Final answer:
This is about the relationship between varicella and Alice In Wonderland Syndrome (AIWS) and how a researcher investigated it using a control group and cases.
Step-by-step explanation:
The researcher wanted to investigate the relationship between varicella (chickenpox) and Alice In Wonderland Syndrome (AIWS), a neurological condition. They recruited participants aged 9 to 18 years old for their study. To investigate the relationship, the researcher selected 63 cases from a global registry and matched them with controls at a 1:2 ratio. Out of the participants, 20 were exposed to varicella, while 113 controls had never been exposed. This study falls under the field of Biology as it involves investigating the relationship between a virus (varicella-zoster virus) and a neurological condition.