Next time a es to your office, offer him a cup of coffee . And when you ’ re doing your holiday shopping online, make sure you ’ re holding a large glass of iced tea . The physical sensation (感觉) of warmth encourages emotional warmth, while a cold drink in hand prevents you from making unwise decisions — those are the practical lesson being drawn from recent research by psychologist John A. Bargh . Psychologists have known that one person ’s perception ( 感知) of another ’s“ warmth ” isa powerful determiner in social relationships . Judging someone to be either “ warm ” or “ cold ” isa primary consideration, even beating evidence that a“ cold ” person may be more capable . Much of this is rooted in very early childhood experiences, Bargh argues, when babies ’ conceptual sense of the world around them is shaped by physical sensations, particularly warmth and coldness . Classic studies by Harry Harlow, published in 1958, showed monkeys preferred to stay close toa cloth “ mother ” rather than one made of wire, even when the wire “ mother ” carried a food bottle . Harlow ’s work and later studies have led psychologists to stress the need for warm physical contact from caregivers to help young children grow into healthy adults with normal social skills . Feelings of“ warmth ” and “ coldness ” in social judgments appear to be universal . Although no worldwide study has been done, Bargh