Higher moral reasoning equates to increased grey matter in the brain
on 04 June 2015
moral reasoning

A solid case for improving our moral code and we become nicer people too! It seems that high levels of moral reasoning correspond with increased grey matter in the brain!

Get yourself a fulfilling philosophy!

Having a sound moral base eventually becomes a habit that influences our behaviour. Life is mostly a numbers game, i.e. the greater the number of synaptic connections one has, the better. That is especially so if they connect to things that make the world a better place. Hence, a philosophy that involves things that equate to good moral standing, e.g. honesty, integrity, compassion, kindness and more, the better the brain will work. The reason for this is that these attributes are largely involved in positive emotions and better outcomes. This leads to a more balanced life, complete with less conflict. Consequently, our lives become more functional and this creates an environment that stimulates neuroplasticity and neurogenesis. The very stuff of more grey matter and more neuro-communication.

The Research:
Individuals with a higher level of moral reasoning skills showed increased grey matter in the areas of the brain implicated in complex social behaviour, decision making, and conflict processing as compared to subjects at a lower level of moral reasoning, according to new research from the Perelman School of Medicine and the Wharton School of the University of Pennsylvania in collaboration with a researcher from Charité Universitätsmediz in Berlin, Germany. The team studied students in the Masters of Business Administration (MBA) program at the Wharton School. The work is published in the June 3rd edition of the journal PLOS ONE.

Moral development research pioneered by psychologist Lawrence Kohlberg in the mid-20th century shows that people progress through different stages of moral reasoning as their cognitive abilities mature. Neuroscience has recently reinvigorated moral psychology by introducing new methods for studying moral decision-making. However, no study to date has quantified brain structures supporting individual stages of moral reasoning.

"To investigate this question, we employed a sample of MBA students ages 24 to 33, past the age at which structural brain maturation is complete, and tested their moral reasoning, then looked at the level of grey matter in the brains of a subset of subjects," said senior author Hengyi Rao, PhD, a research assistant professor of Cognitive Neuroimaging in Neurology and Psychiatry in the Perelman School of Medicine.

"MBA students were ideal candidates for this work, as the Wharton curriculum addresses issues of moral decision-making and reasoning," explained Diana Robertson, PhD, a professor of legal studies and business ethics at the Wharton School and an author of the study. "We aimed to investigate whether the stage of moral reasoning is reflected in structural brain architecture."

A total of 67 MBA students were administered the Defining Issue Test to determine which pattern of thought or behaviour, known as cognitive schema, each student used when reasoning about moral issues. In it, students were presented with complex moral dilemmas such as medically assisted suicide and asked to choose the relevance of each of the 12 given rationales. Based on the results, subjects were then assigned to one of seven schema types that represent increasing levels of moral development. Students then underwent MRI scanning to investigate differences in grey matter volume between students who reached the post-conventional level of moral reasoning compared to those who have not reached that level yet.

Subjects also underwent personality testing and were placed into one of the following categories: neuroticism, extraversion, openness to experience, conscientiousness, and agreeableness. The analysis showed higher scores in openness to experience and lower scores in neuroticism for participants at the more advanced levels of moral development.

With regard to the brain structure, the team observed increased grey matter in the prefrontal cortex in subjects who reached the post-conventional level of moral reasoning compared to those who are still at a pre-conventional and conventional level. In other words, grey matter volume was correlated with the subject's degree of post-conventional thinking.

"This research adds an investigation of individual differences in moral reasoning to the expanding landscape of moral neuroscience," Rao said. "The current findings provide initial evidence for brain structural difference based on the stages of moral reasoning proposed by Lawrence Kohlberg decades ago. However, further research will be needed to determine whether these changes are the cause or the effect of higher levels of moral reasoning."

Story Source:
The above story is based on materials provided by the Perelman School of Medicine at the University of Pennsylvania. Note: Materials may be edited for content and length.


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