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Related Concept Videos

Visual Agnosia01:12

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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Association areas are regions of the cerebral cortex that do not have a specific sensory or motor function. Instead, they integrate and interpret information from various sources to enable higher cognitive processes such as memory, learning, and decision-making. Some key association areas include the following:
Prefrontal Association Area: This area is located in the frontal lobe and is involved in planning, decision-making, and moderating social behavior. It connects with primary motor areas,...
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Related Experiment Video

Updated: Mar 8, 2026

Measurement of Fronto-limbic Activity Using an Emotional Oddball Task in Children with Familial High Risk for Schizophrenia
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Functional connectivity when detecting rare visual targets in schizophrenia.

Amy M Jimenez1, Junghee Lee1, Michael F Green1

  • 1Desert Pacific MIRECC, VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA; Department of Psychiatry and Biobehavioral Sciences, University of California, Los Angeles, CA, USA.

Psychiatry Research. Neuroimaging
|January 28, 2017
PubMed
Summary
This summary is machine-generated.

Schizophrenia patients show reduced functional connectivity between dorsal and ventral attention networks. This deficit may impair their ability to process important visual targets amidst distractors.

Keywords:
AttentionOddballPsychophysiological interactionSalienceTarget detectionfMRI

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Area of Science:

  • Neuroscience
  • Cognitive Neuroscience
  • Psychiatry

Background:

  • Individuals with schizophrenia often exhibit impaired attention, struggling to focus on relevant information and filter out distractions.
  • Understanding the neural underpinnings of these attentional deficits is crucial for elucidating the pathophysiology of schizophrenia.

Purpose of the Study:

  • To investigate functional connectivity within and between the ventral and dorsal attention networks during a visual attention task in schizophrenia.
  • To determine the role of these networks in detecting rare visual targets.

Main Methods:

  • A visual oddball task was employed during functional magnetic resonance imaging (fMRI) in 25 schizophrenia patients and 27 healthy controls.
  • Psychophysiological interaction (PPI) analysis was used with seed regions in the right temporoparietal junction (TPJ) for the ventral network and the right medial intraparietal sulcus (IPS) for the dorsal network.

Main Results:

  • Healthy controls exhibited significantly greater functional connectivity between the right IPS (dorsal network) and the right anterior insula (AI; ventral network) compared to patients.
  • Expected within- and between-network connectivity patterns for the right TPJ were observed in controls but not significantly different in patients.

Conclusions:

  • Schizophrenia is associated with functional connectivity deficits between the dorsal and ventral attention networks.
  • These disruptions may underlie difficulties in processing relevant versus irrelevant stimuli, contributing to cognitive impairments in schizophrenia.