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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:
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Schizophrenia Recognition Based on Gramian Angular Field Combining Activation Features: A Functional Near-Infrared

Mingxi Yang, Yulu Yang, Meiyun Xia

    IEEE Journal of Biomedical and Health Informatics
    |August 12, 2025
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    Summary
    This summary is machine-generated.

    This study introduces a new method using Gramian Angular Field (GAF) images with functional near-infrared spectroscopy (fNIRS) to improve schizophrenia (SCZ) diagnosis. The GAF approach enhances accuracy in identifying SCZ compared to traditional methods.

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    Area of Science:

    • Neuroscience
    • Medical Imaging
    • Psychiatry

    Background:

    • Schizophrenia (SCZ) incidence is rising globally, necessitating improved diagnostic tools.
    • Functional near-infrared spectroscopy with verbal fluency task (fNIRS-VFT) offers objective neurofunctional assessment but faces challenges in feature extraction and utilization.
    • Existing methods struggle with insufficient time series feature extraction, inadequate feature utilization, and unstable robustness.

    Purpose of the Study:

    • To develop and evaluate a novel fNIRS classification strategy using Gramian Angular Field (GAF) coding integrated with activation information for enhanced SCZ recognition.
    • To compare the proposed GAF-based approach with traditional fNIRS feature extraction methods and other image-based techniques.

    Main Methods:

    • Designed a fNIRS classification strategy by coding fNIRS signals into 2D Gramian Angular Field (GAF) virtual images, incorporating activation information.
    • Processed fNIRS data from 200 participants into virtual images for SCZ recognition.
    • Compared classification performance using GAF images with activation information against GAF images without activation, recurrence plots, Markov transition fields, and traditional fNIRS features.

    Main Results:

    • The GAF image coding approach integrating activation information significantly improved SCZ recognition accuracy by 7.6% over GAF without activation and 4.9% over CNN HbO signal classification.
    • ShuffleNetV2 model achieved the highest accuracy of 81.0% on the cross-validation dataset and 72.0% on an external test set.
    • The proposed method demonstrated superior performance compared to EfftivenetV2 with GAF images without activation (73.4% accuracy) and CNN HbO signals classification (75.5% accuracy).

    Conclusions:

    • Gramian Angular Field (GAF) virtual image coding, when integrated with activation information, presents a novel and effective strategy for supporting SCZ screening and diagnosis.
    • This approach enhances the application of fNIRS technology in the clinical diagnosis of psychiatric disorders.
    • The findings highlight the potential of advanced image coding techniques for objective neurofunctional assessment in psychiatry.