---
title: "Lobotomy — AP Psychology Definition & Exam Guide"
description: "A lobotomy is a form of psychosurgery that destroyed brain tissue to treat mental illness, now obsolete after psychotropic drugs and ethics changed treatment."
canonical: "https://fiveable.me/ap-psych-revised/key-terms/lobotomy"
type: "key-term"
subject: "AP Psychology"
unit: "Unit 5"
---

# Lobotomy — AP Psychology Definition & Exam Guide

## Definition

A lobotomy is a form of psychosurgery, popular in the mid-20th century, that surgically severed or destroyed brain tissue (especially in the frontal lobes) to treat severe psychological disorders. It is rarely if ever performed today.

## What It Is

A **lobotomy** is a type of [psychosurgery](/ap-psych-revised/unit-5/5-treatment-of-psychological-disorders/study-guide/ZL6wEJsAunnbNYtj "fv-autolink"), meaning surgery that alters brain tissue to change behavior or treat a mental disorder. Doctors would cut or destroy connections in the [frontal lobes](/ap-psych-revised/key-terms/frontal-lobes "fv-autolink"), the part of your brain tied to planning, judgment, and emotion. The idea was that disrupting these circuits would calm severe symptoms like aggression or agitation.

In the CED, the lobotomy shows up under interventions derived from the biological perspective (5.5.F), alongside other invasive treatments like **electroconvulsive therapy (ECT)** and **transcranial magnetic stimulation (TMS)**. The big takeaway is that it's a historical cautionary tale. Psychosurgery (which may involve [lesioning](/ap-psych-revised/unit-1/4-the-brain/study-guide/zffu0vU5m7HwEMsU "fv-autolink"), the deliberate destruction of tissue) was used widely before we had good medications, and the lobotomy is the classic example of a treatment that did real harm. Think of it as the "before" picture in the story of how mental health treatment got more humane and evidence-based.

## Why It Matters

The lobotomy lives in **[Unit 5](/ap-psych-revised/unit-5 "fv-autolink"): Mental and Physical Health**, specifically topic 5.5 Treatment of Psychological Disorders, and supports learning objective [AP Psych Revised](/ap-psych-revised "fv-autolink") 5.5.F (biological interventions). It also anchors AP Psych Revised 5.5.A, which traces research and trends in treatment, because the decline of the lobotomy is a perfect example of how the field moved toward evidence-based interventions. Knowing the lobotomy lets you explain WHY treatment changed: once effective psychotropic medications arrived in the 1950s, crude surgery looked both unnecessary and unethical. That ties directly into the deinstitutionalization story, where hospitals and asylums released huge numbers of people once drugs made outpatient treatment possible.

## Connections

### Electroconvulsive Therapy and TMS (Unit 5)

All three are biological interventions, but they sit on a spectrum from brutal to precise. The lobotomy permanently destroyed tissue, ECT induces seizures but doesn't cut anything, and TMS is non-invasive magnetic stimulation aimed at specific circuits. The progression from lobotomy to TMS is basically the history of biological treatment getting safer and more targeted.

### Psychotropic Medication and Deinstitutionalization (Unit 5)

Antipsychotics and other [psychoactive medications](/ap-psych-revised/key-terms/psychotropic-medication "fv-autolink") are the reason lobotomies died out. Once a pill could manage symptoms, there was no justification for destroying brain tissue, and the same drugs let hospitals deinstitutionalize patients into community care.

### Nonmaleficence and APA Ethics (Unit 5)

The lobotomy is the textbook violation of [nonmaleficence](/ap-psych-revised/key-terms/nonmaleficence "fv-autolink"), the principle of "do no harm" (5.5.B). Many patients were left permanently impaired, which is exactly why modern psychologists are held to ethical standards like fidelity, integrity, and respect for people's dignity.

## On the AP Exam

On the MCQ, the lobotomy almost always appears in a history-of-treatment frame. Expect stems that ask you to identify Dr. Freeman's transorbital lobotomy of the 1940s, or to explain WHY lobotomies rapidly declined in the 1950s (the answer is the rise of effective antipsychotic medication). Other items contrast it with modern targeted treatments like TMS, asking you to recognize the evolution from invasive psychosurgery to non-invasive options. No released FRQ uses the term verbatim, but it's strong evidence in any free-response that asks you to describe trends in treatment or apply the ethical principle of nonmaleficence. What you need to DO: classify it as biological/psychosurgery, place it historically, and explain its decline.

## lobotomy vs electroconvulsive therapy (ECT)

Both are biological interventions for severe disorders, and both have a scary reputation, but they're not the same thing. A lobotomy is psychosurgery that permanently destroys brain tissue and is obsolete. ECT runs a brief electrical current through the brain to trigger a controlled seizure, doesn't cut tissue, and is still used today (especially for severe, treatment-resistant depression).

## Key Takeaways

- A lobotomy is a form of psychosurgery that severed or destroyed frontal lobe tissue to treat mental illness, and it's a biological intervention under topic 5.5 (objective 5.5.F).
- Lobotomies declined rapidly in the 1950s because effective antipsychotic medications made them unnecessary.
- The lobotomy is the classic violation of the ethical principle of nonmaleficence, do no harm.
- Dr. Freeman's transorbital lobotomy in the 1940s is a named historical detail that shows up in MCQ stems.
- Unlike the obsolete lobotomy, ECT and TMS are still used and represent the trend toward safer, more targeted biological treatment.

## FAQs

### What is a lobotomy in AP Psychology?

It's a form of psychosurgery that surgically cut or destroyed [brain](/ap-psych-revised/unit-1/2-overview-of-the-nervous-system/study-guide/4EFLv8T9ARX14r9M "fv-autolink") tissue, usually in the frontal lobes, to treat severe psychological disorders. In the CED it's listed as a biological/invasive intervention (5.5.F) and treated as a historical, now-obsolete procedure.

### Are lobotomies still performed today?

No. Lobotomies are rarely if ever performed now. They were largely abandoned in the 1950s once effective psychotropic medications became available and ethical concerns about the harm they caused became clear.

### How is a lobotomy different from electroconvulsive therapy (ECT)?

A lobotomy permanently destroys brain tissue and is obsolete, while ECT passes a brief electrical current to induce a controlled seizure without cutting anything and is still used today for severe depression. Both are biological treatments, but only one is still practiced.

### Why did lobotomies decline in use?

The main reason is the arrival of effective antipsychotic and other psychotropic medications in the 1950s, which managed symptoms without surgery. The drugs also enabled deinstitutionalization, moving patients out of hospitals and into community care.

### Is the lobotomy on the AP Psychology exam?

Yes, it can appear on the MCQ as part of topic 5.5, especially in questions about the history of treatment, Dr. Freeman's transorbital lobotomy, or why the procedure declined. Know it as a biological intervention and an example of a nonmaleficence violation.

## Related Study Guides

- [5.5 Treatment of Psychological Disorders](/ap-psych-revised/unit-5/5-treatment-of-psychological-disorders/study-guide/ZL6wEJsAunnbNYtj)

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