List some human physiological or psychological factors that can influence human operator performance.

What will be an ideal response?

Variations in physical abilities and physical workplaces, diverse cognitive and perceptual abilities, personality types, and factors affecting perceptual and motor performance, such as:
Arousal and vigilance
Fatigue and sleep deprivation
Perceptual (mental) load
Knowledge of results and feedback
Monotony and boredom
Sensory deprivation
Nutrition and diet
Fear, anxiety, mood, and emotion
Stress
Drugs, smoking, and alcohol
Physiological rhythms