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| Learning Disability |
Causes of Learning Disabilities
Mental health professionals put emphasis on the fact that no one knows what causes learning disabilities; it doesn't help parents to look backward to search for possible reasons. There are too many possibilities to pin down the cause of the disability with certainty. It is far more important for the family to move forward in finding ways to get the right help.
Once, scientists thought that all learning disabilities were caused by a single neurological problem. But research has helped us see that the causes are more diverse and complex. New evidence seems to show that most learning disabilities do not stem from a single, specific area of the brain, but from difficulties in bringing together information from various brain regions. Scientists, however, do need to study causes in an effort to identify ways to prevent learning disabilities.
Today, a leading theory is that learning disabilities originate from perplexing disturbances in brain structures and functions. Some scientists believe that, in many cases, the disturbance begins before birth.
Risk factors for learning and developmental problems fall into two categories:
• Genetic
• Environmental
Genetic Factors
The fact that learning disabilities tend to run in families indicates that there may be a genetic link. For example, children who lack some of the skills needed for reading, such as hearing the separate sounds of words, are likely to have a parent with a related problem. However, a parent's learning disability may take a slightly different form in the child. A parent who has a writing disorder may have a child with an expressive language disorder. For this reason, it seems unlikely that specific learning disorders are inherited directly. Possibly, what is inherited is a complex brain dysfunction that can in turn lead to a learning disability.
A person can inherit abnormal brain structure or function. Although a person may seem to have inherited a learning disability, the environment can still make a difference. For instance, a child with a learning disability who is raised in a good learning environment will have a better outcome than a child brought up in a poor learning environment.
There may be an alternative explanation for why learning disabilities might appear to run in families. Some learning difficulties may actually originate from the family environment. For example, parents who have expressive language disorders might talk less to their children or the language they use may be distorted. In such cases, the child lacks a good model for acquiring language and therefore, may seem to be learning disabled.
Children are placed at genetic risk by being born with a genetic or chromosomal abnormality. A good example of a genetic risk is Down syndrome, a disorder that causes developmental delay because of an abnormal chromosome.
Before birth or during delivery
The genetic relationship is very important for healthy brain development in the fetus. Negative influences on brain development in the uterus and at birth are:
• the mother’s drug-use, alcohol-use, or smoking during pregnancy
• physical problems during pregnancy or delivery (e.g. Oxygen deprivation)
• very low birth weight
• premature birth
• birth trauma or distress
• the mother’s poor nutrition
During delivery, the umbilical cord may become twisted and temporarily cut off oxygen to the fetus. This, too, can impair brain functions and lead to a learning disability
Toxins in the Child's Environment
Environmental risk results from exposure to harmful agents either before or after birth, and can include things like poor maternal nutrition or exposure to toxins (e.g. Lead or drugs) or infections that are passed from a mother to her baby during pregnancy (e.g., measles or HIV). Environmental risk also includes a child's life experiences. For example, children who are born prematurely, face severe poverty, mother's depression, poor nutrition, or lack of care are at increased risk for developmental delays.
New brain cells and the natural language process continue to be produced for a year or so after the child is born. These cells are vulnerable to certain disruptions as well. Researchers are looking into environmental toxins that may lead to learning disabilities, possibly by disrupting childhood brain development or brain processes.
Cadmium (a metallic element) and lead, both prevalent in the environment, are becoming a leading focus of neurological research. Cadmium, used in making some steel products, can get into the soil, then into the foods we eat. Lead was once common in paint and gasoline, and is still present in some water pipes. A study of animals sponsored by the National Institutes of Health showed a connection between exposure to lead and learning difficulties. In the study, rats exposed to lead experienced changes in their brainwaves, slowing their ability to learn. The learning problems lasted for weeks, long after the rats were no longer exposed to lead.
In addition, there is growing evidence that learning problems may develop in children with cancer who had been treated with chemotherapy or radiation at an early age.
Tobacco, Alcohol, and Other Drug Use
Many drugs taken by the mother pass directly to the fetus. Research shows that a mother's use of cigarettes, alcohol, or other drugs during pregnancy may have damaging effects on the unborn child. Therefore, to prevent potential harm to developing babies, the U.S. Public Health Service supports efforts to make people aware of the possible dangers of smoking, drinking, and using drugs.
Scientists have found that mothers who smoke during pregnancy may be more likely to bear smaller babies. This is a concern because small newborns, usually those weighing less than 5 pounds, tend to be at risk for a variety of problems, including learning disorders.
Alcohol also may be dangerous to the fetus' developing brain. It appears that alcohol may distort the developing neurons. Heavy alcohol use during pregnancy has been linked to fetal alcohol syndrome, a condition that can lead to low birth weigh, intellectual impairment, hyperactivity, and certain physical defects. Any alcohol use during pregnancy, however, may influence the child's development and lead to problems with learning, attention, memory, or problem solving. Because scientists have not yet identified "safe" levels, alcohol should be used cautiously by women who are pregnant or who may soon become pregnant.
Drugs such as Cocaine
Cocaine especially the smokable form known as crack seem to affect the normal development of brain receptors. These brain cell parts help to transmit incoming signals from our skin, eyes, and ears, and help regulate our physical response to the environment. Because children with certain learning disabilities have difficulty understanding speech sounds or letters, some researchers believe that learning disabilities, as well as ADHD, may be related to faulty receptors. Current research points to drug abuse as a possible cause of receptor damage.
There are several general "warning signs" of possible delay. These include:
Behavioral Warning Signs
• Does not pay attention or stay focused on an activity for as long a time as other children of the same age
• Focuses on unusual objects for long periods of time; enjoys this more than interacting with others
• Avoids or rarely makes eye contact with others
• Gets unusually frustrated when trying to do simple tasks that most children of the same age can do
• Shows aggressive behaviors and acting out and appears to be very stubborn compared with other children
• Displays violent behaviors on a daily basis
• Stares into space, rocks body, or talks to self more often than other children of the same age
• Does not seek love and approval from a caregiver or parent
Vision Warning Signs
• Seems to have difficulty following objects or people with her eyes
• Rubs eyes frequently
• Turns, tilts or holds head in a strained or unusual position when trying to look at an object
• Seems to have difficulty finding or picking up small objects dropped on the floor (after the age of 12 months)
• Has difficulty focusing or making eye contact
• Closes one eye when trying to look at distant objects
• Eyes appear to be crossed or turned
• Brings objects too close to eyes to see
• One or both eyes appear abnormal in size or coloring
Hearing Warning Signs
• Talks in a very loud or very soft voice
• Seems to have difficulty responding when called from across the room, even when it is for something interesting
• Turns body so that the same ear is always turned toward sound
• Has difficulty understanding what has been said or following directions after 3 years of age
• Doesn't startle to loud noises
• Ears appear small or deformed
• Fails to develop sounds or words that would be appropriate at her age
In addition, because children usually acquire developmental milestones or skills during a specific time frame or "window", is used to predict when most children will learn different skills. If a child is not learning a skill that other children the same age are learning, that may be a "warning sign" that the child may be at risk for developmental delay.
If a child has not mastered skills during a specific time frame, it does not mean your child is delayed. It’s best that you let your child's doctor know about your concerns and actively monitor your child’s progress. The child may also benefit from a developmental screening or assessment.
How Developmental Delays are Identified
Developmental delay is identified through two types of play-based assessments:
• Developmental Screening
• Developmental Evaluation
A developmental screening test is a quick and general measurement of skills. Its purpose is to identify children who are in need of further evaluation. A screening test can be in one of two formats, either a questionnaire that is handed to a parent or childcare provider that asks about developmental milestones or a test that is given to your child by a health or educational professional.
A screening test is only meant to identify children who might have a problem. The screening test may either over-identify or under-identify children with delay. As a result, a diagnosis cannot be made simply by using a screening test. If the results of a screening test suggest a child may have a developmental delay, the child should be referred for a developmental evaluation.
A developmental evaluation is a long, in-depth assessment of a child's skills and should be administered by a highly trained professional, such as a Special Educator or Psychologist. Evaluation tests are used to create a profile of a child's strengths and weaknesses in all developmental areas. The results of a developmental evaluation are used to determine if the child is in need of early intervention services and/or an Individual Education Program Plan (IEP).
At times, when a child has a delay in one area (i.e. Speech), it can affect other developmental areas such as social or emotional. Therefore, it is crucial that a child receive intervention as soon as possible.
Mental health professionals put emphasis on the fact that no one knows what causes learning disabilities; it doesn't help parents to look backward to search for possible reasons. There are too many possibilities to pin down the cause of the disability with certainty. It is far more important for the family to move forward in finding ways to get the right help.
Once, scientists thought that all learning disabilities were caused by a single neurological problem. But research has helped us see that the causes are more diverse and complex. New evidence seems to show that most learning disabilities do not stem from a single, specific area of the brain, but from difficulties in bringing together information from various brain regions. Scientists, however, do need to study causes in an effort to identify ways to prevent learning disabilities.
Today, a leading theory is that learning disabilities originate from perplexing disturbances in brain structures and functions. Some scientists believe that, in many cases, the disturbance begins before birth.
Risk factors for learning and developmental problems fall into two categories:
• Genetic
• Environmental
Genetic Factors
The fact that learning disabilities tend to run in families indicates that there may be a genetic link. For example, children who lack some of the skills needed for reading, such as hearing the separate sounds of words, are likely to have a parent with a related problem. However, a parent's learning disability may take a slightly different form in the child. A parent who has a writing disorder may have a child with an expressive language disorder. For this reason, it seems unlikely that specific learning disorders are inherited directly. Possibly, what is inherited is a complex brain dysfunction that can in turn lead to a learning disability.
A person can inherit abnormal brain structure or function. Although a person may seem to have inherited a learning disability, the environment can still make a difference. For instance, a child with a learning disability who is raised in a good learning environment will have a better outcome than a child brought up in a poor learning environment.
There may be an alternative explanation for why learning disabilities might appear to run in families. Some learning difficulties may actually originate from the family environment. For example, parents who have expressive language disorders might talk less to their children or the language they use may be distorted. In such cases, the child lacks a good model for acquiring language and therefore, may seem to be learning disabled.
Children are placed at genetic risk by being born with a genetic or chromosomal abnormality. A good example of a genetic risk is Down syndrome, a disorder that causes developmental delay because of an abnormal chromosome.
Before birth or during delivery
The genetic relationship is very important for healthy brain development in the fetus. Negative influences on brain development in the uterus and at birth are:
• the mother’s drug-use, alcohol-use, or smoking during pregnancy
• physical problems during pregnancy or delivery (e.g. Oxygen deprivation)
• very low birth weight
• premature birth
• birth trauma or distress
• the mother’s poor nutrition
During delivery, the umbilical cord may become twisted and temporarily cut off oxygen to the fetus. This, too, can impair brain functions and lead to a learning disability
Toxins in the Child's Environment
Environmental risk results from exposure to harmful agents either before or after birth, and can include things like poor maternal nutrition or exposure to toxins (e.g. Lead or drugs) or infections that are passed from a mother to her baby during pregnancy (e.g., measles or HIV). Environmental risk also includes a child's life experiences. For example, children who are born prematurely, face severe poverty, mother's depression, poor nutrition, or lack of care are at increased risk for developmental delays.
New brain cells and the natural language process continue to be produced for a year or so after the child is born. These cells are vulnerable to certain disruptions as well. Researchers are looking into environmental toxins that may lead to learning disabilities, possibly by disrupting childhood brain development or brain processes.
Cadmium (a metallic element) and lead, both prevalent in the environment, are becoming a leading focus of neurological research. Cadmium, used in making some steel products, can get into the soil, then into the foods we eat. Lead was once common in paint and gasoline, and is still present in some water pipes. A study of animals sponsored by the National Institutes of Health showed a connection between exposure to lead and learning difficulties. In the study, rats exposed to lead experienced changes in their brainwaves, slowing their ability to learn. The learning problems lasted for weeks, long after the rats were no longer exposed to lead.
In addition, there is growing evidence that learning problems may develop in children with cancer who had been treated with chemotherapy or radiation at an early age.
Tobacco, Alcohol, and Other Drug Use
Many drugs taken by the mother pass directly to the fetus. Research shows that a mother's use of cigarettes, alcohol, or other drugs during pregnancy may have damaging effects on the unborn child. Therefore, to prevent potential harm to developing babies, the U.S. Public Health Service supports efforts to make people aware of the possible dangers of smoking, drinking, and using drugs.
Scientists have found that mothers who smoke during pregnancy may be more likely to bear smaller babies. This is a concern because small newborns, usually those weighing less than 5 pounds, tend to be at risk for a variety of problems, including learning disorders.
Alcohol also may be dangerous to the fetus' developing brain. It appears that alcohol may distort the developing neurons. Heavy alcohol use during pregnancy has been linked to fetal alcohol syndrome, a condition that can lead to low birth weigh, intellectual impairment, hyperactivity, and certain physical defects. Any alcohol use during pregnancy, however, may influence the child's development and lead to problems with learning, attention, memory, or problem solving. Because scientists have not yet identified "safe" levels, alcohol should be used cautiously by women who are pregnant or who may soon become pregnant.
Drugs such as Cocaine
Cocaine especially the smokable form known as crack seem to affect the normal development of brain receptors. These brain cell parts help to transmit incoming signals from our skin, eyes, and ears, and help regulate our physical response to the environment. Because children with certain learning disabilities have difficulty understanding speech sounds or letters, some researchers believe that learning disabilities, as well as ADHD, may be related to faulty receptors. Current research points to drug abuse as a possible cause of receptor damage.
There are several general "warning signs" of possible delay. These include:
Behavioral Warning Signs
• Does not pay attention or stay focused on an activity for as long a time as other children of the same age
• Focuses on unusual objects for long periods of time; enjoys this more than interacting with others
• Avoids or rarely makes eye contact with others
• Gets unusually frustrated when trying to do simple tasks that most children of the same age can do
• Shows aggressive behaviors and acting out and appears to be very stubborn compared with other children
• Displays violent behaviors on a daily basis
• Stares into space, rocks body, or talks to self more often than other children of the same age
• Does not seek love and approval from a caregiver or parent
Vision Warning Signs
• Seems to have difficulty following objects or people with her eyes
• Rubs eyes frequently
• Turns, tilts or holds head in a strained or unusual position when trying to look at an object
• Seems to have difficulty finding or picking up small objects dropped on the floor (after the age of 12 months)
• Has difficulty focusing or making eye contact
• Closes one eye when trying to look at distant objects
• Eyes appear to be crossed or turned
• Brings objects too close to eyes to see
• One or both eyes appear abnormal in size or coloring
Hearing Warning Signs
• Talks in a very loud or very soft voice
• Seems to have difficulty responding when called from across the room, even when it is for something interesting
• Turns body so that the same ear is always turned toward sound
• Has difficulty understanding what has been said or following directions after 3 years of age
• Doesn't startle to loud noises
• Ears appear small or deformed
• Fails to develop sounds or words that would be appropriate at her age
In addition, because children usually acquire developmental milestones or skills during a specific time frame or "window", is used to predict when most children will learn different skills. If a child is not learning a skill that other children the same age are learning, that may be a "warning sign" that the child may be at risk for developmental delay.
If a child has not mastered skills during a specific time frame, it does not mean your child is delayed. It’s best that you let your child's doctor know about your concerns and actively monitor your child’s progress. The child may also benefit from a developmental screening or assessment.
How Developmental Delays are Identified
Developmental delay is identified through two types of play-based assessments:
• Developmental Screening
• Developmental Evaluation
A developmental screening test is a quick and general measurement of skills. Its purpose is to identify children who are in need of further evaluation. A screening test can be in one of two formats, either a questionnaire that is handed to a parent or childcare provider that asks about developmental milestones or a test that is given to your child by a health or educational professional.
A screening test is only meant to identify children who might have a problem. The screening test may either over-identify or under-identify children with delay. As a result, a diagnosis cannot be made simply by using a screening test. If the results of a screening test suggest a child may have a developmental delay, the child should be referred for a developmental evaluation.
A developmental evaluation is a long, in-depth assessment of a child's skills and should be administered by a highly trained professional, such as a Special Educator or Psychologist. Evaluation tests are used to create a profile of a child's strengths and weaknesses in all developmental areas. The results of a developmental evaluation are used to determine if the child is in need of early intervention services and/or an Individual Education Program Plan (IEP).
At times, when a child has a delay in one area (i.e. Speech), it can affect other developmental areas such as social or emotional. Therefore, it is crucial that a child receive intervention as soon as possible.
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