On Monday, I attended the third lecture of “The Brain and Its Mysteries” by Ethan Newnham, a talented neuroscience student at U3A Box Hill. Ethan’s presentation on Free Will was engaging and thought-provoking, offering deep insights into the enigmatic workings of the human brain and challenging our understanding of free will.
The lecture began with a discussion on free will, prompting us to consider our own definitions of this concept. Ethan described free will as the ability to act based solely on our conscious decisions, a notion that seemed intuitive yet difficult to articulate. He highlighted that our decisions might be influenced by factors we aren’t immediately aware of, such as genetic variations like the Dopamine Receptor D4 (DRD4) gene, which can predispose individuals to risk-taking behaviors, and MHC genes, which can influence partner choice through pheromones.
Ethan then introduced a powerful case study involving a brain tumor in the left frontal lobe, illustrating how such conditions can drastically alter personality and behavior without the individual’s conscious awareness. This case underscored the profound impact that physical changes in the brain can have on our decision-making processes, far beyond the influence of individual genes.
The most striking part of the lecture was the discussion of the Libet Experiment, which utilized EEG technology to monitor brain activity. Ethan explained that the experiment showed a buildup of electrical activity in the motor cortex before participants consciously decided to press a button, suggesting that our brains might initiate actions before we become consciously aware of our decisions. This finding challenges the traditional view of free will, portraying the brain as a complex system influenced by preceding events much like weather patterns or traffic flows.
Ethan further delved into the implications of these findings, discussing how our understanding of free will, or the lack thereof, could impact our justice system. He posited that a justice system without the concept of free will would focus more on prevention and rehabilitation rather than retribution, similar to how society’s view of epilepsy has evolved from punishment to medical treatment.
The lecture concluded on a contemplative note, with Ethan acknowledging the complexity of these issues and the difficulty in applying them to everyday life. He humorously ended by stating that while he believes life is beautiful, he cannot dictate actions based on this belief, leaving us to ponder our own conclusions and actions.
Overall, Ethan’s presentation was another enlightening exploration of the brain’s mysteries, providing a nuanced perspective on free will and its implications. His ability to convey complex scientific concepts in an accessible and engaging manner made the lecture both informative and enjoyable.
The presentation slides are available in the course resources.