IQ Scores in Children and Psychotic Disorders

Researchers in London and the United States have recently found that individuals who have a psychotic disorder in their life have had a decrease in both their IQ as well as a decrease in a number of other cognitive abilities. This study, which was published in JAMA Psychiatry, tracks individuals who develop some sort of psychotic disorder in their life. The researchers studied 4332 individuals who were between the age of 18 months to 20 years old and resided in the United Kingdom.

The results they found suggested that individuals who developed a psychotic disorder later in their life had an IQ score that was 15 points lower than the average individual. The research found that their IQ began to drop around the age of four and continued throughout their childhood and teenage years. In addition to having a lower IQ score, the researchers found the individuals with psychotic disorders had poorer cognitive abilities such as working memory, attention, and processing speed. The study suggests that individuals with psychotic disorders do not have their mental abilities deteriorate over time, but rather never fully develop them or develop the abilities at a slower rate than individuals without psychotic disorders.

This study is helpful to show the process and timeline of how psychotic disorders develop. The area of mental health is still an area that needs more research. This study helps provide information about what is happening to the brain of an individual who has schizophrenia for example. This study had researchers from both the King’s College London’s Institute of Psychiatry, Psychology & Neuroscience and the Icahn School of Medicine at Mount Sinai in the United States working on it.

The part of the article I found was the most interesting, was the fact that psychotic individual’s mental abilities do not deteriorate over time, but rather never fully develop or develop at a slower rate than healthy individuals. This study suggests that there may be a way to lessen or prevent psychotic disorders from developing if there is early intervention in the individual. This gives hope to the possibility that science is coming closer to preventing psychotic disorders from occurring in individuals, which in turn makes the world a healthier place. There is obviously more research that needs to be done, but this was a step in the right direction.



King’s College London. (2018, January 31). Falling IQ scores in childhood may signal psychotic disorders in later life. ScienceDaily. Retrieved February 1, 2018 from

1 thought on “IQ Scores in Children and Psychotic Disorders

  1. scolon

    This is really interesting, so if a person has a psychotic disorder their IQ is 15 points lower than the average beginning to drop at the age of four. Does this mean though in their childhood and teenage years their IQ’s will drop even further and then stop dropping at some point then just stay at that point for the remainder of their lives? Also I wonder if the medications taken for the psychotic disorders can help their IQ’s in any way. If they do have an early intervention of the psychotic disorders early on would those people have normal IQ’s just like every one else as adults? I’ll have to check out that link because this was super fun to learn about! Good post!

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