Limitations
There are a number of limitations of this study. While all bipolar patients assessed in this study were characterized as euthymic at the time of testing, persistence of residual sub-threshold symptoms of both polarities may have affected performance. Moreover, all patients were under psychotropic medications, which could have influenced their performance at the time of testing. Finally, a larger sample including groups of different BD subtypes is required. All our participants were diagnosed with for bipolar I disorder. This has to be kept in mind because results can be generalized only with regard to this proportion that is not representative of the disorder as a whole. There is reason to believe that different subtypes of BD, may differ in eye-gaze processing because they have been found to differ along important cognitive functions such as verbal memory, attention, and executive functions [57, 58].