Learning Disabilities
Children with this disorder may have trouble controlling their rate of speech. Or they may lag behind playmates in learning to make speech sounds. Developmental articulation disorders are common. They appear in at least 10 percent of children younger than age 8. Fortunately, articulation disorders are often outgrown or successfully treated with speech therapy.
Developmental Expressive Language Disorder
Some children with language impairments have problems expressing them selves in speech. Their disorder is called, therefore, a developmental expressive language disorder. This disorder can take many forms. For example, a 4-year-old who speaks only in two-word phrases and a 6-year-old who can't answer simple questions have an expressive language disorder.
Developmental Receptive Language Disorder
Some people have trouble understanding certain aspects of speech. There's a toddler who doesn't respond to his name, a preschooler who hands you a bell when you asked for a ball, or a worker who consistently can't follow simple directions. Their hearing is fine, but they can't make sense of certain sounds, words, or sentences they hear. They may even seem inattentive. These people have a receptive language disorder. Because using and understanding speech are strongly related, many people with receptive language disorders also have an expressive language disability. [Of course, in preschoolers, some misuse of sounds, words, or grammar is a normal part of learning to speak. It's only when these problems persist that there is any cause for concern.]
Students with academic skills disorders are often years behind their classmates in developing reading, writing, or arithmetic skills. The diagnoses in this category include:
Developmental reading disorder
Developmental writing disorder
Developmental arithmetic disorder
Developmental Reading Disorder
This type of disorder, also known as dyslexia, is quite widespread. In fact, reading disabilities affect 2 to 8 percent of elementary school children. When you think of what is involved in the "three R's" -reading, 'riting, and 'rithmetic- it's astounding that most of us do learn them. Consider that to read, you must simultaneously:
Focus attention on the printed marks and control eye movements across the page
Recognize the sounds associated with letters
Understand words and grammar
Build ideas and images
Compare new ideas to what you already know
Store ideas in memory
Writing too, involves several brain areas and functions. The brain networks for vocabulary, grammar, hand movement, and memory must all be in good working order. So, a developmental writing disorder may result from problems in any of these areas. For example, a child with a writing disability, particularly an expressive language disorder, might be unable to compose complete, grammatical sentences.
Developmental Arithmetic Disorder
Arithmetic involves recognizing numbers and symbols, memorizing facts, aligning numbers, and understanding abstract concepts like place value and fractions. Any of these may be difficult for children with developmental arithmetic disorders, also called dyscalculia. Problems with number or basic concepts are likely to show up early. Disabilities that appear in the later grades are more often tied to problems in reasoning.
Many aspects of speaking, listening, reading, writing, and arithmetic overlap and build on the same brain capabilities. So, it's not surprising that people can be diagnosed as having more than one area of learning disability. For example, the ability to understand language underlies learning to speak.Therefore, any disorder that hinders the ability to understand language will also interferewith the development of speech, which in turn hinders learning to read and write. A single gap in the brain's operation can disrupt many types of activity.