
The Candle Problem is a cognitive performance test created by German psychologist Karl Duncker in 1945 to investigate individuals' problem-solving approaches when presented with a collection of commonly used objects. In the experiment, participants are tasked with securing a candle onto a wall using a box of thumbtacks and a set of matches, without allowing wax to drip onto a table below. The problem is a classic example of functional fixedness, where people struggle to think of a box of tacks as anything other than a container. In 1962, Sam Glucksberg repeated Duncker's experiment, introducing financial incentives for one group of participants. Interestingly, the group with incentives took longer to solve the problem, suggesting that incentives can hinder creativity and innovative thinking. This phenomenon, known as the distraction effect, has been further explored by researchers such as Dan Ariely, who found that higher financial incentives led to worse performance in tasks requiring cognitive skills. Thus, the Candle Problem and subsequent variations have provided valuable insights into the complex relationship between incentives and creativity.
| Characteristics | Values |
|---|---|
| Effect of incentives on creativity | Negative |
| Effect of incentives on routine tasks | Positive |
| Effect of deadlines on creativity | Negative |
| Effect of incentives on "out of the box" thinking | Negative |
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What You'll Learn

The negative impact of incentives on creativity
In 1962, Sam Glucksberg built upon Duncker's experiment by introducing incentives. Participants were divided into two groups: one group was offered a monetary reward for solving the problem quickly, while the other group was not. Surprisingly, the group with incentives took longer to solve the problem, revealing the negative impact of incentives on creative problem-solving. This phenomenon has been referred to as the "distraction effect", where the focus on the reward narrows participants' thinking and blocks their ability to think creatively.
In conclusion, while incentives may motivate individuals to try harder, they can also have a negative impact on creativity. The presence of incentives can narrow our focus and block our ability to think "outside the box", which is crucial for creative problem-solving. Understanding the limitations of incentives is essential for organizations aiming to unlock the full potential of their employees and foster a culture of innovation.
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The role of deadlines and their effect on creativity
Deadlines can have a significant impact on creativity, and this effect can be both positive and negative. While some individuals are naturally creative under pressure, others thrive in low-pressure environments where they are free to explore alternatives without the fear of failure or criticism.
On the one hand, deadlines can provide structure and motivation, encouraging individuals to focus their efforts and manage their time effectively. They can also create a sense of urgency that may spur individuals to take unique approaches and execute tasks in innovative ways. Additionally, moderate anxiety induced by deadlines can push individuals to action and help them overcome procrastination.
On the other hand, deadlines can hinder creativity when they are too strict and do not allow for the exploration of new ideas. The constant reminder of impending deadlines can make it difficult for some to think freely and experiment. This can lead to a rush to complete tasks, resulting in lower quality work. The threat of punishment or loss associated with missing a deadline can also induce anxiety and avoidance motivation, pushing individuals into an analytical mindset that may hinder creative insights.
The impact of deadlines on creativity is further complicated by individual differences. While some may find that deadlines sharpen their focus and catalyze creative thinking, others may experience burnout and feel unmotivated when faced with time constraints.
In the context of the candle problem, the presence of deadlines in the form of financial incentives had a detrimental effect on performance. In Sam Glucksberg's 1962 study, participants who were offered monetary incentives for solving the problem faster took longer, on average, to complete the task. This suggests that the pressure of the deadline, coupled with the mental block induced by the incentive, hindered the creative insight required to solve the problem efficiently.
In summary, deadlines can have a complex and varied impact on creativity. While they may provide structure and motivation for some, they can also induce anxiety, hinder creative thinking, and lead to lower quality work. The key to harnessing the positive effects of deadlines while mitigating the negative ones lies in finding a balance between structure and flexibility, allowing for both focused effort and the freedom to explore creative alternatives.
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How incentives affect divergent thinking
The candle problem is a cognitive performance test designed by psychologist Karl Duncker in 1945 to investigate individuals' problem-solving approaches when presented with a collection of commonly used objects. Participants are tasked with securing a candle onto a corkboard wall, preventing wax from dripping onto a table below. They are provided with a box of thumbtacks and a set of matches.
In 1962, Sam Glucksberg, a Canadian professor at Princeton, repeated this experiment with a twist: he introduced incentives. Glucksberg divided participants into two groups. One group was offered a monetary reward for solving the problem quickly, while the other group received no such incentive. The group with the incentive took, on average, three and a half minutes longer to solve the problem.
Glucksberg's findings suggest that while incentives may be beneficial for problems that do not require creativity, they can hinder "out-of-the-box" thinking. This is because incentives tend to narrow our focus, making it harder to think creatively and blocking our ability to think creatively. This phenomenon is known as ""functional fixedness", where people see the box of tacks and only think of its traditional use, failing to consider that the box might have another use, such as a holder for the candle.
The candle problem highlights the limited effectiveness of incentives in fostering creativity. Instead, intrinsic human motivation relies on autonomy, mastery, and purpose. By aligning with these principles, organizations can unlock the full potential of their employees.
Additionally, deadlines and the threat of punishment associated with them can also negatively impact creative work. Moderate anxiety may motivate individuals to meet deadlines, but the pressure to produce something by a certain time can hinder innovation and creative problem-solving.
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The impact of financial incentives on cognitive skills
In 1945, German psychologist Karl Duncker devised the Candle Problem, a cognitive performance test to investigate individuals' problem-solving approaches when presented with a collection of commonly used objects. Participants were tasked with securing a candle onto a corkboard wall, preventing wax from dripping onto a table below. They were provided with a box of thumbtacks and a set of matches.
In 1962, Sam Glucksberg, a Canadian professor at Princeton, repeated Duncker's experiment with a twist: he introduced financial incentives. The participants were divided into two groups. Group One was told that the top 25% fastest times would receive a $5 prize, and the fastest overall time would receive $20. Group Two was not incentivized and was told they were conducting the experiment to determine an average resolution time.
The results showed that the incentivized group took longer to arrive at a solution compared to the non-incentivized group. Glucksberg's findings suggest that while financial incentives may be beneficial for problems that do not require creativity, they hinder "out-of-the-box" thinking. This phenomenon, where higher incentives lead to worse performance on tasks requiring cognitive skills, has been termed the "distraction effect."
The Candle Problem highlights the limited effectiveness of financial incentives in fostering creativity. It demonstrates that external incentives can act as a mental block, narrowing our focus and reducing our ability to think creatively. This is particularly true when deadlines are involved, as the threat of punishment or loss associated with missing a deadline can cause anxiety and push individuals into an analytical mindset, making it harder to innovate.
However, it is important to note that financial incentives are not inherently detrimental to cognitive skills. They can be effective for routine tasks and problems with a simple set of rules, where narrowing our focus can lead to better performance. Additionally, once the tacks were removed from the box in the Candle Problem, the incentivized group performed better, suggesting that incentives can be beneficial when the problem does not require a change in perspective.
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The relationship between incentives and functional fixedness
The candle problem is a classic thought experiment that highlights the impact of functional fixedness on problem-solving abilities. The problem involves participants being given a candle, a box of matches, and a box of thumbtacks, and they are tasked with finding a way to securely attach the candle to a wall without the wax dripping onto a table below. The catch is that the thumbtack box must be used as a candle holder, which requires participants to overcome their functional fixedness on the box's use.
Functional fixedness refers to the cognitive bias that limits individuals' ability to think beyond an object's traditional function. In the case of the candle problem, participants often struggle to think of the thumbtack box as anything other than a container for the tacks. This bias impedes their creativity and problem-solving skills, making it challenging to identify the box as a potential solution to the problem.
In 1962, Sam Glucksberg built upon Karl Duncker's original candle problem experiment by introducing incentives. Glucksberg divided participants into two groups: one group was offered monetary rewards for solving the problem quickly, while the other group received no such incentive. Counterintuitively, the group with incentives took longer to solve the problem, demonstrating that incentives hindered their creative problem-solving abilities.
Glucksberg's findings suggest a complex relationship between incentives and functional fixedness. While incentives can motivate individuals to try harder, they may also narrow their focus and limit their creativity. This is particularly true for problems that require "out-of-the-box" thinking, as the pressure to perform can push individuals into an analytical mindset, making it harder to identify novel solutions.
The negative impact of incentives on creativity has been observed in other studies as well. For tasks requiring cognitive skills, higher rewards have been associated with worse performance, a phenomenon known as the "distraction effect." This effect suggests that the presence of incentives can steal attention away from the task at hand, hindering creative problem-solving abilities.
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Frequently asked questions
The candle problem is a cognitive performance test designed by German psychologist Karl Duncker in 1945 to investigate individuals’ problem-solving approaches when presented with a collection of commonly used objects. Participants are tasked with securing a candle onto a corkboard wall, preventing wax from dripping onto a table below. To aid in this endeavour, the participants are provided with a box of thumbtacks and a set of matches.
In 1962, Sam Glucksberg conducted a variation of the candle problem experiment, introducing incentives to assess their impact on creativity in problem-solving. The participants were divided into two groups, with one group offered a monetary reward for solving the problem quickly, and the other group receiving no incentive. Surprisingly, the incentivized group took longer to arrive at a solution, suggesting that incentives can hinder creativity by narrowing our focus and blocking our ability to think "outside the box".
Yes, in the original candle problem experiment, Karl Duncker found that when the thumbtacks were placed separately from the box, the rate of success increased for the incentivized group. Additionally, the type of task can also play a role, as incentives may be beneficial for simple or mechanical tasks but can hinder performance in tasks requiring even rudimentary cognitive skills. Deadlines and the associated threat of punishment can also negatively impact creativity, causing anxiety and pushing individuals into an analytical mindset.











































