The role of the cerebellum in the chemical senses is still poorly understood. This voxel-based morphometry (VBM) study investigated associations between gray matter volume (GMV) in subregions of the cerebellum and olfactory performance. VBM data from 48 men were analyzed. The participants were tested with a standardized olfactory test that measured olfactory threshold, discrimination, and identification ability. The investigated sample covered a wide range of olfactory performance, including individuals with a reduced sense of smell (anosmia and hyposmia) and normosmia. The computed regression analyses revealed a positive association between olfactory identification performance and GMV in lobule VI. This cerebellar subregion is involved in higher-order cognitive functions (language and memory), which are necessary prerequisites for correct odor labeling. Odor detection and discrimination were unrelated to cerebellar GMV.

中文翻译：

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小脑灰质和嗅觉表现。

小脑在化学意义上的作用仍然知之甚少。这项基于体素的形态计量学（VBM）研究调查了小脑子区域灰质体积（GMV）与嗅觉表现之间的关联。分析了来自48名男性的VBM数据。用标准的嗅觉测试对参与者进行测试，该嗅觉测试测量了嗅觉阈值，辨别力和识别能力。被调查的样本涵盖了广泛的嗅觉表现，包括嗅觉降低（失眠和低渗）和正常睡眠的个体。计算的回归分析表明，小叶VI中嗅觉识别性能和GMV之间呈正相关。这个小脑子区域参与了更高阶的认知功能（语言和记忆），这是正确标记气味的必要先决条件。气味的检测和辨别与小脑GMV无关。