---
title: "IQ Score | Abnormal Psychology"
description: "IQ score is a standardized measure of cognitive ability in Abnormal Psychology, used with adaptive functioning to identify intellectual developmental disorder."
canonical: "https://fiveable.me/abnormal-psychology/key-terms/iq-score"
type: "key-term"
subject: "Abnormal Psychology"
unit: "Unit 14"
---

# IQ Score | Abnormal Psychology

## Definition

An IQ score is a standardized number that compares a person's cognitive performance to a norm group. In Abnormal Psychology, it is used with adaptive functioning to help evaluate intellectual developmental disorder.

## What It Is

An IQ score in Abnormal Psychology is a standardized measure of intellectual performance, usually compared with a norm group rather than judged in isolation. It gives a snapshot of reasoning, problem-solving, verbal understanding, and other cognitive skills on a test designed to compare people of the same age.

The average score is set at 100, and scores are spread out around that average. That matters because an IQ score is not just a raw count of right answers. It is converted using a standard scoring system, so the number tells you how far a person's performance is from the average group result.

This term shows up most clearly in the study of intellectual developmental disorder. A very low IQ score, often below 70, can be one sign of the disorder, but it is not enough by itself. The diagnosis also depends on adaptive functioning, which means how well the person manages everyday tasks, communication, self-care, and social responsibility in real life.

That distinction is a big deal in abnormal psychology. Someone can have a low test score and still function fairly well with support, or someone can have an average score and still struggle with everyday judgment because of another condition. So the IQ score is one piece of the picture, not the whole diagnosis.

IQ tests also have limits. They can be affected by language background, schooling, test familiarity, and cultural context. In abnormal psychology, that means you treat the score as one clinical clue, not a final verdict on ability, potential, or worth. A good interpretation asks what the number means in context, not just what the number is.

## Why It Matters

IQ score matters in Abnormal Psychology because it is one of the main ways professionals talk about intellectual functioning in a structured, measurable way. When you are looking at intellectual developmental disorder, the score helps show whether a person's cognitive functioning is significantly below what is expected for their age.

But the term matters just as much for what it does not do. A score alone does not tell you whether someone can live independently, communicate needs, follow routines, or manage school and work demands. That is why the course pairs IQ score with adaptive functioning instead of treating intelligence as a single number.

It also helps you spot common misconceptions. People often use IQ as if it measures a person's total potential, but abnormal psychology treats it more carefully. The field is interested in diagnosis, support needs, and real-world functioning, not ranking people as smart or not smart.

In case analysis, an IQ score can point you toward intellectual developmental disorder, but only if the rest of the clinical picture fits too. That makes it a useful bridge between testing, diagnosis, and support planning.

## Connections

### [Adaptive Functioning](/abnormal-psychology/key-terms/adaptive-functioning)

IQ score is only half of the diagnosis story in intellectual developmental disorder. Adaptive functioning looks at everyday skills like communication, self-care, school performance, and social judgment. A person can have a low IQ score and still need different support depending on how they manage daily life, so the two concepts are interpreted together.

### Diagnostic Criteria

In Abnormal Psychology, IQ score becomes meaningful when you place it inside diagnostic criteria. A cutoff like below 70 can suggest intellectual developmental disorder, but the diagnosis also requires evidence of impaired adaptive functioning and onset during the developmental period. The number helps, but the criteria decide.

### [Stanford-Binet Test](/abnormal-psychology/key-terms/stanford-binet-test)

The Stanford-Binet Test is one of the classic intelligence tests used to generate an IQ score. It measures several cognitive areas, not just memorization or school knowledge. If a question asks where the score comes from, this test is a common example of the kind of standardized assessment behind it.

### [Wechsler Intelligence Scale](/abnormal-psychology/key-terms/wechsler-intelligence-scale)

The Wechsler Intelligence Scale is another major source of IQ scores in psychological assessment. It is often used because it gives a fuller picture of cognitive strengths and weaknesses across different subtests. In abnormal psychology, that helps clinicians think beyond one total score and look at patterns in performance.

## On the AP Exam

A case analysis may give you a test score, daily functioning details, and a few behavior clues, then ask whether intellectual developmental disorder is likely. That is where IQ score comes in, but you should not stop at the number. Use it with adaptive functioning and the rest of the symptoms to decide whether the profile fits the diagnosis.

You may also be asked to interpret a score in context. A score around 100 means average performance compared with the norm group, while a score below 70 raises concern only if the person's everyday functioning is also impaired. On quizzes and short answers, you may need to explain why the same IQ score can mean very different things depending on language background, education, or access to testing.

## Key Takeaways

- An IQ score is a standardized measure of cognitive performance compared with a norm group, not a raw measure of a person's value or potential.
- In Abnormal Psychology, the score is most often used when discussing intellectual developmental disorder.
- A low IQ score alone does not make a diagnosis, because adaptive functioning has to be considered too.
- Scores can be influenced by language, schooling, and culture, so interpretation has to stay cautious.
- The best way to use an IQ score is as one clue in a larger clinical picture.

## FAQs

### What is IQ score in Abnormal Psychology?

An IQ score is a standardized number that compares a person's cognitive performance with a norm group. In Abnormal Psychology, it is used to evaluate intellectual functioning, especially when looking at intellectual developmental disorder. The score is useful, but it is not a complete measure of intelligence.

### Does a low IQ score mean intellectual developmental disorder?

Not by itself. A score below 70 is often a warning sign, but the diagnosis also requires deficits in adaptive functioning. That means you have to look at everyday skills, not just test performance.

### How is IQ score different from adaptive functioning?

IQ score measures cognitive performance on a standardized test, while adaptive functioning looks at how a person handles real-world tasks like communication, self-care, and social responsibility. Abnormal Psychology uses both because a person can score low on a test but still manage daily life differently than another person with the same score.

### What test gives an IQ score?

Common examples include the Stanford-Binet Test and the Wechsler Intelligence Scale. These tests use standardized scoring so the result can be compared with a norm group. Different tests may emphasize different cognitive skills, which is why the interpretation matters.

## Related Study Guides

- [14.3 Intellectual Developmental Disorder](/abnormal-psychology/unit-14/intellectual-developmental-disorder/study-guide/UfrOsV3GlxgMqQIF)

## About This Document

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