One of the functions of BIS proposed by Gray (2004) is related to the error-triggering mechanism. Individual differences in the sensitivity of the BIS are expected to determine the threshold for this error-triggering mechanism (Corr, 2010). It is assumed that discrimination is a basic cognitive process improving the ability to detect discrepancies between expected and actual stimuli. Therefore it is hypothesized that high BIS sensitivity is related to better discrimination abilities. In two studies the ability to discrimination was tested by using the d2 Test of Attention (study 1) and modified version of local–global processing test (study 2). In both studies the performance between similarity detection and difference detection conditions were compared. Using the BIS/BAS scale assessed the BIS sensitivity. Results confirmed the better discrimination abilities in high BIS sensitive subjects, which can be seen as a cognitive tool to fulfill the control function by the BIS.