Recognising IDD involves looking at both how someone thinks and learns, and how they manage everyday life. It’s like putting together a puzzle – you need all the pieces to see the complete picture.
The Thinking Side: Cognitive Testing
What Gets Measured? Psychologists use standardised IQ tests to measure four main areas:
Verbal Abilities
- Understanding spoken language
- Expressing thoughts and ideas clearly
- Using words to explain concepts
- Following verbal instructions
Visual Abilities
- Understanding visual information and patterns
- Organising visual-spatial information
- Recognising relationships between objects
Attention and Working Memory
- Concentrating on tasks
- Holding information in mind while working with it
- Following multi-step directions
Processing Speed
- How quickly and accurately someone can complete tasks
- Time needed to understand and respond to information
The Numbers Game: IQ Scores
In Australia, an IQ score below 70 (two standard deviations below the average) typically meets the first criterion for IDD, although some flexibility is allowed to account for measurement error.
To put this in perspective:
- Average IQ range: 85-115
- Most people (about 68%) score between 85-115
- Only about 2.5% of people score below 70
But Here’s the Important Bit: IQ scores are just one piece of the puzzle. They don’t tell us about someone’s personality, kindness, creativity, determination, or many other valuable qualities.
Important Testing Considerations
It’s Just a Snapshot IQ tests capture performance on one particular day. Factors like:
- Being tired or unwell
- Feeling anxious or stressed
- Language barriers
- Cultural differences
- Physical limitations
- Lack of motivation
…can all affect results.
Cultural Sensitivity Matters Traditional IQ tests may not be culturally appropriate for all Australians, particularly First Nations peoples or even refugees. The tests might underestimate abilities or not reflect different ways of learning and knowing.
Physical Considerations Some tests require physical abilities (like drawing or manipulating objects) that might not be possible for people with physical disabilities, potentially affecting their scores unfairly. Psychologists take this into consideration when testing.
Final thoughts
Recognising and understanding IDD is a nuanced journey, but you don’t have to navigate it alone. If you or someone you care about could benefit from a comprehensive assessment, our experienced team at Psychological Assessments is here to provide clarity and support—reach out today to book an appointment.
