Alicia is being tickled by her older sister. which divisions of the nervous system are receiving the signals from her sister’s fingers?

The correct answer is central nervous system and peripheral nervous system.

Explanation:

The sensation of tickle stimulates the nerve terminals, the touch receptors in the skin are the constituents of the PNS. The sensation information is then transmitted via the nerve fibers to the CNS, the brain, and the spinal cord.  

The assessment of information is then done in the somatosensory area of the brain, that is, in the cingulate cortex and the cerebral cortex. Thus, both the divisions of the nervous system, that is, the CNS and the PNS takes part in the process of tickling sensation.