Presents experiments with a straight line seen for a short stimulus time in which the subjects perceived the line to lengthen from the point of fixation and then to shorten to the point of fixation immediately thereafter. (MB)

The purpose of this study was to analyze fear extinction and reinstatement in humans using fear-potentiated startle. Participants were fear conditioned using a simple discrimination procedure with colored lights as the conditioned stimuli (CSs) and an airblast to the throat as the unconditioned stimulus (US). Participants were extinguished 24 h…

Errorless learning refers to a variety of discrimination learning techniques that eliminate or minimize responding to incorrect choices. This article describes experimental roots of errorless learning and applied errorless strategies. Specifically, previous research on stimulus fading, stimulus shaping, response prevention, delayed prompting,…

Research supported by U.S. Office of Education contract OE-6-8934.

Research was conducted on two selective attention systems in learning situations. The theoretical and experimental approaches are presented in a set of six papers. One paper considered directions in attention theory and five papers report experiments with pigeon and children subjects. The two attention systems are (1) coding response, which…

This study assessed the effect of different novelty pairings and reward sequences on the exploratory behavior in successive discrimination learning problems of 60 preschool children from a Head Start program. (BRT)

An infant control habituation-recovery procedure was used to study 3-month-old infants' discrimination of sad, happy, and surprise facial expressions. (Author/JMB)

Reports three experiments conducted to investigate factors controlling performance of nonreinforced verbal imitation. (WY)