Habitual lying that often serves no clear purpose and may be linked to personality disorders like narcissism or psychopathy.
Dishonesty exists on a spectrum, from minor social lubricants to life-altering frauds: dishonesty
Functional MRI scans show that lying increases activity in the prefrontal cortex—the area responsible for decision-making and problem-solving—meaning it is more taxing than telling the truth. Habitual lying that often serves no clear purpose