"I wonder where the mind is."
Haru said while placing a hand on their chest.
"In the brain," Ren answered immediately.
"But it feels like it's here," Haru pointed to their chest.
Mio said quietly. "That's metaphor."
"Metaphor?"
"Feeling emotions in the chest is due to bodily reactions," Ren explained. "Because your heart pounds, you mistake it for the heart."
"But actually, the brain's amygdala reacts and sends signals to the heart."
Haru said unconvincingly. "So the mind is the brain?"
"In modern neuroscience, yes."
Mio spoke. "But there's a hard problem."
"Hard problem?"
Ren began explaining. "The mind-body problem. Chalmers' 'hard problem.'"
"The relationship between brain activity and conscious experience."
Haru was confused. "Doesn't brain activity create consciousness?"
"The causal relationship is understood. But why subjective experience arises isn't known."
Mio quietly added. "The experience of seeing red. That's different from physical phenomena."
"Qualia."
"Qualia?" Haru asked.
Ren explained. "Subjective quality. The experience of 'redness' itself."
"Whether that can be explained physically is the hard problem."
Haru thought. "So the mind isn't physical?"
"From the dualist position," Ren said. "Descartes thought mind and body are separate substances."
"Dualism of matter and spirit."
Mio said quietly. "But how do they interact."
"That's the problem. How do the material brain and immaterial mind influence each other?"
Haru held their head. "Difficult."
Ren continued. "So many philosophers take monism."
"Monism?"
"Physicalism, that everything is matter. Or idealism, that everything is mind."
Mio added. "Or neutral monism, which is neither."
Haru asked. "Which is correct?"
"Still unknown," Ren admitted.
Mio said quietly. "But in daily life, we feel dualistic."
"Yes. The sense that our mind exists separately from our body."
Haru nodded. "The body changes, but the mind feels the same."
Ren said philosophically. "That connects to the problem of personal identity."
"Me ten years ago and me now are physically completely different. Cells have been replaced."
"But I feel like the same 'me.'"
Mio nodded deeply. "Continuity is created by memory and consciousness."
"Because the mind is felt as the core of self."
Haru raised another question. "So is the mind throughout the whole brain? Or in a specific place?"
"It's considered distributed," Ren answered. "Memory in hippocampus, emotion in amygdala, judgment in frontal lobe."
"Each function integrates to become the mind."
Mio said quietly. "But the mechanism of integration is also mysterious."
"The binding problem."
Haru pondered. "The mind is nowhere and everywhere?"
"Poetic, but might be accurate," Ren acknowledged.
Mio smiled. "The mind is not a place, but a process."
"Brain activity patterns. Flow of information."
Ren supplemented. "So the question 'where' might not be appropriate in the first place."
"The mind is not 'what' but 'how.'"
Haru took a deep breath. "Difficult, but interesting."
"Thinking about unanswerable questions is itself the mind's work."
Mio said quietly. "The mind questions itself."
The three fell silent. The mysterious phenomenon called mind is happening here now.