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首页> 外文期刊>The European Journal of Neuroscience >Taste laterality in the split brain.
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Taste laterality in the split brain.

机译：大脑裂开时的口味偏向。

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摘要

Two patients with corpus callosum resection, one complete and the other sparing the genu and the rostrum, were tested for discrimination of three basic taste stimuli (sour, bitter, salty) applied to the right or left sides of the tongue. Responses were made by pointing with either hand to written words or images of visual objects corresponding to the stimuli, a language-based discrimination. In both patients, response accuracy was significantly above chance for both hemitongues but there was a significant advantage for the left side. Reaction time was shorter for left stimuli than for right stimuli but the difference was not significant. Eight normal controls matched for age with the patients performed equally well with right and left hemitongue stimuli and so did a third callosotomy patient with sparing of the posterior callosum, including the splenium. Tactile and visual tests showed that the left hemisphere was responsible for language-based responses in the first two patients. The results confirm and extend previous findings in another callosotomy patient, indicating that: (i) taste information from either side of the tongue can reach the left hemisphere in the absence of the corpus callosum; (ii) the ipsilateral input from the tongue to the left hemisphere is more potent functionally than the contralateral input and (iii) in the normal brain, the corpus callosum, specifically its posterior part including the splenium, appears to equalize the effects of the ipsilateral and contralateral gustatory inputs on the left hemisphere. Taken together with evidence about lateralized taste deficits following unilateral cortical lesions, the results also suggest that the gustatory pathways from tongue to cortex are bilaterally-distributed with an ipsilateral predominance that may be subject to individual variations.
机译：测试了两名切除call体的患者，其中一名完整，另一名保留膝和讲台，以区别于施加在舌头右侧或左侧的三种基本味觉刺激（酸，苦，咸）。通过用手指指向与刺激相对应的文字或视觉对象的图像（基于语言的辨别力）来做出响应。在这两个患者中，两个半身像的应答准确度均显着高于机会，但左侧有明显的优势。左刺激的反应时间短于右刺激，但差异不显着。八名与年龄相匹配的正常对照患者在左右侧半球刺激方面的表现均相同，第三名切小肠切开术患者的后部call骨（包括脾脏）也表现良好。触觉和视觉测试表明，左半球负责前两名患者的基于语言的反应。该结果证实并扩展了另一例骨切开术患者的先前发现，表明：（i）在没有call骨call的情况下，舌头两侧的味觉信息可以到达左半球; （ii）从舌头到左半球的同侧输入比对侧输入更有效，并且（iii）在正常大脑中，call体，特别是其后部，包括脾脏，似乎可以均衡同侧的效果左半球的对侧味觉输入。结合单侧皮质病变后味觉偏侧化的证据，结果还表明，从舌头到皮层的味觉通路是双向分布的，同侧优势可能会因个体差异而异。

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