One potential biological explanation for the fact that extraverts tend to seek out more sensory stimulation is that: they are operating at an optimal level of arousal at baseline. their baseline arousal is high, and so they always seek to reduce it. their level of arousal fluctuates all the time their baseline arousal is low, and so they always seek to increase it. Question 17 The main distinction between simply feeling sad and true psychopathology (e.g., depression) is that: psychopathology is based on genetic traits that we inherit psychopathology must be diagnosed by a clinician psychopathology is long-lasting psychopathology reduces our ability to function in our lives