Category-Based Effect on False Memory of People with Down Syndrome

Area of Science:

• Cognitive Psychology
• Developmental Psychology
• Linguistics

Background:

• Individuals with Down syndrome (DS) have documented verbal memory deficits and relatively preserved visuospatial skills.
• Their receptive language abilities, though better than expressive, significantly lag behind peers, potentially impairing semantic integration.
• Semantic knowledge is closely linked to verbal memory, making its integration a critical area for investigation in DS.

Purpose of the Study:

• To investigate the semantic integration abilities of individuals with Down syndrome (DS) using false-memory paradigms.
• To explore potential differences in false memory formation between nouns and verbs in people with DS.
• To compare semantic processing in individuals with DS against typically developing control groups (MA and CA).

Main Methods:

• A two-phase false-memory task involving word list presentation and subsequent recognition judgments.
• Presentation of semantically related associates, semantically related lures, and semantically unrelated new words.
• Analysis of accuracy and response times across different word types and participant groups.

Main Results:

• Individuals with DS demonstrated lower overall accuracy in word recognition compared to control groups.
• People with DS showed impaired recognition of lures and unrelated words, indicating difficulties with semantic discrimination.
• While overall recognition of associates was similar to MA controls, it was less accurate than CA controls, with distinct patterns observed in noun vs. verb processing.

Conclusions:

• People with DS exhibit a mixed pattern of semantic integration, with delays in processing associates and increased susceptibility to lures and unrelated words.
• Distinct processing patterns for nouns and verbs suggest category-specific differences in false memory formation in DS.
• The findings indicate a deviant semantic structure in individuals with DS, impacting language and social cognition, and support category-based rehabilitation approaches.