Novel devaluation methods to explore habits in humans

Imagine your brain has two modes of driving: Autopilot and Manual Control.

• Autopilot (Habits): You do things without thinking, like brushing your teeth or taking the same route to work. It's fast and efficient, but if the road suddenly changes, you might keep driving the old way even if it's wrong.
• Manual Control (Goal-Directed): You consciously decide what to do based on what you want right now. If you find out your favorite coffee shop is closed, you immediately choose a different one.

Scientists have been trying to figure out when we switch from "Manual" to "Autopilot" by using tests where they tell people, "Hey, the reward you usually get is now gone." In animal studies, this works great to show habits. But in humans, the old tests are like trying to test a car's autopilot by asking the driver to solve a math puzzle while driving—they get too distracted by the thinking part, and the test fails to show the true power of the habit.

This paper introduces two new, simpler ways to test human habits that work better.

1. The "Shooting Aliens" Game

Think of this like a fast-paced video game.

• The Setup: You have to shoot aliens that appear in different spots. You learn that "Pressing Left" always shoots the alien, no matter where it is.
• The Twist (The New Method): Usually, in old tests, the rules change slowly over a whole session. Here, the aliens suddenly jump to new spots in the middle of the game, but your "Left button" still works the same way.
• The Test: Later, the researchers tell you, "The points you get for shooting are now worthless."
• The Result: People who had practiced so much they were on "Autopilot" kept pressing the buttons even though the points were gone. They made more mistakes and took longer to stop. The surprise jumps in the game made the "Autopilot" mode kick in harder than before, proving that this new way of changing the game is a better way to catch habits in the act.

2. The "Hands-Attack" Game

This one feels more like a real-life reflex than a video game.

• The Setup: Imagine something is about to hit your hand. Your natural instinct is to pull your hand away (avoidance).
• The Twist: Instead of just pulling away, you are trained to do the opposite: you have to push toward the threat to "counterattack" and get a reward.
• The Test: The researchers change the rules so that pulling away is now the "good" move, but you have to force yourself to stop doing your trained "counterattack."
• The Result: Even without hours of boring practice, people showed signs of being stuck in their old "counterattack" habit. It was like trying to stop a sneeze; even when you knew you shouldn't do it, your body wanted to. Interestingly, when the "attack" was something very familiar, people were better at stopping their automatic reaction, but it took them longer to think it through.

Why This Matters

The paper claims these two methods are like specialized tools that fix the problems of the old tests:

1. The Shooting Aliens game catches habits without making your brain work too hard on remembering rules (it doesn't overload your "working memory").
2. The Hands-Attack game catches habits that feel real and natural, without needing long, artificial training sessions.

The authors say these tools are ready to be used in places like clinics, especially when doctors or researchers don't have much time or when patients can't handle complex, long tests. They offer a quicker, clearer way to see how much our brains are running on "Autopilot."