"Where does anger come from?"
Haru murmured.
"From the mind, right?" Ren answered immediately.
"But your heart pounds and your face gets hot. Isn't the body first?"
Ren pondered. "The James-Lange theory."
"What's that?"
"A theory that emotions are the result of bodily reactions. We don't cry because we're sad, we're sad because we cry."
Haru was surprised. "That's backwards."
"It might be backwards. There are experiments showing that running and raising your heart rate makes you more prone to anxiety."
"The body creates emotions?"
Ren drew a diagram in his notebook. "But the Cannon-Bard theory makes a different claim."
"What kind?"
"Emotions and bodily reactions occur simultaneously. The brain's thalamus sends signals to both."
Haru was confused. "So which is correct?"
"Both might be partially correct," Ren answered carefully. "Emotions are complex."
"Complex how?"
"Cognitive appraisal is also involved. The same heart rate increase feels different during a marathon versus before an exam."
Haru understood. "The interpretation of the situation determines the emotion?"
"Schachter-Singer's two-factor theory. A combination of physiological arousal and cognitive labeling."
"Labeling?"
"If you interpret it as 'this is a scary situation,' it's fear. If 'this is a fun situation,' it's excitement."
Haru laughed. "Are emotions post-hoc explanations?"
"In a sense. But that's not all."
Ren looked out the window. "Emotions have evolutionary functions."
"Functions?"
"Fear helps avoid danger, anger helps counter threats, joy helps reward learning."
"So emotions are for survival?"
"Some evolutionary psychologists think so. But human emotions are more complex."
Haru asked. "Are animal and human emotions different?"
"A matter of degree. Humans can subdivide emotions with language. 'Sadness' and 'loneliness' are different."
"Language creates emotions?"
Ren nodded. "The linguistic relativity hypothesis. Language potentially shapes thought and emotion."
"So emotions without words don't exist?"
"They might exist, but are harder to recognize."
Haru took a deep breath. "The origin of emotions isn't just one thing."
"Body, brain, cognition, culture, evolution, all intertwined."
"Philosophically speaking?"
Ren answered carefully. "It's part of the mind-body problem. The relationship between the physical body and subjective experience."
"Like qualia?"
"Yes. Like the sensation of 'redness,' the 'feeling of anger' is also hard to explain."
Haru laughed. "So basically, we don't know?"
"Not completely. But we can understand it from multiple angles."
"Multiple angles?"
"Neuroscience measures brain activity. Psychology observes behavior. Philosophy analyzes concepts."
Haru opened her notebook. "So where do emotions originate?"
Ren answered. "Depends on how you frame the question. Physical origin is the brain. Experiential origin is consciousness. Evolutionary origin is survival strategy."
"All correct?"
"Just different levels. Different levels of explanation."
Haru looked at the window. "Even now as I feel emotions, things are happening at various levels."
"The body reacts, the brain processes, consciousness experiences."
"But what I feel is one 'emotion.'"
Ren smiled. "The mystery of integration. Separate processes become one subjective experience."
"Strange."
"That's the hard problem of consciousness. There's an explanatory gap."
Haru stood up. "The origin of emotions, still so mysterious."
"That's why it's interesting," Ren admitted. "We can't even fully understand our own emotions."
"But continuing to think about it has meaning?"
"It does. Self-understanding leads to a better life."
They quietly began to walk. The journey to find the origin of emotions has just begun.