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The trigger is the actuator of a behavior—the spark plug in the engine. Triggers come in two types: external and internal. Habit-forming technologies start by alerting users with external triggers like an email, a link on a web site, or the app icon on a phone. By cycling continuously through successive desire engines, users begin to form internal triggers, which become attached to existing behaviors and emotions. Soon users are internally triggered every time they feel a certain way.  The internal trigger becomes part of their routine behavior and the habit is formed.

After the trigger comes the intended action. Here, companies leverage two pulleys of human behavior – motivation and ability. To increase the odds of a user taking the intended action, the behavior designer makes the action as easy as possible, while simultaneously boosting the user’s motivation. This phase of the desire engine draws upon the art and science of usability design to ensure that the user acts the way the designer intends.

Variable schedules of reward are one of the most powerful tools that companies use to hook users. Research shows that levels of dopamine surge when the brain is expecting a reward. Introducing variability multiplies the effect, creating a frenzied hunting state, which suppresses the areas of the brain associated with judgment and reason while activating the parts associated with wanting and desire. Although classic examples include slot machines and lotteries, variable rewards are prevalent in habit-forming technologies as well.

The exciting juxtaposition of relevant and irrelevant, tantalizing and plain, beautiful and common sets her brain’s dopamine system aflutter with the promise of reward. Now she’s spending more time on the site, hunting for the next wonderful thing to find. Before she knows it, she’s spent 45 minutes scrolling in search of her next hit.

What separates the desire engine from a plain vanilla feedback loop is the engine’s ability to create wanting in the user. Feedback loops are all around us, but predictable ones don’t create desire. The predictable response of your fridge light turning on when you open the door doesn’t drive you to keep opening it again and again. However, add some variability to the mix—say a different treat magically appears in your fridge every time you open it—and voila, desire is created. You’ll be opening that door like a lab rat in aSkinner box.

unlike a sales funnel, which has a set endpoint, the commitment phase isn’t about consumers opening up their wallets and moving on with their day. The commitment implies an action that improves the service for the next go-around.  Inviting friends, stating preferences, building virtual assets, and learning to use new features are all commitments that improve the service for the user. These commitments can be leveraged to make the trigger more engaging, the action easier, and the reward more exciting with every pass through the desire engine.

As Barbra enjoys endlessly scrolling the Pinterest cornucopia, she builds a desire to keep the things that delight her. By collecting items, she’ll be giving the site data about her preferences. Soon she will follow, pin, re-pin, and make other commitments, which serve to increase her ties to the site and prime her for future loops through the desire engine.

Humans, like the mice in Skinner’s box, crave predictability and struggle to find patterns, even when none exist. Variability is the brain’s cognitive nemesis and our minds make deduction of cause and effect a priority over other functions like self-control and moderation.

Recent neuroscience has revealed that our dopamine system works not to provide us with rewards for our efforts, but to keep us searching by inducing a semi-stressful response we call desire.

Email, for example, is addictive because it provides all three reward types at random intervals. First, we have a social obligation to answer our emails (the tribe). We are also conditioned to know that an email may tell us information about a potential business opportunity (the hunt). And finally, our email seems to call for us to complete the task of removing the unopened item notification in a sort of challenge to gain control over it (the self). Interestingly, these motivations go away as soon as we’ve actually opened all our emails and the mystery disappears. We’re addicted to checking email while there is still variability of reward and once that’s gone, emails languish in our inboxes.

We’re meant to be part of a tribe so our brains seek out rewards that make us feel accepted, important, attractive, and included.

But as sociable as we are, our individual need for sustenance is even more crucial. The need to acquire physical things, such as food and supplies, is part of the brain’s operating system and we clearly wouldn’t have survived the millennia without this impulse. But where we once hunted for food, today we hunt for deals and information. The same compulsion that kept us searching for food coerces us to open emails from Groupon and Appsumo. New shopping startups make the hunt for products entertaining by introducing variability to what the user may find next. Pinterest and Wanelo keep users searching with an endless supply of eye candy, a trove of dopamine flooding desirables. To see an example of how the hunt for information engages users, look no further then the right side of this page. There, you will find a listing of popular posts. Using intriguing images and short, attention-grabbing text, the list is a variable reward mechanism designed to keep you hunting for your next discovery.

We also seek mastery of the world around us. Game mechanics, found everywhere from Zynga games to business productivity apps like to-do lists, provide a variable rewards system built around our need to control, dominate, and complete challenges. Slaying new messages in your inbox stimulates neurons similar to those stimulated by playing StarCraft.

Variable rewards come in three types and involve the persistent pursuit of: rewards of the tribe, rewards of the hunt, and rewards of the self.

As B.F. Skinner discovered over 50 years ago, variable rewards are a powerful inducement to creating compulsions.

Finally, a habit is formed. Users no longer require an external stimulus to use Instagram because the internal trigger happens on its own. As Yin said, “I just use it whenever I see something cool.” Having viewed the “popular” tab of the app thousands of times, she’s honed her understanding of what “cool” is. She’s also received feedback from friends who reward her with comments and likes. Now she finds herself constantly on the hunt for images that fit the Instagram style. Like a never-ending scavenger hunt, she feels compelled to capture these moments.

Adaptive. As customer interactions fragment across devices, experiences must perform reliably across an expanding interface landscape that includes PCs, laptops, smartphones, tablets, and, increasingly, TVs and cars. But just having a presence on these devices is not enough. Experiences must persist across these devices

Further, they need to become polymorphic, taking advantage of the connected devices that surround us to delivernew multi-device experiences that were not possible before.

As consumers adjust to post-PC realities, they expect companies to provide the right mix of content and functionality at the right time and right place.

design and customer understanding, not technology, will rule the post-PC era. In a time when you can hire a handful of engineers to build just about anything you want, value shifts from what is possible to what is desirable.