Summary: Avoiding activities that previously caused pain can lead people to avoid other tasks that are actually safe. This generalization of avoidance can extend beyond physically similar movements to whole categories of activities, producing unnecessary limitations on daily life and valued pursuits.
A controlled study with healthy volunteers shows that learned pain avoidance can spread to both perceptually similar tasks and to conceptually related activities—such as avoiding various cleaning tasks after a painful experience during one cleaning action. These findings underscore the importance of understanding avoidance generalization to improve treatment for chronic pain.
Key facts:
- Avoidance of pain can generalize to conceptually related activities that are actually pain-free.
- Generalized avoidance appears to depend on the conceptual categories people assign to activities, not only on perceptual similarity.
- Psychological factors are stronger predictors of chronic pain outcomes than injury severity, highlighting the clinical relevance of studying avoidance generalization.
Source: APS
Chronic pain can severely limit work, hobbies, and social life. People may skip meaningful experiences—like playing with children or engaging in sports—because they fear certain actions will trigger further pain. Avoiding dangerous activities can be adaptive, but when avoidance spreads to safe behaviors it can cause unnecessary disability.
Researchers Eveliina Glogan, Peixin Liu, and Ann Meulders from Maastricht University report in Psychological Science that avoidance learned from one painful experience can extend to other tasks that are conceptually related and actually harmless.
“When avoidance generalizes to safe movements and activities, it becomes problematic,” Glogan said. “Unnecessary avoidance can reduce participation in valued activities and, over time, contribute to disability.”
The study shows generalization happens in two ways: by perceptual similarity (for example, mopping and vacuuming involve similar arm movements) and by conceptual category (for example, mopping, dishwashing, and dusting are all labeled “cleaning”). The researchers designed an experiment to test how both forms of generalization influence avoidance in people without chronic pain.
Forty pain-free participants (30 female; mean age 25) completed a computerized task simulating everyday activities in two categories: gardening and cleaning. Participants first experienced progressively stronger electric shocks through electrodes until they rated a shock as 8 out of 10 in pain intensity. After this calibration, they practiced joystick-controlled “gardening” and “cleaning” tasks. Each task could be completed by either a direct, efficient joystick movement or by a longer, indirect route that required an extra joystick movement.
During the acquisition phase, completing tasks in one designated avoidance category (for example, mopping and vacuuming) via the direct route resulted in a painful shock 80% of the time. The indirect route and all tasks in the other category remained shock-free. Before every trial, participants rated their expected pain and fear for each route on a 0–100 scale.
After learning which routes and tasks were associated with pain, participants entered a generalization phase that introduced eight new gardening and cleaning tasks. These new tasks were never paired with shocks, and either route could be used without receiving pain.
Despite the absence of shocks in the generalization phase, participants strongly preferred the indirect, longer route for tasks similar to those that had previously triggered pain. By the end of acquisition, they were more than five times as likely to choose the indirect route for tasks whose direct route had been paired with shocks. For novel tasks within the same pain-associated category, participants were 1.8 times more likely to avoid the direct route compared to novel tasks from the safe category.
Participants also reported higher fear and pain expectations for the direct route during new tasks in the pain-associated category than for direct routes in the safe category. Even for new tasks from the safe category, fear and expected pain were higher than for familiar safe tasks, indicating partial uncertainty about safety.
These results show that avoidance behavior can generalize not only because two actions look or feel similar but also because people group activities together conceptually. In clinical terms, this means fears and avoidance can spread across semantic categories in idiosyncratic ways, making it important for treatment to identify the specific categories and beliefs that sustain avoidance.
Meulders emphasized that psychological variables predict chronic pain outcomes better than physical injury severity. Understanding how avoidance generalizes could therefore improve interventions by targeting the cognitive and semantic networks that support maladaptive avoidance.
Glogan and Meulders suggest future research should test whether these patterns are stronger or broader in people with chronic pain, who are thought to generalize avoidance more extensively than healthy individuals.
About this pain and psychology research news
Author: Leah Thayer
Source: APS
Contact: Leah Thayer – APS
Image: Image credited to Neuroscience News
Original research (open access): “Generalization of costly pain-related avoidance based on real-life categorical knowledge” by Eveliina Glogan et al., published in Psychological Science.
Abstract
Generalization of costly pain-related avoidance based on real-life categorical knowledge
Avoiding activities that pose bodily threat is adaptive, but when avoidance spreads to safe activities it may cause functional disability, especially in people with chronic pain. In a computerized joystick task, 40 pain-free adults completed activities from two categories (gardening and cleaning). One category was paired with the possibility of pain if participants used an efficient direct movement; avoiding pain required a less efficient indirect movement. Later, participants were tested on novel activities from both categories that were never paired with pain. Participants generalized avoidance to novel activities from the pain-associated category despite the absence of shocks and despite the cost in efficiency. These results indicate that costly pain-related avoidance can generalize across real-life categories of activities, potentially producing wide-reaching and detrimental consequences.