primary completion: 2021-12-01
• Completion: 2022-12-01
• First posted: 2020-11-25
• Last updated: 2023-06-13

Locations

1 site across 1 country: Switzerland