"At <a href=""https://www.youtube.com/watch?v=hppbxV9C63g&amp;t=35m45s"">35:45</a>", it is mentioned that g does not increase when you go from being sick/nervous to being healthy/calm.<br><br>But IQ also depends on conditions. And if you're sick, your IQ might simply be lower than when you're healthy. In that case, you would have 2 IQ scores: one when sick, one when healthy.<br><br>And of course, assuming you are healthy most of the time, the test when healthy is most indicative of intellectual performance.