On the role of attention in modulating the alpha oscillation phase-dependency of cortical excitability and visual perceptio

Withdrawn

Conditions: nvt
na

Registration Number: NL-OMON37887

Lead Sponsor: Radboud Universiteit Nijmegen

Brief Summary: Not available

Detailed Description: Not available

Recruitment & Eligibility

Status: Withdrawn

Sex: Not specified

Target Recruitment: 20

Inclusion Criteria

- 18-45 years old
- Right-handed
- Normal or corrected-to-normal vision
- No history of mental or psychological disorders

Exclusion Criteria

- Pacemaker or (history of) heart rhythm disorder
- Metal parts in head or mouth*
- History of brain surgery
- History of epilepsy or first-grade family member with epilepsy
- Psychological or neurological disorder
- Skin allergies
- Pregnancy
- Prescription medication
- Being treated or having recently been treated by a medical specialist.

* with the exception of a wire behind the teeth.

Study & Design

Study Type: Interventional

Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
<p>We aim to determine the relation between the amplitude of alpha oscillations<br /><br>and the effect of their phase on visual cortical excitability and phosphene<br /><br>probability. We expect the validation of the pulsed inhibition theory<br /><br>postulating that perception is only decreased during the inhibitory phase of<br /><br>the alpha oscillation. </p><br>

Secondary Outcome Measures

Name	Time	Method
<p>In addition to the assessment of visual cortical excitability and perception by<br /><br>means of phosphene probability, the amplitude of simultaneously recorded TEPs<br /><br>will be employed as an additional measure of phase-dependent cortical<br /><br>excitability (Bergmann et al., 2012). </p><br>