When referring to performance, "better" means achieving a higher level of efficiency, accuracy, or quality in completing tasks.
Related terms
Optimal Performance: This refers to reaching the highest level of efficiency or effectiveness in performing a task.
Arousal Theory: According to this theory, our performance is influenced by our level of physiological or psychological arousal.
Yerkes-Dodson Law: This law states that there is an optimal level of arousal for each individual task; performance improves with increased arousal up to a certain point but then declines as arousal continues to increase beyond that point.