There is research evidence which supports the cognitive explanation of depression. Boury et al. (2001) found that patients with depression were more likely to misinterpret information negatively (cognitive bias) and feel hopeless about their future (cognitive triad). Further to this, Bates et al. (1999) gave depressed patients negative automatic though statements to read and found that their symptoms became worse. These findings support different components of Beck’s theory and the idea that negative thinking is involved in depression.