Related Experiment Video
Updated: Jul 13, 2026
05:14
Standardized Data Acquisition for Neuromelanin-Sensitive Magnetic Resonance Imaging of the Substantia Nigra
Published on: September 8, 2021
Mismatch negativity in patients with schizophrenia
Ales Urban1, Jan Kremlácek, Jan Libiger
1Charles University in Prague, Faculty of Medicine in Hradec Králové, Department of Psychiatry, Czech Republic. a.urban@centrum.cz
Acta Medica (Hradec Kralove)
|July 28, 2007
Summary
Cognitive deficits in schizophrenia can be measured using mismatch negativity (MMN), an event-related potential. This preattentive measure shows promise for improving schizophrenia diagnosis and functional assessment.
Area of Science:
- Neuroscience
- Psychiatry
- Cognitive Science
Background:
- Cognitive deficits are core to schizophrenia, impacting social function and prognosis.
- Traditional neuropsychological tests can be confounded by attention and effort.
Purpose of the Study:
- To explore the utility of mismatch negativity (MMN) as a measure of cognitive function in schizophrenia.
- To assess MMN's potential for improving diagnostic precision and functional evaluation in schizophrenia.
Main Methods:
- Utilizing event-related potentials (ERPs) to study cognitive functions.
- Measuring amplitude changes in the slow negative component of evoked responses, known as MMN.
- Investigating MMN's association with infrequent stimulus deviations in patients with schizophrenia.
Main Results:
- An association was identified between MMN amplitude changes and infrequent auditory stimuli in schizophrenia patients.
- MMN is considered independent of focused attention and effort, unlike some neuropsychological tests.
Conclusions:
- MMN serves as a potential preattentive cognitive measure.
- MMN may enhance the accuracy of schizophrenia diagnosis and functional assessment.
Related Concept Videos
01:30Negative and Cognitive Symptoms of Schizophrenia
Negative symptoms of schizophrenia indicate a reduction or absence of typical behaviors and emotional responses found in healthy individuals, while positive symptoms reflect an excess or distortion of normal functioning.
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,...
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,...
01:20Mismatch Repair
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
01:36Mismatch Repair
Overview
01:30Positive Symptoms of Schizophrenia: Hallucinations and Delusions
Schizophrenia is a complex mental health disorder that can manifest with various positive symptoms, including thought, movement, and behavior disorders. These symptoms significantly disrupt cognitive and motor functions, leading to profound effects on an individual's ability to engage with the world.
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...
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...
01:29Psychological and Sociocultural Causes of Schizophrenia
Schizophrenia, a complex psychiatric disorder, has been historically misunderstood. Early psychological theories attributed its origins to childhood trauma and unresponsive parenting. However, contemporary research largely rejects these notions, favoring the vulnerability-stress hypothesis. This model proposes that individuals with a genetic predisposition to schizophrenia may develop the disorder following exposure to significant environmental stressors. Notably, studies on high-risk...
01:17Sign Test for Matched Pairs
The sign test for matched pairs offers a robust method for comparing two paired samples, often for the effects of an intervention in one of them. This method is very useful in situations where the underlying distribution of the data is unknown. The test compares two related samples—often pre- and post-treatment measurements on the same subjects—to determine if there are significant differences in their median values.
To conduct the sign test, we first calculate the differences in value between...
To conduct the sign test, we first calculate the differences in value between...