Association Studies in Mental Illness is written by Grace Helen Kent and Aaron Joshua Rozanoff. In this work, they explore the relationship between associations and mental disorders, presenting the results of their observations and conclusions. The authors examine the phenomena and regularities observed in thinking and associations in people suffering from mental disorders. Their research opens up new horizons in the understanding of the nature of these disorders and can be useful for specialists in the field of psychiatry and psychology, as well as for everyone who is interested in issues of the human psyche.