I taught rats to drive. They taught me to enjoy the ride | Kelly Lambert - TED Talks Daily Recap

Podcast: TED Talks Daily

Published: 2026-03-18

What Happened

Behavioral neuroscientist Kelly Lambert trained rats to drive tiny cars, leading to insights about joy and the importance of positive emotions. Lambert's research initially focused on negative emotions such as fear, anxiety, and depression. However, observing rats displaying behaviors that seemed to indicate joy prompted her to explore positive emotional states.

Lambert introduced the concept of 'behaviorceuticals,' where intentional behavioral changes could alter neurochemistry in therapeutic ways. Her experiments showed that rats exerting physical effort for rewards demonstrated enhanced emotional resilience and neuroplasticity compared to those who received rewards without effort.

In her quest to understand joy, Lambert discovered that anticipation plays a crucial role in positive emotional experiences. Through a protocol called 'unpredictable positive event responses' or 'uppers,' rats were exposed to enjoyable activities in an unpredictable manner, which seemed to increase their optimism and exploratory behavior.

Lambert noted that the positive anticipation observed in rats paralleled findings in human studies, such as research on the Make a Wish Foundation's impact on children's health. These studies suggest that hope and positive anticipation can improve health outcomes and quality of life.

Lambert's work also referenced classic studies, such as Kurt Richter's research on rats' swimming behavior, which highlighted the role of hope and the possibility of rescue in survival. The idea that positive anticipation and experiences are critical for mental health and brain maintenance was emphasized.

In a final experiment, Lambert observed that rats preferred to drive to their rewards rather than take a more efficient walking path, suggesting that the act of driving itself was a source of joy. This finding underscored the importance of incorporating pleasure and positive events into daily life for both animals and humans.

Key Insights

• Kelly Lambert's research demonstrated that rats trained to exert physical effort for rewards showed improved emotional resilience and neuroplasticity compared to those who did not exert effort.
• The concept of 'behaviorceuticals' was introduced, suggesting that intentional behavioral changes can alter neurochemistry and improve mental health.
• Lambert found that anticipation of positive experiences plays a crucial role in emotional well-being, as shown by rats' increased optimism and exploration under the 'unpredictable positive event responses' protocol.
• The preference of rats to drive to their rewards, despite a more efficient walking path, indicated that the act of driving was a joyful experience, highlighting the importance of pleasure in maintaining mental health.