Summary
Highlights
The brain is presented as the biggest mystery in science, responsible for personality, thoughts, and feelings. Many brain processes occur outside conscious awareness, leading to questions about who is truly in control. Heather Berlin, a neuroscientist, embarks on a journey to discover what drives our decisions and the role of unconscious processes.
The documentary explores sleepwalking as an example of complex behaviors performed without conscious control. During sleepwalking, specific brain regions, like the prefrontal cortex (responsible for deliberate choices), remain asleep while others are active. Anesthesia further illustrates this, showing how drugs can suppress consciousness by disrupting communication between brain regions, particularly the thalamus, which acts as a central communication hub.
The film delves into split-brain surgery patients, whose corpus callosum (the connection between hemispheres) is severed. This separation reveals that the two brain hemispheres can function independently, each with its own awareness and control, leading to fascinating experiments where patients perceive and act on information without their verbal hemisphere being aware.
Our brains are constantly influenced by others and our environment. Neuroscientist Luke Chang's 'Trust Game' experiment shows how emotions like guilt, processed in the insula, and the regulative prefrontal cortex, guide social decision-making. The case of Phineas Gage, whose personality drastically changed after prefrontal cortex damage, highlights the brain's role in emotion and control.
Bianca Jones Marlin's research demonstrates how traumatic experiences can alter brain biology and be passed down through generations. Using mice, she shows how an association between smell and electric shock can lead to changes in gene expression and cellular responses that are inherited by offspring, suggesting a rapid form of evolutionary change.
Neuroscientist Uri Maoz uses magic tricks and TMS experiments to challenge our sense of agency. The experiments show that our perception of control can be manipulated, and that the feeling of agency is a constructive process involving feedback after an action. This suggests that our conscious control is more fragile and less absolute than we perceive.
Charles Limb's research on freestyle rappers reveals that during creative improvisation, the prefrontal cortex, linked to self-monitoring, deactivates. This suggests that letting go of conscious control can be crucial for creativity and optimal performance, as overthinking can hinder skills.
The documentary concludes that the brain is a complex collection of intricate parts, many operating unconsciously, that collectively create our perception of 'you.' While we often feel in charge, our brains are profoundly influenced by a multitude of factors, highlighting that conscious control is only part of the story. Understanding these unconscious processes can lead to greater self-awareness and a deeper understanding of what truly drives us.