A positive Babinski response in an adult indicates what?

A positive Babinski response in an adult indicates an abnormal finding because, unlike in infants where it is considered normal due to the ongoing development of neural pathways, in adults it can signal dysfunction in the corticospinal tract. This reflex response occurs when the sole of the foot is stroked, and instead of curling downwards, the big toe extends upwards, often accompanied by fanning of the other toes.

In adults, a positive Babinski sign is an indication of neurological issues, such as lesions in the brain or spinal cord, and it can suggest various conditions including multiple sclerosis, ALS (amyotrophic lateral sclerosis), or other disorders affecting the central nervous system. The context of neurological health is important in interpreting this response, especially since the normal reflex in adults would be the downward curling of the toes.