精神分裂症患者和对照组在轮廓整合任务中的表现与轮廓形状的函数关系

IF 1.5 4区 心理学 Q4 NEUROSCIENCES
Samyukta Jayakumar , Anthony O. Ahmed , Pamela D. Butler , Steven M. Silverstein , Judy L. Thompson , Aaron R. Seitz
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引用次数: 0

摘要

轮廓整合(CI)是将元素特征整合到物体中的能力,是感知和识别物体以及在视觉环境中发挥作用所必需的基本视觉过程。目前有大量资料表明,精神分裂症(SZ)患者除了有认知障碍外,还存在多种视觉感知缺陷,包括轮廓整合(CI)。在这里,我们回顾性地描述了精神分裂症患者和神经畸形患者(NT)在一系列由 Gabor 元素组成的轮廓形状上的表现,这些轮廓形状的闭合度和曲率各不相同。两组参与者都进行了一项 CI 训练任务,其中包括 7 个不同的形状系列(直线、椭圆、团块状、方形、螺旋状、圆形和字母),共进行了多达 40 次训练。在训练任务中对两个参数进行了处理:方向抖动(OJ,即每个形状的单个 Gabor 元素与理想方向的偏差)和诱导数(IN,即定义形状的 Gabor 元素的数量)。结果显示,OJ阈值和IN阈值在各组之间存在显著差异,对照组的OJ阈值更高,IN阈值更低。此外,我们还发现,轮廓形状的函数也会产生明显的影响,当轮廓被认为更复杂时,组间的差异就会出现,例如,由于具有更高的曲率(Blobs、Spiral、Letters),组间的差异就会出现。这些数据可以为今后研究精神分裂症患者视觉整合障碍的工作提供参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Performance on a contour integration task as a function of contour shape in schizophrenia and controls

Performance on a contour integration task as a function of contour shape in schizophrenia and controls

Contour Integration (CI) is the ability to integrate elemental features into objects and is a basic visual process essential for object perception and recognition, and for functioning in visual environments. It is now well documented that people with schizophrenia (SZ), in addition to having cognitive impairments, also have several visual perceptual deficits, including in CI. Here, we retrospectively characterize the performance of both SZ and neurotypical individuals (NT) on a series of contour shapes, made up of Gabor elements, that varied in terms of closure and curvature. Participants in both groups performed a CI training task that included 7 different families of shapes (Lines, Ellipse, Blobs, Squiggles, Spiral, Circle and Letters) for up to 40 sessions. Two parameters were manipulated in the training task: Orientation Jitter (OJ, i.e., orientation deviations of individual Gabor elements from ideal for each shape) and Inducer Number (IN, i.e., number of Gabor elements defining the shape). Results show that both OJ and IN thresholds significantly differed between the groups, with higher (OJ) and lower (IN) thresholds observed in the controls. Furthermore, we found significant effects as a function of the contour shapes, with differences between groups emerging with contours that were considered more complex, e.g., due to having a higher degree of curvature (Blobs, Spiral, Letters). These data can inform future work that aims to characterize visual integration impairments in schizophrenia.

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来源期刊
Vision Research
Vision Research 医学-神经科学
CiteScore
3.70
自引率
16.70%
发文量
111
审稿时长
66 days
期刊介绍: Vision Research is a journal devoted to the functional aspects of human, vertebrate and invertebrate vision and publishes experimental and observational studies, reviews, and theoretical and computational analyses. Vision Research also publishes clinical studies relevant to normal visual function and basic research relevant to visual dysfunction or its clinical investigation. Functional aspects of vision is interpreted broadly, ranging from molecular and cellular function to perception and behavior. Detailed descriptions are encouraged but enough introductory background should be included for non-specialists. Theoretical and computational papers should give a sense of order to the facts or point to new verifiable observations. Papers dealing with questions in the history of vision science should stress the development of ideas in the field.
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