Report of a Work Group on Nonverbal Learning Disability: Consensus Criteria for Developmental Visual-Spatial Disorder, a Reconceptualization of Nonverbal Learning Disability for DSM Consideration.

Objective: Although extant research points to NonVerbal Learning Disability (NVLD) as a distinct disorder, it is not included in the diagnostic nomenclatures, and there is heterogeneity in how it is defined. We formed a working group to gain consensus on a standard DSM type definition for NVLD, a necessary first step for proposing its inclusion in future DSMs and renamed the disorder to better reflect the core deficit - visual-spatial problems.

Method: An iterative process was used to reach consensus on a DSM style criteria set that reconceptualizes NVLD as Developmental Visual-Spatial Disorder (DVSD).

Longitudinal cognitive performance of participants with sporadic early onset Alzheimer's disease from LEADS.

Introduction: Early-onset Alzheimer's disease (EOAD) manifests prior to the age of 65, and affects 4%-8% of patients with Alzheimer's disease (AD). The current analyses sought to examine longitudinal cognitive trajectories of participants with early-onset dementia.

Methods: Data from 307 cognitively normal (CN) volunteer participants and those with amyloid-positive EOAD or amyloid-negative cognitive impairment (EOnonAD) were compared.

Differences in baseline cognitive performance between participants with early-onset and late-onset Alzheimer's disease: Comparison of LEADS and ADNI.

Introduction: Early-onset Alzheimer's disease (EOAD) and late-onset Alzheimer's disease (LOAD) share similar amyloid etiology, but evidence from smaller-scale studies suggests that they manifest differently clinically. Current analyses sought to contrast the cognitive profiles of EOAD and LOAD.

Methods: Z-score cognitive-domain composites for 311 amyloid-positive sporadic EOAD and 314 amyloid-positive LOAD participants were calculated from baseline data from age-appropriate control cohorts.