Tanae was drowsy, but when she heard her child call out, she felt immediately wide awake and alert. A part of her brain that plays a crucial role in her arousal level and attention is the:

reticular formation

Explanation:

Reticular formation -

It refers combination of various interconnected nuclei which is present in the brainstem, is referred to as reticular formation .

The main function of the reticular formation is -

sleep and consciousness , as the reticular formation has the control over the sensory signals , hence it plays a pivot role in the sleep and alertness .

Hence , from the given scenario of the question ,

The correct answer is reticular formation .

answer; cultural trait;