即使是简单的视觉提示，如盘子大小和灯光，也会影响食物的份量和消耗量。

Even simple visual cues, like plate size and lighting, have been shown to affect portion size and consumption.

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因此科学家们向实验对象展现了多种的视觉错觉，比如，两个经常被认为大小不同的事实上相等的圆。

So scientists presented various visual illusions to subjects, like one where two equal circles are often perceived as being different sizes.

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研究人可通过功能磁共振成像（FMRI）来测量每个志愿者脑部的初级视觉表皮层大小。

Using functional magnetic resonance imaging (fMRI), the researchers were also able to measure the surface area of the primary visual cortex in each volunteer.

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