According to Melinda Walker, RN, from Johns Hopkins Hospital, which of the following describes the primary mechanism by which Electroconvulsive Therapy (ECT) affects the brain?

Choice A reason: While ECT does increase cerebral blood flow, this is not the primary mechanism of its therapeutic effect. Choice B reason: ECT induces a controlled seizure that alters neurotransmitter levels and receptor sensitivity, leading to improved mood regulation. It also promotes neurogenesis and synaptic plasticity, which are critical in alleviating symptoms of major depressive disorder. This is the correct mechanism. Choice C reason: ECT does not directly stimulate the hypothalamic gland to release dopamine. This is not supported by scientific evidence. Choice D reason: ECT does not suppress electrical activity; rather, it induces controlled electrical activity (a seizure) to achieve therapeutic effects.