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Since emotions have to be programmed into robots from the outside, manufacturers may offer a menu of emotions carefully chosen on the basis of whether they are necessary, useful, or will increase bonding with the owner. In all likelihood, robots will be programmed to have only a few human emotions, depending on the situation. Perhaps the emotion most valued by the robot’s owner will be loyalty. One wants a robot that faithfully carries out its commands without complaints, that understands the needs of the master and anticipates them. The last thing an owner will want is a robot with an attitude, one that talks back, criticizes people, and whines. Helpful criticisms are important, but they must be made in a constructive, tactful way. Also, if humans give it conflicting commands, the robot should know to ignore all of them except those coming from its owner. Empathy will be another emotion that will be valued by the owner. Robots that have empathy will understand the problems of others and will come to their aid. By interpreting facial movements and listening to tone of voice, robots will be able to identify when a person is in distress and will provide assistance when possible. Strangely, fear is another emotion that is desirable. Evolution gave us the feeling of fear for a reason, to avoid certain things that are dangerous to us. Even though robots will be made of steel, they should fear certain things that can damage them, like falling off tall buildings or entering a raging fire. A totally fearless robot is a useless one if it destroys itself. But certain emotions may have to be deleted, forbidden, or highly regulated, such as anger. Given that robots could be built to have great physical strength, an angry robot could create tremendous problems in the home and workplace. Anger could get in the way of its duties and cause great damage to property. (The original evolutionary purpose of anger was to show our dissatisfaction. This can be done in a rational, dispassionate way, without getting angry.) Another emotion that should be deleted is the desire to be in command. A bossy robot will only make trouble and might challenge the judgment and wishes of the owner. (This point will also be important later, when we discuss whether robots will one day take over from humans.) Hence the robot will have to defer to the wishes of the owner, even if this may not be the best path. But perhaps the most difficult emotion to convey is humor, which is a glue that can bond total strangers together. A simple joke can defuse a tense situation or inflame it. The basic mechanics of humor are simple: they involve a punch line that is unanticipated. But the subtleties of humor can be enormous. In fact, we often size up other people on the basis of how they react to certain jokes. If humans use humor as a gauge to measure other humans, then one can appreciate the difficulty of creating a robot that can tell if a joke is funny or not.
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Michio Kaku (The Future of the Mind: The Scientific Quest to Understand, Enhance, and Empower the Mind)