Ultradian rhythms are bodily rhythms that last less than 24 hours. The most obvious ultradian rhythm is the different stages of sleep, existing within the ciradian rhythm of the sleep-wake cycle. Sleep is dived into cycles, each lasting about 90

Methods of studying cortical specialisation are divided into two groups: the invasive, and the non-invasive. The invasive methods are those, in which something is injected into the brain, to find out what the problem is. The non-invasive methods are more

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