Being a neuroscientist comes with a unique occupational hazard of existential anxiety. The more we uncover about perception, cognition, decision-making, and behavioral selection, the more we are faced with the realization that it’s all mechanical. Everything we think of as heart-driven decisions may simply be the result of a machine’s workings.
How can we claim to choose when the process is just a collection of mechanical cogs turning? Who truly bears responsibility?
Modern technology allows us to witness these metaphorical gears in motion. By tracking neural activity in different circuits and brain regions through neuroimaging tools, we can understand the cognitive operations behind decision-making and behavior.
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Patterns of neural activity can correspond with evidence accumulation, certainty levels, confidence, goal adoption, rewards, learning, emotional signals, habit formation, and real-time behavioral adjustments. It’s like witnessing thought in action.
In some cases, we can even predict behavior onset before an individual acts. Research setups using rodents or monkeys reveal brain activity patterns anticipating behavior thresholds and even predicting future actions.
Experiments with humans, like those by Benjamin Libet in the 1980s, have shown brain activity leading movement occurring before conscious awareness of the decision. These findings challenge the notion that our conscious mind controls behavior, suggesting a more complex underlying mechanism.
External intervention in neural mechanisms can influence behavior patterns. Studies with patients undergoing brain surgery by Wilder Penfield showed how stimulating different brain areas can evoke sensations, emotions, memories, and movements, highlighting the intricate control system within us.
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Optogenetics in animals enables researchers to activate specific neurons and study real-time behavior effects. Understanding the cognitive mechanisms behind actions, memories, decision-making, and options weighing provides a deeper insight into behavior control.
This shift towards understanding the brain as an essential part of the decision-making process challenges our perception of choice and control. As we delve deeper into the neural mechanics, we question the concept of free will and autonomy.
Excerpt from FREE AGENTS: HOW EVOLUTION GAVE US FREE WILL. Copyright © 2023 Kevin Mitchell. Reprinted with permission of Princeton University Press.
Read the full interview with Kevin Mitchell here Instant genius. Bite-sized masterclasses in podcast format by the BBC Science Focus team.
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Source: www.sciencefocus.com
