Answer:
Lesion technique
Step-by-step explanation:
A lesion is a damage on a region of a tissue or organ.
The lesion method is a technique where a lesion or some damage is deliberately inflicted on the brain causing damage to the neurons.
The main intent being to know the specific function of a certain part of the brain.
These can be done surgically or chemically.
In our case, Kevin wants to know if the amygdala is needed for rats to learn to avoid an electric shock.
He injects a neurotoxin into the amygdala, this cause a lesion on the amygdala.
From these he can get to know the function of the amygdala.