PDF Summary:Good Habits, Bad Habits, by Wendy Wood

Have you ever tried to change a habit, only to find yourself reverting to your old ways no matter how hard you try? Do you believe that your inability to change is due to a lack of willpower or self-control? According to psychologist Wendy Wood, this isn’t the case.

In Good Habits, Bad Habits, Wood argues that relying on willpower alone to change habits is a losing battle—because the harder you try to overcome unwanted habits, the stronger those habits become. She suggests that understanding how habits form can help you easily and effectively change your unwanted habits or introduce new ones without having to rely on constant willpower.

This guide walks you through Wood’s ideas about habit formation and change. We’ll also expand on her insights with research and actionable methods from other behavioral scientists and psychologists.

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• Perform the same behavior in different contexts: Sometimes, you also reach for the remote when talking on the phone, playing with your kids, or eating dinner.
• Perform different behaviors in the same context: Sometimes you pick up a book or a sewing project when you sit on the sofa.

This is because your habitual system relies on behavioral patterns to form your habits: When you regularly perform a specific behavior within a specific context, it sees a clear pattern and creates a context-behavior association, turning that behavior into a habit. However, when you keep changing your behaviors or their contexts, your habitual system fails to detect a pattern and doesn’t form the context-behavior association required to turn that behavior into a habit.

This explains why habits are often situation-dependent. For example, say you regularly reach for the remote when sitting on your sofa, but don’t do so when sitting on a sofa in someone else’s home. In this case, your habitual system will only push you to engage in this habit when you’re at home.

Predictive Processing and Pattern Detection

Neurological research clarifies why consistency in behavior and context is essential for habit formation: The habitual system relies on predictive processing, a mechanism that continuously generates expectations about what will happen next based on repeated experiences in the same context.

When you perform the same behavior consistently in the same situation, predictive processing becomes more accurate, allowing the habitual system to easily recognize your behavioral patterns. But when either the behavior or context frequently changes, predictive processing receives conflicting information. This prevents it from forming accurate predictions about how you’ll respond to a situation, making it difficult for the habitual system to figure out your preferences.

Element #2: Repetition

As we’ve discussed, your habitual system relies on behavioral patterns to form context-behavior associations. This is why the second element of habit formation—repetition—is so important: The more often you engage in the same behavior in the same context, the easier it is for your habitual system to identify a pattern and form a context-behavior association. However, Wood explains that even after your habitual system forms a context-behavior association, it relies on repetition to turn that association into an automatic habit.

This is due to the way neural pathways inform your behaviors: When your habitual system first forms an association, the neural pathway connecting the context cue to the behavior is weak and underdeveloped—meaning it’s not yet the default response for that cue. As a result, you still need to apply conscious effort to perform the behavior in that context. For example, before TV-watching became a habit, you likely considered alternative actions when you sat on the sofa before deciding to pick up the remote.

However, repeating the same behavior in the same context strengthens this neural pathway, solidifying the connection between the cue and behavior until it becomes your default response. This lets your habitual system instantly respond to the cue without conscious involvement: It activates the behavior before you have time to consider other options. At this point, the behavior has become an automatic habit.

(Shortform note: Neuroscience research adds to Wood’s explanation, highlighting the role of a process called myelination in strengthening neural pathways. New neural pathways are like uninsulated electrical wires—they can transmit signals, but the signals are slow and prone to energy leakage. They can’t solidify the connection between a cue and a behavior until a sheath of fat called myelin forms around the pathway, insulating it and preventing energy loss. The more you repeat a behavior in the same context, the more myelin forms around the pathway, making it stronger and more efficient, increasing the likelihood of that behavior becoming your default response.)

How Long Does It Take to Form an Automatic Habit?

According to Wood, there’s no set timeline for when context-behavior associations become automatic. This process depends on the complexity of the behavior, how consistently you do it in response to the cue, and your learning speed. (Shortform note: Similarly, James Clear (Atomic Habits) suggests that there’s no set timeline for forming a habit. He explains that your current habits were formed through multiple repetitions over many months or years—every repetition strengthened the neural pathways underlying the habit, ingraining the context-behavior association deeper into your brain. For this reason, he argues that instead of asking how much time habit-formation will take, you should ask how many times it will take.)

Element #3: Rewards

The third element of habit formation—rewards—helps your habitual system identify what context-behavior associations are worth reinforcing. Wood explains that enjoying a positive outcome for performing a behavior in a specific context releases dopamine (a pleasurable neurochemical) into your bloodstream. This dopamine release makes you feel good, teaching your habitual system to strengthen that context-behavior association.

(Shortform note: Duhigg (The Power of Habit) adds a step to this process, stating that rewards can only encourage your habitual system to strengthen context-behavior associations once you crave them. A craving is the anticipation of a reward. The more often you perform a rewarded behavior, the more your habitual system associates that behavior’s context cue with the reward. This causes your dopamine levels to spike as soon as you perceive the cue—in other words, you feel pleasure before you even engage in the behavior. And, because your brain expects to receive the reward, it encourages you to follow through with the behavior to “cash in.”)

According to Wood, rewards must be immediate, occurring within seconds or minutes of performing the behavior. This is because your habitual system learns from immediate consequences rather than long-term ones; it can’t identify a behavior as rewarding unless you enjoy a pleasurable dopamine release right away. She adds that you’re more likely to experience an immediate release of dopamine when you find the behavior itself enjoyable. For example, when you sit on the sofa and reach for the remote, you experience the immediate pleasure of relaxation.

(Shortform note: Why are you more likely to enjoy a dopamine release when rewards are immediate rather than delayed? Research suggests it’s because your reward system evolved to prioritize actions that offer immediate gratification. For your ancestors, seizing opportunities with instant benefits increased their chances of survival in unpredictable environments. In contrast, waiting for delayed rewards was often too risky or uncertain.)

Additionally, Wood suggests that variable rewards strengthen context-behavior associations. When rewards for performing a behavior are unpredictable—sometimes they’re big, but at other times less so—your habitual system never knows what to expect. This uncertainty about what reward you’ll receive keeps your habitual system in a state of anticipation. Each instance of engaging in the behavior could potentially offer a satisfying reward.

For example, if in addition to your regular shows you sometimes find movies you’ve been eager to watch, your habitual system will be in a greater state of anticipation each time you sit on the sofa. The possibility of watching something new creates more anticipation than always watching the same shows.

(Shortform note: Some industries may take advantage of your brain’s preference for variable rewards to siphon your time, attention, and money. For example, productivity expert Cal Newport (Digital Minimalism) describes how social media apps compel you to keep using them by deliberately providing variable rewards. You can’t predict when logging on will feel rewarding (sometimes you’ll receive likes and comments, and other times you won’t), so the action never loses its appeal. In Irresistible, Adam Alter explains that casinos use the same techniques to keep players gambling; this is how both social media and the gambling industry make most of their money.)

Wood explains that the more your habitual system anticipates a reward, the more dopamine gets released into your bloodstream in response to the context cue. This occurs while you anticipate it, before you perform the behavior. This anticipatory dopamine release teaches your habitual system to strengthen that context-behavior association more effectively than predictable rewards would.

Anticipating a Reward Feels More Pleasurable Than Experiencing a Reward

Clear (Atomic Habits) adds further insight into how anticipatory dopamine releases strengthen context-behavior associations. He explains that dopamine spikes occur both when you anticipate pleasure and when you experience pleasure. However, your emotional reaction when you’re anticipating or craving a reward is 10 times stronger than it is when you’re actually receiving or experiencing the reward.

The pleasure you experience when you’re craving something is so strong that it motivates you to perform the behavior when you see the context cue. However, once you receive the reward, your feelings of pleasure remain neutral because you’ve already experienced the high of anticipation. Consequently, the reward you receive feels less satisfying than the anticipation you feel about receiving it. For example, looking back on your childhood, consider how much more exciting the days leading up to Christmas were than actual Christmas morning. Or, think about how eager you felt about going on your first date with your partner, compared to how you felt while experiencing that date.

This difference between dopamine levels in the anticipating and receiving stages clarifies why people suffer from addictions—their anticipation overrides the pleasure they receive from the addictive substance or behavior, so they repeatedly overindulge in the reward in an attempt to match the high of anticipating it. When this fails, they feel like they’re missing something, and they continue to overindulge in an attempt to fill that void.

Established Habits Continue Without Ongoing Rewards

Wood explains that the combination of repetition and rewards is important early on because it trains your habitual system to strengthen a context-behavior association. As we’ve discussed, this process solidifies the neural pathway connecting the context cue to the behavior, turning that behavior into the default, automatic response for that cue. Once a habit is solidified, you’ll engage in the behavior regardless of whether you receive a reward. This explains why you engage in habits that no longer appeal to or benefit you—for example, you sit on the sofa and reach for the remote even when you know there’s nothing worth watching on TV.

(Shortform note: According to Nir Eyal (Hooked), your habits are more likely to continue without ongoing rewards when you’ve invested in them: The more time, energy, and value you put into something, the stronger your habitual attachment to it becomes—even when the original reward disappears. This is because investment gives you something to lose if you were to stop the habit, and this fear of loss reinforces the habit. For example, if you’ve spent a lot of time, effort, and money setting up your streaming services, you’ll likely continue to reach for the remote even when there’s nothing good to watch to avoid feeling like you’ve wasted your investment.)

Part 3: How to Change Your Habits

We’ve just explained the three elements that fuel habits: context cues, repetition, and rewards. Now, we’ll explore how you can apply that information to change unwanted habits or create entirely new ones.

Change Unwanted Habits

Since established habits are permanently stored in your habitual system, you can’t simply delete the ones you no longer want. However, that doesn’t mean you’re stuck with them.

Wood suggests that you can break free from an unwanted habit by manipulating its context cue and replacing the associated behavior with a more productive one. This process doesn’t involve manipulating rewards since, as previously explained, established habits operate independently of rewards—removing the reward you receive for a habit won’t weaken its context-behavior association.

(Shortform note: Neuroscientists confirm that once your brain permanently stores an automatic pattern, it’s impossible to delete it. But it’s possible to weaken this pattern so that your brain no longer relies on it for instructions about what to do in a given situation. As Wood suggests, this weakening process involves practicing new behavioral patterns to encourage the formation of new neural pathways. Research also backs up the idea that reward manipulation won’t weaken established context-behavior associations. Computational models of habit formation show that entrenched habits become value-free, operating independently of the value of the outcome. In other words, they persist regardless of whether the original reward remains intact.)

Wood offers three methods that, when used together, can help you redesign your unwanted habits: Remove context cues, make it inconvenient to engage in your default behavior, and replace your default behavior. Let’s explore each.

Method #1: Remove Context Cues

Since habits activate in response to specific cues in your environment, removing context cues for the habits you want to change can disrupt them. As Wood explains, without those cues, there’s nothing in your environment to trigger your habits. For example, you might move your sofa out of the TV room or, instead of keeping your remote next to your sofa, put it in the TV cabinet so it’s out of sight.

(Shortform note: Not all habits have a clear-cut routine like the one described above, especially if they’re emotional rather than behavioral. For example, say you feel habitual low-level anxiety throughout your day. You might be able to identify and avoid some context cues, like a specific person who provokes anxiety, but if that doesn’t resolve the problem, you might have trouble identifying other context cues to remove. According to neuroscientist Judson Brewer (The Craving Mind), being more mindful helps you develop conscious awareness of the specific cues that trigger your emotional habits. It follows that practicing mindfulness can help you figure out what cues to avoid.)

Method #2: Make It Inconvenient to Engage in Your Default Behavior

As it stands, you engage in your habits because they’re easy and don’t require any conscious effort—for example, keeping your remote next to the sofa allows you to reach for it without having to think about it. Wood says that making an unwanted habit inconvenient prevents you from automatically engaging in it when you see the cue. Instead, it forces you to make a conscious effort, which gives you a chance to redirect your behavior.

For example, let’s say you put the remote on a very high shelf and turn the TV to face the wall. After sitting on the sofa, you’d need to decide whether it’s worth making the effort to watch TV. Since this would involve finding a chair to stand on to reach the remote and fiddling with the TV to get it into the right position, you might decide that it’s not worth the effort.

(Shortform note: Inconveniences disrupt habits because they create what Tara Brach calls “the essential pause”—an opportunity to stop and think. In Radical Acceptance, Brach explains that the power of the essential pause comes from uncertainty: When you’re acting out of instinct or habit, you mindlessly react to cues instead of thinking about what you’ll do next. However, interrupting that process pulls you out of this state of mindlessness, leaving you uncertain about what to do next. This gives you the chance to consciously choose how you’ll respond to a cue.)

Method #3: Replace Your Default Behavior

While removing context cues and making behaviors inconvenient are effective at disrupting unwanted habits, these methods alone won’t prevent your habitual system from driving you to engage in those habits when:

• You encounter context cues by chance—for example, if your partner leaves the remote on the coffee table.
• Circumstances prevent you from maintaining the inconveniences—for example, if your partner bans you from turning the TV to face the wall.

Therefore, Wood says you need to train your habitual system to associate the context cue for your unwanted habit with a behavior you want to engage in. To achieve this, consciously engage in your chosen behavior when you encounter the context cue. Repeat this new context-behavior pairing until your habitual system forms a strong association and turns it into a new automatic habit. For example, if you want to replace reaching for the remote with reading a book when you sit on the sofa, you need to consciously choose to read each time. With enough repetition, your habitual system will associate sitting on the sofa with reading, regardless of whether or not the remote’s within reach.

(Shortform note: According to Duhigg (The Power of Habit), your new behavior won’t stick unless it satisfies the same underlying reward your unwanted habit provides. The underlying reward is the psychological or physical need your habit fulfills—such as stress relief, entertainment, social connection, or mental stimulation. For example, if you reach for the remote because you want to unwind, an effective replacement behavior would be one that helps you relax (reading might work). But if you reach for the remote because you want mental stimulation, an effective replacement behavior would have to exercise your mind (for example, doing a puzzle).)

Form a New Habit

Unlike changing an unwanted habit, where you’re working against an existing context-behavior association, forming a new habit involves creating a context-behavior association from scratch. Wood offers four methods that, when practiced together, will enable your habitual system to turn your desired behavior into an automatic habit: Build on an existing habit, establish clear and consistent context cues, make it easy to engage in your desired behavior, and reward yourself.

Let’s explore how to apply these methods to form the new habit of taking vitamins every morning.

Method #1: Build on an Established Habit

Wood suggests that one of the most effective ways to form a new habit is to link it to an existing habit. This lets you leverage established context-behavior associations rather than creating entirely new ones. In other words, you can use an existing habit to trigger your desired habit. For example, if you already have a habit of drinking coffee every morning, you could place your vitamins next to your coffee machine and take them immediately after pouring your first cup. With enough repetition, your habitual system will associate that first cup with taking vitamins, eventually making vitamin-taking part of your habitual morning routine.

(Shortform note: James Clear (Atomic Habits) adds two recommendations to this advice: First, build on habits you enjoy. This way, you’ll effortlessly integrate immediate rewards for your desired behavior, which will help to strengthen the new context-behavior association. Second, set a very specific implementation intention, using one of two formulas: “When X occurs, I will do Y” or “At X time, I will do Y.” This will increase your chances of following through with your desired behavior by removing the need to make decisions or summon up motivation when the moment of choice occurs.)

Method #2: Establish Consistent Context Cues

Since your habitual system relies on consistent patterns to form context-behavior associations, you’ll need to establish obvious context cues and a predictable routine to help your habitual system identify the new pattern and form a strong context-behavior association for it. This means performing your new behavior in the same context every time, such as at the same time or in the same location. For example, take your vitamins every morning after pouring your first cup of coffee while standing at your kitchen counter.

(Shortform note: Like Wood, many habit experts suggest that predictable routines are key to establishing new habits. However, life doesn’t always give you the perfect day, so rigid routines can be easily thrown off. For example, if you always take your vitamins after your first cup of coffee, then running late one morning might make you skip your coffee (and, by extension, your vitamins) entirely. In contrast, flexible routines—like taking your vitamins whenever you’re in the kitchen in the morning, regardless of the time or if you have a coffee—help you develop what Leo Babauta calls “habit resilience,” the ability to get shaken up, adjust, care for yourself, and persevere. This, Babauta says, determines who can form habits that last and who slips backward.)

Method #3: Make It Easy to Engage in Your Desired Behavior

The less conscious effort a behavior requires—meaning the less you need to think about if you want to do it or how you’ll do it—the easier it is for your habitual system to make it automatic. Therefore, Wood suggests making your desired behavior as easy as possible. This involves identifying and removing any factors that might require you to make a conscious effort. For example, taking multiple vitamins requires you to open different bottles and take out vitamins one by one. You might minimize the effort required by pre-sorting your daily vitamins into a weekly pill organizer that you keep next to your coffee machine.

(Shortform note: According to behavioral scientist BJ Fogg (Tiny Habits), reducing effort only makes performing a new behavior easier if you address the most impactful types of effort involved. To identify what those are, examine how compatible the desired behavior is with your existing routines, as well as the time, money, physical effort, and mental effort it demands. For example, pre-sorting vitamins into a pill organizer won’t help if you consistently forget to buy them—in that case, the first factor you need to address is creating a reliable reminder system.)

Method #4: Reward Yourself

As previously explained, rewards effectively strengthen context-behavior associations when they’re immediate, tied directly to performing the behavior, and unpredictable. Therefore, Wood suggests that you find a variety of ways to make your desired behavior feel more rewarding. For example, you might make the act of taking vitamins unpredictably enjoyable by mixing your favorite flavors, introducing gummy or effervescent vitamins into your mix, or sometimes taking them with sparkling water instead of regular water.

(Shortform note: While habit experts agree that rewards strengthen context-behavior associations, they warn that poorly chosen rewards can undermine your new habits when they work against what you’re trying to achieve. For example, if you want to take vitamins to improve your health, but reward yourself for taking them with something unhealthy (like a sugary soda), you immediately undo the health benefits you just gained. To choose rewards that support rather than sabotage your new habit, you should first clarify why you want to adopt your new habit.)