A precise timing mechanism may underlie a common speech perception and production area in the peri-Sylvian cortex of the dominant hemisphere

A clinical rationale for assessing rapid automatized naming in children with language disorders

Three continuous rapid naming tasks (Semel, Wiig, & Secord, 1995) were administered to 2,450 American, English-speaking, academically achieving individuals with typical language development and intellectual ability (ages 6 to 21 years) and 136 individuals with primary language disorders (LD; ages 6, 7, 9, 11, 12, 15-16). Naming time in seconds differed significantly (p < .01) between the groups for color naming (Task 1) at age 12, shape naming (Task 2) at age 6, and color-shape naming (Task 3) at ages 6, 7, 9, and 12. Naming accuracy did not differ significantly (p > .01) between groups at the majority of the age levels compared. In the normative group, naming speed increased with age in a monotonic progression. The developmental trajectory in the LD group was essentially parallel, but elevated. The percentages of individuals who failed the naming-time criteria for Task 3 (color-shape naming) differed significantly in the two groups at all ages compared (p < .05). These findings indicate that the requirements for two-dimensional, continuous naming (Task 3 color-shape naming) resulted in reduced naming speed (longer total times) and interference with fluency in language production in about half of the clinical sample.

Cerebral organization of motor programming and verbal processing as a function of degree of hand preference and familial sinistrality

Seventy-six right- and left-handed subjects responded to monaurally presented verbal stimuli (CVs) using their right and left hands on separate occasions. Both degree of hand preference and familial sinistrality (FS) were taken into account. It was found that, contrary to expectation, the manual response interfered with the verbal perception task, but only in the consistent strong handers. The pattern of interference suggests that those with a consistent hand preference (right or left) have general motor programming in the left hemisphere. Those with an inconsistent strong hand preference probably have some degree of general motor programming in both hemispheres. No effect for FS was found for the lateralization of verbal processing or general motor programming.

The persistence of rapid naming problems in children with reading disabilities: a nine-year follow-up

In this study 9 children (6 boys, 3 girls) with reading disabilities and specific difficulties in rapid serial naming were followed from age 9 years to age 18 years. This group was taken from an earlier study sample of 82 third-grade children with learning disabilities. Tests of rapid serial naming, reading and spelling, general intelligence, articulation speed, and word fluency were administered to the subjects and to a matched control group (n = 10) in the initial study (at age 9) and in the present follow-up study (at age 18). The results showed that difficulties in both rapid naming and reading and spelling persisted into early adulthood in this subgroup. The development of naming speed is discussed in terms of a deficit model versus a developmental lag model of learning disability.