Eagleman answers listeners questions, debunks the myth of only using 10% of our brain, explores empathic responses, discusses the ineffectiveness of the Implicit Associations Test in courtrooms, and addresses questions about dreams and memory.
The myth that humans only use 10% of their brain may derive from a hopeful belief in untapped potential.
Automatic empathic responses to harm inflicted on outgroup members can be overridden by personal values and societal notions of fairness and equality.
Deep dives
The Myth of Using Only 10% of our Brain
The podcast debunks the common myth that humans only use 10% of their brain. It explains that all neurons in our brain are active and firing, even when we are asleep. The podcast speculates that the persistence of this myth may stem from a hopeful belief that we could be much smarter if we tapped into more of our brain's potential.
Ingroup and Outgroup Differences in Empathy
The podcast discusses a study that explores the brain differences in empathy when witnessing harm inflicted on ingroup and outgroup members. It reveals that individuals tend to have a lower empathic response when the victim belongs to an outgroup. The podcast emphasizes that these automatic reactions do not necessarily reflect a person's actual behavior. People have the capacity to override these reactions and act in line with their values and societal notions of fairness and equality.
Dreams and Visual Cortex
The podcast examines the connection between dreams and the visual cortex in the brain. It explains that when someone goes blind, the visual cortex can be taken over by neighboring brain territories. However, the podcast reveals that individuals who become blind later in life have more visual content in their dreams compared to those who become blind earlier. This suggests that the intact visual cortex leads to more visually experienced dreams. Additionally, the podcast highlights that the difficulty in remembering dreams is due to the shutdown of brain areas like the hippocampus and prefrontal cortex during dream sleep.