Specific Learning Disorders (SLDs) denote a category
of neurodevelopmental disorders. It is initially crucial to distinguish the
term learning difficulty from the term specific learning disorder. The former
refers to any school difficulty that can be modified with targeted
interventions, the latter term implies the presence of a more severe and innate
deficit, and is the result of a diagnostic process. By Specific we define
processes concerning the need to learn generally automatic activities. By
Learning we indicate those processes that increase a given ability due to
experience and external social context. In Italy, with the publication of Law
170/2010 [6], a Consensus Conference was held in Rome on December 6 and 7,
2010, which showed that specific learning disorders affect about 3 percent of
Italian pupils. These disorders are neurobiological in origin; they interfere
with the normal process of acquiring reading, writing and/or calculation.
Environmental and social factors, such as school and family context, are
intertwined with neurobiological ones and contribute to determining the
disorder and the degree of maladjustment. The international diagnostic manuals that
define ASD are the ICD- 111 in which ASDs are classified within
neurodevelopmental disorders. The DSM 5 [7] in which ASDs are framed
dimensionally as disorders of reading, written expression and computation.
The disorders, involve a specific skill domain, global
intellectual functioning remains intact, they are called "specific"
in that, based on the skill involved they take on a specific connotation thus
classified by their respective codes in the ICD - 10 diagnostic manual:
- F81.0 Specific reading
disorder,
- F81.1 Specific arithmetic
skills disorder,
- F81.2 Specific spelling
disorder.
In the DSM - V diagnostic manual the disorder codes as
follows:
- 315.00 Specific learning
disorder with impairment of reading,
- 315.1 Specific learning
disorder with impairment of computation,
- 315.2 Specific learning
disorder with impairment of written expression.
Following the publication of the DSM - V (APA, 2014).
Three levels of severity of ASDs were introduced:
- Mild
level by which is meant a simple adaptation of teaching to the needs of the
student.
- Moderate
level which is the most frequent condition with marked difficulties that need
help or support,
- Severe
level in which difficulties are evidenced with insufficient learning despite
compensatory tools.
The diagnostic guidelines in the area of ASDs provide
five basic criteria to be met: First criterion: there must be a clinically
significant degree of impairment of the specific skill, second criterion: the
impairment must be specific, in the sense that it must not be attributable only
to a mental retardation, third criterion: the impairment must be developmental,
it must be present in the early years of schooling and not acquired later as a
result of, for example, cerebral palsy, fourth criterion: there must be no
external factors capable of explaining the schooling difficulties, such as a
family trauma, fifth criterion: the impairment must not be directly due to
uncorrected defects in vision or hearing. At the Italian level, the Consensus
Conference in January 2007 in its Recommendations indicated as a crucial
element for the identification of DSAs the criterion of the
"discrepancy" between ability of the specific domain concerned
(deficient in relation to expectations by age and/or class attended) and
general intelligence (appropriate to chronological age) [8]. From a standpoint
of causes and period of onset, dyslexia can be divided into: acquired or
developmental [7]. Acquired dyslexia refers to those reading disorders that
arise as a consequence of brain damage, in individuals in whom reading skills
were originally in the normal range. In contrast, developmental dyslexia is a
specific disorder that inhibits the normal process of reading acquisition that
may be associated with a simple slowing of the developmental process.
The procedures needed to define specific reading
decoding disorder reported by the Consensus Conference are:
- The administration of
standardized tests that examine reading, obtaining results related to accuracy
and speed in reading words, non-words and passage
- The joint evaluation of
the parameters of speed and accuracy in performance
- The detection of a
significant distance from the expected mean values for the class attended by
the child in at least one of the two parameters rapidity or accuracy.
The minimum age at which a diagnosis of specific
reading disorder can be made coincides with the completion of the second grade
of elementary school.
In DSM V5 [7] the guidance for making diagnoses of
dyslexia indicates that these criteria must be met:
- The level achieved in
reading is substantially below what is expected based on the subject's
chronological age, psychometric assessment of intelligence, and age-appropriate
instruction;
- The disorder described
significantly interferes with learning school and/or with activities that
require reading skills;
- If a sensory deficit is
present, the reading difficulties must go beyond those usually associated with
the sensory deficit in question.
In summary, normal variations in reading skills should
be differentiated from dyslexia, which can be diagnosed only if the individual
has been provided with adequate educational and cultural opportunities, if his
or her IQ is average, and if he or she has no sensory deficits that can alone
explain reading problems. In the dyslexic student, difficulties are not only
related to working memory (retaining and retrieving information), but also to
limitations related to lexical access, that is, the inability to remember the
name of an object or a place. If short-term memory is impaired, information is
lost even before it is processed.
Dysorthography and Dysgraphia Specific writing
disorder is divided into Dysorthography and Dysgraphia, depending on whether it
affects spelling or handwriting.
Dysorthography is the difficulty in translating
corresponding sounds into graphic signs, while possessing adequate language in
terms of lexical pronunciation and expressive skills. Thus, the same errors are
manifested at the spelling level that dyslexia presents in reading.
Dysorthographia concerns the use, when writing, of the
correct application of grammatical rules [7].
The term dysgraphia, that is, the difficulty in making
graphic gestures, refers to a disturbance in the process of transforming
phonemes into graphemes; the dysgraphic person has messy, unclear handwriting
accompanied by a difficulty in mastering drawing tools. Therefore, using spaces
correctly or orienting the writing of the paper may represent a discomfort.
Individuals with specific writing disorder, fearful of
being judged for the errors they might make, avoid using complex terms or
elaborate sentences, making their writing meager and poor in vocabulary.
For diagnostic assessment, it is necessary to
administer standardized tests; specifically, for dysorthographia, the
assessment parameter of correctness, consisting of the number of errors and
their percentile distribution, below the fifth percentile is shared, while for
dysgraphia, it seems to be a consequence of motor execution disorders of the
dyspraxic order.
According
to ICD -10 and DSM V to make a diagnosis of Written Expression Disorder, these
criteria must be met:
- Writing ability, as
measured by individually administered standardized tests (or a functional
assessment of writing ability), is lower than expected based on the subject's
chronological age, psychometric assessment of intelligence, and age-appropriate
education;
- Written expression
abnormality significantly interferes with school learning or daily activities
that require writing skills.