Lateralized Effects in Troxler Fading and Parvo and Magnocellular Processing Tasks after Localized 1Hz rTMS.
Lateralized Effects in Troxler Fading and Parvo and Magnocellular Processing Tasks after Localized 1Hz rTMS.
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发表时间：
2021
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通讯作者：
Mennemeier MS
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作者：
Taylor-Cooke PA;Chacko JG;Chelette K;Mennemeier MS
特洛克斯勒衰落是一种复杂的视觉现象，其机制尚不明确。本研究旨在验证纹外通路中小细胞和大细胞加工对转铁蛋白的贡献的假设。这项研究使用低频率、重复的经颅磁刺激(RTMS)，在顶叶、颞叶和额叶背外侧皮质的目标部位进行，以改变在TF范式和对小细胞和大细胞处理敏感的测试中的表现。9名右撇子健康受试者在基线时完成了三项任务，即TF、纹理检测(TD)和运动检测(MD)，并分别在每个皮质部位进行了15分钟的低频rTMS。结果显示rTMS对每项测试的偏侧化效应。左侧颞叶刺激使小细胞TD任务减慢，并加速了Tf。右侧顶叶刺激可明显加速Tf，而左侧顶叶刺激可使Tf减慢。右额叶刺激加速了大细胞MD任务的执行。综上所述，在其他研究的背景下，这些发现表明，对于Tf以及对于小细胞和大细胞的处理任务，大脑半球都是特化的。
Troxler Fading (TF) is a complex visual phenomenon with uncertain mechanisms. This study was performed to test hypotheses concerning the contributions of parvocellular and magnocelluar processing in extrastriate pathways to TF. The study used low-frequency, repetitive Transcranial Magnetic Stimulation (rTMS) delivered at target sites in the parietal, temporal and dorsolateral frontal cortex to alter performance on a TF paradigm and on tests sensitive to parvocellular and magnocellular processing. Nine, right-handed, healthy subjects completed 3 tasks, TF, Texture Detection (TD), and Motion Detection (MD), at baseline and after undergoing 15 minutes of low-frequency rTMS at each cortical site on separate occasions. Results revealed lateralized effects of rTMS on each test. Left temporal stimulation slowed the parvocellular, TD task and it accelerated TF. Right parietal stimulation markedly accelerated TF whereas left parietal stimulation slowed TF. Right frontal stimulation accelerated performance on the magnocellular, MD task. Taken together and in the context of other research studies, the findings suggest hemispheric specialization both for TF and for the parvocellular and magnocellular processing tasks.