A favorite topic in my family is the personality differences, psychological issues, behavioral traits, and other idiosyncracies among family members. In the immediate family and on both sides of the extended family, there are patterns that can be seen. Some of this might be genetic in origin, but no doubt there is much involving epigenetics, shared environmental conditions, parenting style, learned behavior, etc. Besides, nature and nurture are inseparable, in terms of actual people in the real world.
One example of a familial pattern is learning disabilities. I was diagnosed with learning disabilities when younger, but before my generation such diagnoses weren’t common. There appears to be some learning disabilities or rather learning style differences among some of my mother’s family. Another example is a dislike of physicality that was passed down from my paternal grandmother to my father and then to my older brother.
That latter one is interesting. My older brother has always been physically sensitive, like my dad. This to some extent goes along with an emotional sensitivity and, at least in the case of my brother, the physical sensitivity of allergies. His daughter has also taken on these psychological and physiological traits. All of these family members also have a hypersensitivity to social conditions, specifically in seeking positive responses from others.
I, on the other hand, have had an opposite cluster of factors. I was socially oblivious as a child and still maintain some degree of social indifference as an adult. My psychological and social insensitivity, although compensated for in other ways, goes hand in hand with a physical hardiness.
Unlike my paternal grandmother, father, brother, and niece, I am big-boned and more physical like my mother’s family. I even look more like my mother’s family with thicker hair, big feet, a bump on my nose, an underbite, and hazel eyes. About my physicality, it goes beyond just my body type, features, and activity level. I have such a high pain tolerance that I commonly don’t notice when I get a cut. I also don’t worry about cuts when I get them because I’m not prone to infections. I’ve always had a strong immune system and rarely get sick, but neither do I have an over-active immune system that leads to allergies.
All of this is the opposite of my older brother. He and his family are constantly getting sick, even as they constantly worry about germs and try to protect themselves. I played in filthy creeks as a child with exposed cuts and was far healthier than my cleanliness-obsessed brother who, when younger, panicked if his new shoes got scuffed.
It’s strange how these kinds of things tend to group together. It indicates a possible common cause or set of causes. That would likely be some particular combination of nature and nurture. I not only take more after my mother’s family for I also spent more time with my mother as a child than did my brothers, since she took time off from work when I was born (I was the third and last child, although fourth pregnancy following a miscarriage). My brothers didn’t get the same opportunity. So, I was also more likely to pick up behaviors from her. Between my brothers and I, only I am able to relate well with my mother. In particular, my older brother’s sensitivity is in constant conflict with my mother’s insensitivity. But I’m used to my mother’s way of relating, allowing me to better understand and sympathize, not to mention be more forgiving, partly because I share some of her tendencies.
Why is one kind of high sensitivity often related to other high sensitivities: emotional, social, pain, immune system, allergies, etc? And why is the opposite pattern seen with low sensitivities? What causes these clustered differences? And how can two such distinct clusters be found among siblings, sometimes even identical twins, who shared many factors?
It makes me curious.
It’s not just conditions like allergies and intolerances. There are similar clusters of neurocognitive, behavioral, and health conditions observed in various immune system disorders, the autism spectrum, fragile x syndrome, irritable bowel syndrome and other nutritional/dietary/intestinal issues, migraines, ADHD, toxoplasmosis and parasite load, heavy metal toxicity such as lead and mercury, etc. When there is one abnormal symptom or developmental issue, there are often others that show up at the same time or later on. This can involve such things as depression, anxiety, IQ, learning disabilities, irritability, impulse control issues, emotional instability, suicidal tendencies, accident proneness, etc along with more basic issues like asthma, diabetes, obesity, and much else.
In some cases, such as lead toxicity, the causal mechanisms are known as the toxin impacts every part of the body, especially the brain and nervous system. Or consider toxoplasmosis which apparently can alter the rates of personality traits in a population, along with differences in health consequences and social results, whatever is the exact chain of causation. But sometimes the correlations are far less clear and certain in their causal relationship. For example, what is the possible connection(s) between depressive tendencies, anger issues, addictive behaviors, learning difficulties, and physical hardiness among my maternal family?
There was a particular conversation that inspired this line of thought. My parents and I were discussing many of the above issues. But a major focus was on sleep patterns. My brother, like my dad, has a difficulty getting up and moving in the morning. They both tend to feel groggy when first waking up and prefer to remain physically inactive for a long period after. They also both find it hard to fall asleep and, in the case of my dad, a problem of waking up in the middle of the night. My mom and I, however, don’t have any of these issues. We fall asleep easily, typically stay asleep throughout the night, and wake up quickly. So, the difference between sensitivity and insensitivity impacts every aspect of life, even sleeping and waking.
Oftentimes, in our society, we blame individuals for the way they are. We act like people have a choice about how they feel and what motivates them. But it’s not as if because of moral superiority and strength of will that I’ve chosen to sleep well, have a strong immune system, feel physically energetic, and generally be insensitive. No more than I chose to have a learning disability and severe depression. It’s simply the way I’ve always been.
There is obviously much more going on here than mere genetics. And so genetic determinism is intellectually unsatisfying, even as some might find it personally convenient as a way of rationalizing differences. We have too much data proving environmental and epigenetic causes. A recent study could only find a few percentage of genes correlated to intelligence and, even then, they couldn’t prove a causal connection. The same thing is seen with so much other correlation research. The way various clusters form, as I argue, implies a complex web of factors that as of yet we don’t come close to understanding.
One intriguing connection that has been found is that between the brain and the gut. There are more neurons in the lining of the gastrointestinal system (the enteric nervous system) than in either the spinal cord or the peripheral nervous system. This is often called the “second brain,” but in evolutionary terms it was the earliest part of the brain. This is why there has been proven such a close relationship between intestinal health, diet, nutrition, microbiome, neurotransmitters, and mood. The human brain isn’t limited to the skull. The importance of this is demonstrated by introducing a new microbiome into the gut which can lead to physiological and pyschological changes.
Much else, however, remains a mystery. Seemingly minor changes in initial conditions, even epigenetic changes from prior generations, can lead to major changes in results. There can be a cascade of effects that follow. As I’ve previously stated, “This is because of the cumulative effect of initial conditions. One thing leads to another. Lowered nutrition or increased toxicity has its impact which gets magnified by such things as school tracking. Each effect becoming a cause and all the causal factors combining to form significant differences in end results.”
Later conditions can either lessen or exacerbate these results. Even epigenetics, by way of altered environmental conditions, can be switched back the opposite direction in a single generation with results that we know little about. Now consider the complexity of reality where there are millions of factors involved, with only a tiny fraction of those factors having been discovered and studied in scientific research. Those multitudinous factors act in combined ways that couldn’t be predicted by any single factor. All of this has to be kept in mind at the very moment in history when humans are ignorantly and carelessly throwing in further factors with unknown consequences such as the diversity of largely untested chemicals in our food and other products, not to mention large-scale environmental changes.
We don’t live at a society ruled by the precautionary principle. Instead, our collective ignorance makes us even more brazen in our actions and more indifferent to the results. The measured increase in certain physical and mental health conditions could be partly just an increase in diagnosis, but it’s more probable that at least some of the increase is actual. We are progressing in some ways as a society such as seen with the Moral Flynn Effect, but this is balanced by an Amoral Flynn Effect along with many other unintended consequences.
Along with this, our society has a lack of appreciation for the larger context such as historical legacies and a lack of respect for the power of larger forces such as environmental conditions. We are born into a world created by others, each generation forming a new layer upon the ground below. We are facing some tough issues here. And we aren’t prepared to deal with them.
As individuals, the consequences are laid upon our shoulders, without our realizing all that we have inherited and have had externalized onto our lives, as we grow up internalizing these realities and coming to identify with them. Each of us does the best we can with the hand we’ve been dealt, but in the process we get more praise and blame than we deserve. The individual, as the product of collective forces, is the ultimate scapegoat of society. The lives we find ourselves in are a confluence of currents and undercurrents, the interference pattern of waves. Yet, in our shared ignorance and incomprehension, we are simply who we are.
* * * *
The Ending of the Nature vs Nurture Debate
Heritability & Inheritance, Genetics & Epigenetics, Etc
What Genetics Does And Doesn’t Tell Us
Weak Evidence, Weak Argument: Race, IQ, Adoption
Identically Different: A Scientist Changes His Mind
What do we inherit? And from whom?
To Put the Rat Back in the Rat Park
Rationalizing the Rat Race, Imagining the Rat Park
Social Conditions of an Individual’s Condition
On Welfare: Poverty, Unemployment, Health, Etc
From Bad to Worse: Trends Across Generations
The Desperate Acting Desperately
It’s All Your Fault, You Fat Loser!
Facing Shared Trauma and Seeking Hope
Society: Precarious or Persistent?
Plowing the Furrows of the Mind
Union Membership, Free Labor, and the Legacy of Slavery.
Uncomfortable Questions About Ideology