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Blind Procedures

Blind Procedures

Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which...

The Placebo Effect

The Placebo Effect

The placebo effect occurs when people's expectations or beliefs influence or determine their experience in a given situation. In other words, simply expecting something to happen can actually make it happen.

Blinding

Blinding

Blinding is a commonly used method of not telling participants which treatment a subject is receiving. Blinding is a critical part of a randomized control trial or RCT. It reduces the bias that affects the results. In an RCT, blinding is used in the form of a placebo. A placebo effect occurs when untreated subjects falsely believe they have received the treatment and report improved symptoms. A placebo or a dummy treatment is administered to subjects to negate the bias caused by such an effect.

Brain Imaging

Brain Imaging

Brain imaging technologies provide critical insights into both the structure and function of the human brain, enabling medical professionals and researchers to diagnose, study, and treat neurological disorders or psychiatric disorders more effectively.
These technologies include computerized axial tomography (CAT or CT scans), positron-emission tomography (PET scans), magnetic resonance imaging (MRI), functional magnetic resonance imaging (fMRI), and Transcranial Magnetic...

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Placebo treatment can alter primary visual cortex activity and connectivity.

A Schienle¹, S Übel¹, W Scharmüller¹

¹Department of Clinical Psychology, University of Graz, Universitätsplatz 2/III, A-8010 Graz, Austria.

|January 21, 2014

Summary

Placebo treatments can reduce experienced disgust by altering brain activity in visual and emotional processing regions. This suggests placebos impact basic perception and emotional regulation.

Keywords:

affective pictures disgust fMRI functional connectivity placebo

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Area of Science:

Neuroscience
Psychology
Medical Imaging

Background:

Placebo effects are known to modulate brain activity in areas related to emotion processing and cognitive control.
The extent to which placebos influence basic sensory perception, such as visual processing, remains less understood.

Purpose of the Study:

To investigate if placebo administration can modulate visual cortex activity and its connectivity during the perception of affective images.
To explore the impact of placebos on primary visual cortex responses and its interaction with emotion-related brain regions.

Main Methods:

Functional magnetic resonance imaging (fMRI) was used to measure brain activity.
Participants viewed disgusting, fear-eliciting, and neutral images under placebo and no-placebo conditions in a retest design.
The placebo involved an inert pill presented with the suggestion of reduced disgust symptoms.

Main Results:

The placebo significantly reduced participants' experienced disgust.
A decrease in primary visual cortex activation was observed during the placebo condition.
Reduced interaction between the visual cortex, amygdala, and insula was noted with placebo administration.

Conclusions:

Placebo interventions can influence basic perceptual processes, including visual cortex activity.
The findings demonstrate that placebo effects extend beyond higher-level cognitive and emotional control to sensory perception.
Placebos show a capacity to modulate neural pathways involved in processing affective stimuli.