N Power does not correlate with questionnaire measures of dominance or power, and n Power is more efficacious than self-reported dominance motivation in predicting dominance behavior (King, 1995; McClelland, 1987; McClelland et al., 1989; Schultheiss, 2001; Schultheiss, 2007; Schultheiss & Pang, 2007; Winter, 1973). Next, we will describe how hormone levels change as an interactive function of dominance situations and individuals’ n Power. After introducing n Power and explaining how it is measured, we will discuss the biological underpinnings of n Power and dominance behavior with a focus on their relationships with the steroid hormone testosterone. Everyone hits periods of low drive, even when hormone levels are in a healthier place. It’s deeply rooted in the brain, and testosterone may play a role in the systems that regulate goal-seeking behavior, reward anticipation, and stress resilience. And for many men, that daily motivation to push through fatigue, focus on long-term goals, and stick to healthy habits becomes harder to access as hormone levels drop. Agnathans (jawless vertebrates) such as lampreys do not produce testosterone but instead use androstenedione as a male sex hormone. Thus, after losing a dominance contest, decreases in testosterone make it less likely one will expend more energy on the costly pursuit of power. Conversely, decreases in testosterone as a function of losing make one less motivated to engage in another dominance contest and do not reinforce antecedent behaviors. Testosterone increases promote the engagement in another dominance contest and lower one’s threshold for aggressive engagement, a conclusion that is supported by both animal and human studies (Archer, 2006; Mazur, 1985). As a result, you may also find depression to be a symptom of low testosterone because that carnal need for accomplishment is not being satisfied. When your testosterone drops, you can count on your overall zest for life to drop along with it. However, is often one of the top listed symptoms you’ll see if you search for symptoms of low testosterone. Testosterone and motivation are so connected that lack of motivation. Do you find that you’re waking up without the same energy and drive you used to have? The presence of these ubiquitous steroids in a wide range of animals suggest that sex hormones have an ancient evolutionary history. Like other androsteroids, testosterone is manufactured industrially from microbial fermentation of plant cholesterol (e.g., from soybean oil). This also made it obvious that additional modifications on the synthesized testosterone could be made, i.e., esterification and alkylation. Strength training, healthy fats, and quality sleep all help maintain optimal testosterone levels. Researchers found that when testosterone levels are low, cortisol takes over, leading to increased stress responses and a decreased ability to handle life's challenges. Such work could help further uncover how the brain orchestrates the complex hormonal responses to dominance challenges and stressors in the context of implicit power motivation. Documenting such behavioral mediation by estradiol in women would make estradiol a more complete parallel to testosterone in men, since testosterone changes mediate such behaviors in men (Schultheiss & Rhode, 2002; Schultheiss et al., 2005). Further, if estradiol changes also mediate behaviors that are instrumental to the outcome of a dominance contest, that would suggest that estradiol change is not only a response to the situation, but is also critically linked to the shaping of the behaviors are instrumental to the contest outcome.