A question might read: “In what way are Harry Potter and Bugs Bunny alike?” In this subtest, the chatbot’s tendency to give very detailed, show-offy answers started to irritate me and the “stop generating response” button of the test software interface turned out to be useful. A typical question might be: “What is the capital of Ukraine?” The Similarities subtest measures abstract reasoning and concept formation skills. The Information subtest is a test of general knowledge and reflects intellectual curiosity, level of education and ability to learn and remember facts. The chatbot also performed well on the Similarities and Information subtests, reaching the maximum attainable scores.
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ChatGPT’s answers received the full two points. In scoring, one point would be given for a thing like my phone in defining a gadget and two points for the more detailed: a small device or tool for a specific task. This subtest measures word knowledge and verbal concept formation, and a typical instruction might read: “Tell me what ‘gadget’ means.”ĬhatGPT aced it, giving answers that were often highly detailed and comprehensive in scope and which exceeded the criteria for correct answers indicated in the test manual. I started the testing process with the Vocabulary subtest as I expected it to be easy for the chatbot, which is trained on vast amounts of online texts.
A sixth subtest of the Verbal IQ scale is Digit Span, which measures short-term memory, and cannot be administered to the chatbot, given its lack of the relevant neural circuitry that briefly stores information like a name or number.
It was possible to test ChatGPT because five of the subtests on the Verbal IQ scale-Vocabulary, Similarities, Comprehension, Information and Arithmetic-can be presented in written form. The mean IQ is set at 100 points, and the standard deviation of the points on the testing scale is 15, meaning that the smartest 10 percent and 1 percent of the population have IQs of 120 and 133, respectively. The global Full Scale IQ measure is based on scores from all 11 subtests. I used the third edition of the WAIS that consists of six verbal and five nonverbal subtests that make up the Verbal IQ and Performance IQ components, respectively. The test in question is the most commonly used IQ test, the Wechsler adult intelligence scale (WAIS). Without need for any preparation-no verbal introductions necessary for the testing protocol-I copied the exact questions from the test and presented them to the chatbot in the computer. Nor did it express uninvited, skeptical comments about intelligence tests and testers like myself. It doesn’t show test anxiety, poor concentration or lack of effort. ChatGPT was almost an ideal test taker, with a commendable test-taking attitude. My first impressions were quite favorable. Knowing all this made me curious to see how smart ChatGPT is by human standards, and I set about to test the chatbot. It writes academic essays and fairy tales, tells jokes, explains scientific concepts and composes and debugs computer code. So I was immediately intrigued after reading the many recent articles describing ChatGPT as having impressive humanlike skills. In my work as a clinical psychologist, I assess the cognitive skills of human patients using standardized intelligence tests. ChatGPT is the first nonhuman subject I have ever tested.
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