Which disorder has been linked to an excess activity of dopamine neurotransmitter?

Schizophrenia

The correct answer is Option (4) → Schizophrenia

Biological researchers have found that psychological disorders are often related to problems in the transmission of messages from one neuron to another. A tiny space called synapse separates one neuron from the next, and the message must move across that space. When an electrical impulse reaches a neuron’s ending, the nerve ending is stimulated to release a chemical, called a neuro-transmitter. Studies indicate that abnormal activity by certain neuro-transmitters can lead to specific psychological disorders. Anxiety disorders have been linked to low activity of the neurotransmitter gamma aminobutyric acid (GABA), schizophrenia to excess activity of dopamine, and depression to low activity of serotonin.