Comorbidity between reading disability and math disability: concurrent psychopathology, functional impairment, and...

Area of Science:

• Neuropsychology
• Developmental Psychology
• Educational Psychology

Background:

• Reading disability (RD) and math disability (MD) frequently co-occur, but their shared etiology remains unclear.
• Understanding the underlying neuropsychological factors is crucial for effective intervention strategies.

Purpose of the Study:

• To investigate the neuropsychological underpinnings of the comorbidity between RD and MD.
• To differentiate shared and unique cognitive deficits associated with isolated and comorbid RD and MD.

Main Methods:

• Compared neuropsychological performance across groups with RD only, MD only, RD + MD, and controls.
• Utilized multiple regression analyses to identify predictors of reading and math deficits.

Main Results:

• Groups with RD, MD, and comorbid RD + MD showed significant impairments compared to controls.
• The RD + MD group exhibited greater impairment in internalizing psychopathology, academic functioning, and several neuropsychological constructs.
• Shared weaknesses in working memory, processing speed, and verbal comprehension were linked to both RD and MD.

Conclusions:

• RD and MD are distinct yet related disorders, with comorbidity explained by shared neuropsychological deficits.
• Unique deficits in phoneme awareness and naming speed are associated with RD, while set-shifting difficulties are linked to MD.
• Findings support multiple-deficit neuropsychological models for understanding RD and MD.