Over the years, measuring the intelligence of cats has been a topic of interest for many researchers. The concept of measuring the IQ of cats was first introduced in the early 1900s, when intelligence tests were being developed for humans. It was not until the mid-20th century, however, that formal intelligence tests for cats were first developed.
One of the earliest attempts at measuring cat intelligence was conducted by Dr. Jeanne Robinson of the University of Illinois in the 1950s. She developed a test called the "Kitty IQ Test", which consisted of a series of tasks that measured a cat's ability to solve problems and adapt to new situations. The test was widely publicized and received lots of media attention at the time.
In the 1960s and 1970s, researchers at the University of Pennsylvania and the University of California, Berkeley, developed more sophisticated tests for measuring cat intelligence. These tests included tasks such as maze navigation, object discrimination and problem-solving.

The validity and reliability of these tests have been questioned by some researchers as cats may not always be motivated to participate in testing situations and may not perform consistently across different contexts. Additionally, there is debate over what exactly constitutes "intelligence" in cats and whether traditional measures of intelligence developed for humans are appropriate for measuring the cognitive abilities of cats.
Despite the all above mentioned challenges, interest in measuring cat intelligence has continued, and more recent studies have used a variety of methods to assess cats' cognitive abilities. For example, a study published in the journal Animal Cognition in 2017 used a touch screen task to measure cats' ability to distinguish between visual stimuli.