Answer:
after it happens
Step-by-step explanation:
A reflex action or reflex pathway is the pathway that gets activated in the condition or reflex or immediate situations.
During reflex action, the sensory signals are not sent initially to the brain which helps in analyzing the situation but the analysis and interpretation of signals are performed by the spinal cord (a part of CNS) interneurons.
After the motor signals are sent to the effector's muscles, the sensory signals from the spinal cord are then sent to the brain. Therefore, the role of the brain comes later and the brain then analyses that what happened during the reflex action.
Thus, after it happens is the correct answer.