Nine low-functioning children with profound expressive language impairment and autism were studied in terms of their responsiveness to a computer-based learning program designed to assess syntactic awareness. The children learned to touch words on a screen in the correct sequence in order to see a corresponding animation, such as 'monkey flies'. The game progressed in levels from 2 to 4 word sequences, contingent upon success at each stage. Although performance was highly variable across participants, a detailed review of their learning profiles suggested that no child lacked syntactic awareness and that elementary syntactic control in a non-speech domain was superior to that manifest in their spoken language. The reasons for production failures at the level of speech in children with autism are discussed.
Private speech utterances (PS) from 24 preschool children and 24 adults were obtained under (noninteracting) listener present and listener absent conditions using 2 tasks with an identical structure. Children produced significantly more PS in the listener present condition. Similar results were obtained with adults, albeit with a reduced incidence of private speech. The children's PS was further subdivided into 4 main categories: task irrelevant, task relevant general, task relevant focused, and incoherent mutterings. The last 2 of these categories accounted for 75% of PS in the absent condition, offering a more conservative coding of speech that could be regarded truly "private," i.e., only for "self." This subset of utterances, however, was still significantly more prevalent in the listener present condition. The results are interpreted as showing a social motive in talking out loud during problem solving and are considered in terms of a reappraisal of what is implied by the term "private speech."
We explore a long‐observed phenomenon in children's cognitive development known as size seriation. It is not until children are around 7 years of age that they spontaneously use a strict ascending or descending order of magnitude to organize sets of objects differing in size. Incomplete and inaccurate ordering shown by younger children has been thought to be related to their incomplete grasp of the mathematical concept of a unit. Piaget first brought attention to children's difficulties in solving ordering and size‐matching tests, but his tasks and explanations have been progressively neglected due to major theoretical shifts in scholarship on developmental cognition. A cogent alternative to his account has never emerged, leaving size seriation and related abilities as an unexplained case of discontinuity in mental growth. In this monograph, we use a new training methodology, together with computational modeling of the data to offer a new explanation of size seriation development and the emergence of related skills. We describe a connected set of touchscreen tasks that measure the abilities of 5‐ and 7‐year‐old children to (a) learn a linear size sequence of five or seven items and (b) identify unique (unit) values within those same sets, such as second biggest and middle‐sized. Older children required little or no training to succeed in the sequencing tasks, whereas younger children evinced trial‐and‐error performance. Marked age differences were found on ordinal identification tasks using matching‐to‐sample and other methods. Confirming Piaget's findings, these tasks generated learning data with which to develop a computational model of the change. Using variables to represent working and long‐term memory (WM and LTM), the computational model represents the information processing of the younger child in terms of a perception‐action feedback loop, resulting in a heuristic for achieving a correct sequence. To explain why older children do not require training on the size task, it was hypothesized that an increase in WM to a certain threshold level provides the information‐processing capacity to allow the participant to start to detect a minimum interval between each item in the selection. The probabilistic heuristic is thus thought to be replaced during a transitional stage by a serial algorithm that guarantees success. The minimum interval discovery has the effect of controlling search for the next item in a principled monotonic direction. Through a minor additional processing step, this algorithm permits relatively easy identification of ordinal values. The model was tested by simulating the perceptual learning and action selection processes thought to be taking place during trial‐and‐error sequencing. Error distributions were generated across each item in the sequence and these were found to correspond to the error patterns shown by 5‐year‐olds. The algorithm that is thought to emerge from successful learning was also tested. It simulated high levels of success on seriation and also on ordinal identif...
Perceptual processing in autism is associated with both 'strengths' and 'weaknesses' but within a literature that varies widely in terms of the assessments used. We report data from 12 children with autism spectrum disorders (ASD) and 12 age and IQ matched neurotypical controls tested on a set of tasks using the same stimuli throughout but systematically changing in difficulty. These tasks ranged through simple detection of stimulus onset to pairwise size discrimination across two approaching targets. Children with ASD were slower than controls even in simple detection tasks, but this did not explain further group differences found in the size discrimination of approaching targets. The results are discussed in terms of impairments in speed of responding in ASD under certain conditions of visuomotor coupling, stimulus presentation and increased information processing demands.
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