Sensory and working memory in a spatial change-detection task by pigeons and humans.

Judgements of items viewed less than 100 ms prior are predominantly supported by a sensory, or iconic, memory system. Iconic memory is of high-capacity, but is also volatile and limited in duration. Judgements after longer delays increasingly rely on a working memory system, which is lower in capacity and volatility than sensory memory, but is longer in duration.

The Role of Patient Payment Method in Premature Discharge from Methadone Maintenance Treatment.

Background: Premature discharge is a pervasive problem in methadone maintenance treatment (MMT), and is associated with numerous adverse outcomes. Although a number of demographic variables have consistently been found to impact MMT retention, method of payment has received considerably less attention. A notable limitation of prior work is that most studies classify all patients who leave treatment early, irrespective of reason, as treatment dropouts and fail to account for specific reasons.

The influence of landmark stability on control by occasion setters.

In an operant serial feature-positive procedure, an occasion setter (OS) signals that a response will be reinforced in the presence of a second stimulus (e.g., a discriminative stimulus, A).