Final answer:
The least often used biomedical intervention for psychological disorders is deep-brain stimulation (DBS) due to its invasive nature and the necessity for surgical expertise. More commonly used treatments include medications and psychotherapy which are less invasive and have broader applications for various symptoms and disorders.
Step-by-step explanation:
The biomedical intervention used least often for eliminating the symptoms of psychological disorders is likely deep-brain stimulation (DBS).
DBS is an invasive surgical procedure that involves implanting electrodes in specific areas of the brain. It is typically reserved for severe cases of mental health disorders that have not responded to other treatments such as medications or psychotherapy. This intervention is less commonly used due to its invasive nature, the risk of side effects, and the need for surgical expertise.
On the other hand, medications such as antidepressants, anxiolytics, stimulants, and antipsychotics are more frequently used because they are less invasive and can be effective for a broader range of symptoms and disorders.
Other biomedical interventions include blood pressure medications, classes of antipsychotics, psychotherapy, electroconvulsive therapy, and selective serotonin reuptake inhibitors, which are more commonly applied due to their non-invasive nature and extensive evidence supporting their efficacy. The choice of treatment depends on various factors including the specific disorder, severity of symptoms, and patient's preference, with a trend towards using the least invasive options first.