In re: Valentine's Day: Love (& Fear) Are Whole-brain Activities

Happy Valentine's Day, aka, Ash Wednesday, the day we traditionally clean out the fire place after having burned the Yule Log and a few of Santa's Elves, if not the jolly old Elf himself.  In doing so, we honor a fourth century Christian martyr who was either beheaded, burned at the stake, crucified or simply ignored to death (depending on which version you believe) for having performed weddings against the express wishes of the Roman Emperor.  Sheesh, what a grouch.

So, as we experience another blatantly commercial holiday designed to impoverish us all and our descendants unto the Nth generation, here's a neat bit of info about love.

Enjoy.  Happy V.D.

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Love and fear are visible across the brain

instead of being restricted to any brain region

In the field of affective neuroscience, rivalling theories debate whether emotional states can be regarded as an activity of only certain brain regions. According to a new doctoral dissertation at Aalto University, an emotional state affects the operation of the entire brain instead of individual emotions being localised only in specific regions in the brain.

'From the biological point of view, an emotion is a state of the entire brain at a given moment. For example, the brain may interpret certain action models, memories and bodily changes altogether as anger,' explains Doctoral Candidate Heini Saarimäki.

Credit: Heini Saarimäki

An emotional state mainly activates wide, overlapping neural networks. When comparing groups

of emotions, positive emotions activate the anterior prefrontal cortex, negative basic emotions tend

to activate the somatomotor and subcortical regions, and negative social emotions activate brain

areas that process motor and social information.

Different emotional states of the participants were evoked with films, mental imagery or guided imagery based on narratives. After that, a classifier algorithm based on machine learning was trained to connect the specific emotions and the brain data related to them. The classifier algorithm was then tested by giving it new brain data and by measuring how successfully the algorithm recognised the correct emotion solely on the basis of the brain data. The method for measuring brain activity is based on measuring the changes in the blood oxygen content in the brain and it provides information on the activation of the brain with millimetre-accuracy.

The researchers were particularly interested in emotion-specific brain maps, that is, maps on the localisation of emotions in various areas across the entire brain. By analysing the activity of the entire brain, a machine learning algorithm may be able to determine the emotional state in question.

Saarimäki and her colleagues discovered that the brain maps of basic emotions such as anger, happiness, sadness, fear, surprise and disgust were to some extent similar across people. Basic emotions seem to be at least partially biologically determined, whereas social emotions -- gratitude, contempt, pride and shame -- are to a greater extent built on experience. In social emotions, the differences in brain activity between people are greater than in basic emotions.

From groups of similar emotions to the power of empathy
The classifier algorithm makes more mistakes with distinguishing emotions that have similar brain maps than with emotions whose brain maps have little in common. This information can be further compared to how people interpret certain emotions subjectively. Positive emotions, such as happiness, love, gratitude and pride, are more similar both as subjective experiences and at the level of brain activity. Negative emotions, such as fear, anger and sadness, on the other hand, have as a group a similar basis in brain activity. The brain activities during negative social emotions such as shame, guilt and contempt, in turn, resemble each other most but differ from the brain maps of basic negative emotions.

'We also discovered that the accuracy of emotion classification seems to be related to individual differences in emotional processing, such as in the ability to feel empathy. We want to examine in more detail how individual differences, for example in empathy, are linked to the functioning of the emotional systems of the brain. A separate research project investigating this is about to begin,' Saarimäki explains.

The results of the study benefit the treatment of mental health disorders or memory loss diseases, which both appear to be clearly connected to emotional disorders. A better understanding of the brain mechanisms of different emotions may be helpful in planning and targeting treatment correctly.

Story Source:  Materials provided by Aalto University. "Love and fear are visible across the brain instead of being restricted to any brain region." ScienceDaily. 14 February 2018.