Bilateral lesions of the suprachiasmatic nuclei (specific brain region) selectively disrupt circadian cycles.
The suprachiasmatic nucleus (SCN) is a bilateral structure located in the anterior part of the hypothalamus. It is the central pacemaker of the circadian timing system and regulates most circadian rhythms in the body.
In the brain, a small group of hypothalamic nerve cells, the suprachiasmatic nucleus (SCN), functions as a master circadian pacemaker controlling the timing of the sleep-wake cycle and coordinating this with circadian rhythms in other brain areas and other tissues to enhance behavioral adaptation. The suprachiasmatic nucleus (SCN), the master circadian clock of mammals, is composed of multiple circadian oscillator neurons.
To learn more about suprachiasmatic nucleus , here
https://brainly.com/question/14755066
#SPJ4