Assessment of progressively delayed prompts on guided skill learning in rats.

We examined the controlling factors that allow a prompted skill to become autonomous in a discrete-trials implementation of Touchette's (1971) progressively delayed prompting procedure, but our subjects were rats rather than children with disabilities. Our prompted skill was a left-right lever-press sequence guided by two panel lights. We manipulated (a) the effectiveness of the guiding lights prompt and (b) the presence or absence of a progressively delayed prompt in four groups of rats. The less effective prompt yielded greater autonomy than the more effective prompt. The ability of the progressively delayed prompt procedure to produce behavioral autonomy depended upon characteristics of the obtained delay (trial duration) rather than on the pending prompt. Sequence accuracy was reliably higher in unprompted trials than in prompted trials, and this difference was maintained in the 2 groups that received no prompts but yielded equivalent trial durations. Overall sequence accuracy decreased systematically as trial duration increased. Shorter trials and their greater accuracy were correlated with higher overall reinforcement rates for faster responding. Waiting for delayed prompts (even if no actual prompt was provided) was associated with lower overall reinforcement rate by decreasing accuracy and by lengthening trials. These findings extend results from previous studies regarding the controlling factors in delayed prompting procedures applied to children with disabilities.

Epithelial vulvar neoplasms and their changing classification.

In recent years, there have been many changes in the classification scheme for squamous lesions of the vulva; this is primarily due to the assimilation of new scientific information into the diagnostic terminology. For example, over the past 75 years we have realized that precancerous and cancerous lesions of the vulva may be induced by a variety of preconditions, which are typically divided into human papillomavirus (HPV) and non-HPV precursor lesions. The latter include several dermatoses, especially lichen sclerosus and lichen planus. Additionally, we have learned that HPV on extramucosal and nongenital sites does not have the same malignant potential as on mucosal or genital sites. Because of the frequent changes in nomenclature due to these discoveries, both old and new terms continue to be used in clinical practice; a summary of these terms is provided to help prevent a misunderstanding of their scope and significance. Important points for clinicians and pathologists who are involved in the care of these patients are provided.