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Douyon P Neuroplasticity Your brains superpower zzard Ink Publishing |
Panksepp J December The riddle of laughter neural and psychoevolutionary |
underpinnings of joy Current Directions in Psychological Science |
Chapter Optimal Quality of Life Training |
Gleitman H Fridlund A J Reisberg D Psychology th ed W W Norton |
and Company |
Lorenz K On aggression Methuen Publishing de Waal F The bonobo and |
the atheist In search of humanism among the primates WW Norton Company |
PROGRAM PEACE Self Care Exercises to Reprogram Your Mind and Body |
Chapter Persistent Adaptation to Chronic Stress |
Being defeated is often a temporary condition Giving up is what makes it permanent Marilyn vos Savant |
b |
Our Bodies Compensate in Response to Suboptimal Environments |
Although our bodies are capable of finding peace they were never designed to do so Rather |
they developed to internalize environmental hardship to ensure the perpetuation of our genes |
Harmful experiences cause organisms to promptly deviate from otherwise optimal body plans |
restricting growth and mobility while reducing their quality of life The focus of this chapter is to |
explain why we retain stress in the form of bodily trauma |
From microorganisms to monkeys all life forms respond to stressors with innate biological |
programs They are prepared to alter their bodies and life strategies if they encounter adverse |
environments To be clear this is a form of nonmutational adaptation that takes place without |
natural selection during an individuals lifetime We all have the potential to become highly |
stressadapted and this could happen to you in a matter of weeks if you were exposed to |
extreme hardship The DNA genotype does not change however the genes that are |
expressed change and cause the body phenotype to change Your genes specify the blueprint |
and the foundation but the environmental circumstances influence how soundly your structure |
is built |
The changes bodies make allow conformation to occasional but regularly recurring |
environmental pressures faced by the species These are usually stressors Changes can be |
either transient or permanent and are examples of a scientific concept called developmental |
plasticity How you responded plastically to your environment results in a unique |
developmental trajectory For instance if you were a sad child growing up you are more likely |
to be a melancholy adult Certain developmental windows close early in life but we retain a |
great deal of plasticity even in old age This means that your fundamental nature dominant |
submissive calm anxious etc is in the process of being determined even as you read this |
Developmental plasticity is any change in the body good or bad mediated by changes in |
gene expression as a response to the environment When say gene expression am referring |
to the process where the bodys cells determine that a particular protein is needed they find |
the gene that encodes the protein from within the DNA in the cells nucleus and use it to build |
the protein For example when you exercise consistently genes that encode the proteins |
needed for muscle tissue become highly expressed resulting in muscle growth Thats a clear |
case of developmental plasticity your body responds to exercise by building new muscle to |
make the lifting easier |
The same thing happens on a faster scale when your eyes adapt to darkness Cells in the |
retina use the rhodopsin gene to build the rhodopsin protein necessary to see better in low |
light The production of breast milk involves expressing milk proteins within the breast tissue |
that are not expressed before pregnancy Tanning involves the production of the protein |
pigment melanin The formation of longterm memories neuroplasticity involves physical |
changes to brain cells that necessitate protein expression Each of the genes in the |
PROGRAM PEACE Self Care Exercises to Reprogram Your Mind and Body |
human genome codes for a protein that performs a specific function within our bodies when |
needed Some of these genes and their proteins contribute to anxiety |
The Tradeoffs of Adapting to Adversity |
Simple singlecell organisms respond to stress excessive heat starvation and abrupt chemical |
changes in their environment by tweaking their body plan Molecular cues that they pick up |
cause them to express genes that may otherwise remain dormant causing changes within their |
cell walls to respond to the demands at hand Even in the simplest organisms like bacteria and |
protists these emergency alterations have costs Resources are funneled toward responding to |
the crisis rather than to longevity and upkeep Over time this negatively affects the health of |
the microbe |
Humans also make unhealthy changes in response to bad environments Constant muscle |
strain incites protein expression that changes the muscle making it hard inflexible and limiting |
its range of motion Shallow breathing becomes persistent because the body uses gene |
expression to retune the breathing apparatus to become maximally efficient at shallow |
breathing The heart is similarly retuned to beat rapidly Threatsensing areas of the brain are |
reinforced after threatening experiences Stress stimulates the expression of a large variety of |
different proteins in organs throughout the body and brain that would not otherwise be |
expressed These proteins are used in defensive structures defensive maneuvers and the |
creation of a defensive mind state The effects of developmental plasticity can be lifelong or |
even multigenerational Recent findings have found that many of the negative effects can be |
reversed but the longer you wait the harder it will be |
These changes might be useful for instance if your environment is filled with predators |
But they can produce drastic bodily changes especially if they are triggered early in |
development This is easiest to see in nonhuman examples like certain species of horned |
beetle The beetles body type can vary sharply based on food availability Visually the two |
versions look very different Even many scientists at first assumed these two morphs were from |
different species When they dont have enough food developing males become smaller and |
weaker and never develop their characteristic horns Their metabolism is reduced and they |
utilize sneaky reproductive tactics rather than the direct combat typical of their betterfed |
peers This morph is adaptiveit has better reproductive successbut only in environments |
where food is scarce and larger beetles cannot feed themselves Outside those environments |
a hornless horned beetle has no real chance to compete |
A similar thing happens to the water flea Daphnia If exposed to the smell of their natural |
predators early in life they develop a large protective covering that helps them resist being |
eaten However this armor also makes it harder to move and feed These examples of plasticity |
involve fundamental tradeoffs The same kinds of responses occur in mammals although the |
effects are usually less obvious Still sometimes you can visually recognize the ravages of stress |
in people who are extremely anxious highly traumatized drugaddicted or on the bottom of |
the social totem pole What these people share in common is that their stress system has been |
turned up too high for too long For the beetle the environmental cue predictive of adversity is |
malnutrition For the flea it is the smell of its natural predator Can you guess what ours is It is |
distressed breathing Shallow thoracic breathing drives the threat system and a cascade of |
harmful cellular modifications that change our physical body plan |
Chapter Persistent Adaptation to Chronic Stress |
Ze yo |
va Qa VA |
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illustration A Horned beetle and smaller hornless beetle B Water fleas with and without protective armoring |
How Mammals Adapt to Chronic Stress |
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