Related Experiment Video
Updated: Aug 10, 2026

Identification of Disease-related Spatial Covariance Patterns using Neuroimaging Data
Published on: June 26, 2013
Spatial frequency masking in positive- and negative-symptom schizophrenia
1Department of Psychology, University of Tasmania, Hobart, Australia. walter.slaghuis@utas.edu.au
Visual masking differences were found in schizophrenia patients. Individuals with negative symptoms showed impaired perception and increased masking effects compared to controls and those with positive symptoms.
Area of Science:
- Visual perception research
- Neuroscience of schizophrenia
Background:
- Schizophrenia is characterized by positive and negative symptoms, which may impact visual processing.
- Visual masking studies explore how the visual system processes stimuli under interference.
Purpose of the Study:
- To investigate visual masking differences in individuals with positive and negative symptoms of schizophrenia compared to a control group.
- To determine if transient and sustained visual channels are differentially affected in schizophrenia subtypes.
Main Methods:
- Participants included groups with positive symptoms, negative symptoms, and healthy controls.
- A 3.0 c/deg sinusoidal grating target was presented at various stimulus-onset asynchronies.
- Masking was achieved using either a 1.0 c/deg or 11.0 c/deg mask.
Main Results:
- No significant differences in target perception or masking were observed between control and positive-symptom groups.
- The negative-symptom group exhibited a higher perception threshold for the target stimulus.
- The negative-symptom group showed increased masking with the 1.0 c/deg mask, but not the 11.0 c/deg mask.
Conclusions:
- Visual masking paradigms reveal distinct differences between positive and negative symptom profiles in schizophrenia.
- Transient visual channels may be more affected in individuals with negative symptoms of schizophrenia.
More Related Videos
13:08Measurement of Fronto-limbic Activity Using an Emotional Oddball Task in Children with Familial High Risk for Schizophrenia
Published on: December 2, 2015
12:00Investigating the Effects of Antipsychotics and Schizotypy on the N400 Using Event-Related Potentials and Semantic Categorization
Published on: November 19, 2014
Related Concept Videos
Schizophrenia
Positive Symptoms Schizophrenia: Hallucinations and Delusions
Hallucinations
Hallucinations in...
Negative and Cognitive Symptoms of Schizophrenia
Negative Symptoms
Negative symptoms of schizophrenia manifest as deficits in normal emotional and behavioral functioning, profoundly impacting daily life. Individuals with schizophrenia often display a flat affect, characterized by a near-total absence of emotional expression,...
Psychological and Sociocultural Causes of Schizophrenia
Positive Symptoms of Schizophrenia: Hallucinations and Delusions
Thought Disorders
Disorganized and unusual thought processes mark thought disorders in schizophrenia. One key feature is disorganized speech, where an individual's conversation includes loosely...