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In your dreams, you mayclearly see something or hear someone talking. But what about smells? Can youever remember smells from your dreams?
A study published in 1896looked at different sensory (感官的) experiences in dreams. Itfound visual (视觉的) experience1 controls one's dreams. It takes up about 85%,while auditory (听觉的) makes up 69%, and smellonly 7%.
But why? Now scientistshave possible reasons based on what is known about the brain.
In our brain, there is aspecial part called the cerebral cortex (大脑皮层). It is linked to ourfeelings. As much as two-thirds of the cerebral cortex works in vision (视力). So vision
2 often in dreams. Auditory is closely tied tolanguage, and language is processed entirely in the cerebral cortex. Smell,3, has little to do with thecerebral cortex. It connects directly into the memory and emotional systems.That's why a smell can bring back a memory.
Another4 is that perhaps smell is not easily affected (影响) by our imagination. For example, close your eyes and imagineyour favorite dish. What do you get? It is easy to think about what it lookslike. But it is not as easy to imagine its smell.
Vision and auditory is acomplex (复杂的) process inside the brain.But smell is a direct measurement (衡量) of the chemicals in theair. There is5 imagination involved in smell. Therefore,smell might not be much affected by the brain activity during dreaming.
It is6 to taste and touch. That is why you don'toften have the experience of taste and touch in your dreams.
