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The viewers of the movie in the scanner were both individuals with typical development and congenitally blind and congenitally deaf volunteers, who were presented with the audio play and the silent version of the movie, respectively. Credit: Neuroscience News

Decoding Emotions: Beyond Senses in the Human Brain

Summary: A new study explores how the human brain constructs emotions, regardless of sensory input.

By analyzing brain activity in individuals with and without sensory deprivations while they experienced the film 101 Dalmatians, researchers discovered that emotions are represented in the brain through an abstract coding system that transcends sensory modalities. This system involves a distributed network, including the ventromedial prefrontal cortex, which stores abstract representations of emotions.

The findings challenge traditional views on emotion and perception, suggesting that our emotional experiences are not solely dictated by our immediate sensory input but are instead constructed by the brain in a more abstract manner.

Key Facts:

  1. Abstract Emotion Coding: The study reveals that emotions are encoded in the brain abstractly, independent of sensory experiences.
  2. Cross-modal Emotional Representation: Individuals with congenital sensory deprivations, such as blindness or deafness, exhibit similar emotional brain responses to those with typical sensory development, highlighting a universal neural basis for emotions.
  3. Ventromedial Prefrontal Cortex Role: This brain area emerged as crucial for forming an abstract representation of emotions, indicating its significance in emotional processing beyond sensory input.

Source: IMT

How much do our emotions depend on our senses? Does our brain and body react in the same way when we hear a fearful scream, see an eerie shadow, or smell a sinister odor? And does hearing an upbeat music or seeing a colorful landascape bring the same joy?

In an innovative study published in Science Advances, researchers have unveiled new insights into the intricate relationship between emotion and perception.

Led by a team of Italian neuroscientists from the IMT School for Advanced Studies Lucca, and conducted in collaboration with the University of Turin, the research project investigates whether the brain employs sensory-specific or abstract codes to construct emotional experiences.

“Emotion and perception are deeply intertwined, yet the exact mechanisms by which the brain represents emotional instances have remained elusive,” says Giada Lettieri, researcher in psychology at the IMT School, and lead author of the study.

“Our research addresses this fundamental question, providing critical insights into how the brain organizes and represents emotional information across different sensory modalities and as a result of past sensory experience.”

To conduct the study, the researchers showed the movie 101 Dalmatians to a group of 50 volunteers, and tracked with functional magnetic resonance imaging the brain activity associated with the unfolding of the movie plot.

The viewers of the movie in the scanner were both individuals with typical development and congenitally blind and congenitally deaf volunteers, who were presented with the audio play and the silent version of the movie, respectively.

The researchers also asked a group of 124 independent participants to express and rate their emotions while watching the same movie outside the scanner, trying to predict the brain response of people with and without sensory deprivation during the experience of amusement, fear, and sadness, among other emotions.

“Including in the experiment individuals with congenital sensory deprivation – blind and deaf people – is a way to dissect and decipher the contribution of sensory experience to neural mechanisms underlying emotions” explains Luca Cecchetti, researcher at the IMT School, and senior author and supervisor of the study.

“Our results show that emotions categories are represented in the brain regardless of sensory experience and modalities. In particular, there is a distributed network encompassing sensory, prefrontal, and temporal areas of the brain, which collectively encode emotional instances.

“Of note, the ventromedial prefrontal cortex emerged as a key locus for storing an abstract representation of emotions, which does not depend on prior sensory experience or modality.”

The existence of an abstract coding of emotions in the brain signifies that even though we are tempted to believe that our emotions directly depend on what happens in the surrounding world, it is our brain that is wired to generate emotional meaning regardless of whether we are able to see or hear.

“In a world where sensory-deprived individuals are frequently overlooked, it is essential to understand how mental faculties and their corresponding neural representations can evolve and refine without sensory input, so to further advance the understanding of the emotion and the human brain,” says Lettieri.

About this neuroscience and emotion research news

Author: Chiara Palmerini
Source: IMT
Contact: Chiara Palmerini – IMT
Image: The image is credited to Neuroscience News

Original Research: The findings will appear in Science Advances

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