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The first three terms of an arithmetic sequence are 9, 15, and 21. Find the term.
Electroconvulsive Therapy
A medical treatment involving the application of electric currents to the brain, intentionally triggering a brief seizure, used to treat severe mental disorders.
Severe Depression
A major depressive disorder characterized by extreme feelings of sadness, lack of interest in activities, and other symptoms that significantly impair daily functioning.
Neurotransmitters
Chemical messengers that transmit signals across the synaptic gaps between neurons.
Contingency Contract
A formal agreement between two parties where certain behaviors are linked with specific consequences or rewards.
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