The textbook "Speed of Human Information Processing in Psychiatric Disorders" by George Tsourtos offers a comprehensive analysis of information processing speed in mental disorders. It specifically examines reaction time and its limitations due to various speed-accuracy strategies. In contrast, inspection time is considered a more reliable indicator of early information processing, as it is not influenced by these strategies. The study shows that participants with psychiatric diagnoses exhibit significantly longer inspection times than healthy control groups, indicating slowed information processing. Particularly, unmedicated patients, who are believed to be most affected by reduced neurotransmitter activity, show the longest inspection times. These findings are crucial for better understanding the cognitive processes behind psychiatric disorders and illuminating the effects of treatments such as electroconvulsive therapy.