In this study, 24 individuals (ages 6-37) with down syndrome had to learn a symbolic conditional discrimination task. Participants showed better terminal accuracy and faster learning of the task when the alternative correct responses were each followed by unique different outcomes than when nondifferential outcomes were arranged. (Contains…

Two five-year-old children with profound hearing impairments were involved in a conditional discrimination task. They were taught to relate manual signs, pictures, and printed words in a nominal matching-to-sample task in such a way that equivalent stimuli resulted. Results showed that the establishment of equivalence relations can promote…

Three papers--comments, a reply to comments, and a rejoinder--discussing a conclusion about the nature of general intelligence based on the size loadings of a psychomotor test of discrimination reaction time are presented. The use of Spearman's "g" is the center of the controversy. (TJH)

Two experiments examined whether 40 infants would reenact what an adult did or intended to do: (1) infants observed an adult unsuccessfully attempt to complete 4 target acts; and (2) children observed a mechanical device tracing the adults' actions. Infants could infer adults' intentions and imitate target acts, suggesting that children can…

This study, which assessed hypothesis-testing abilities using a discrimination-learning paradigm, found that 16 language-impaired primary-level children solved fewer problems than 16 controls equated on cognitive level, but the 2 groups used similar hypothesis types to solve the problems. Type of verbal feedback (explicit versus nonexplicit) did…

This case study describes initially unsuccessful attempts to use the delayed-cue procedure to teach conditional discriminations to a 25-year-old male with moderate mental retardation. The subject typically waited for the delayed cue unless differential responses to the dictated samples (repeating the sample names) were required. (Author/DB)

Forty-four boys and 23 girls aged 3 to 6 years attending preschools serving mostly middle class populations participated in a nonreversal discrimination task with gender typing and size of stimulus the relevant target dimensions. Results support predictions based on gender schema theory regarding salience of gender-to-gender schematic and…

A correction procedure, including interruption, physical guidance, verbal instruction, and repetition, was used to train five students with severe/profound mental retardation to reject unmatching referents to their gesture mands. Trainers are urged to assess student response when items not matching the referent of a prior request are offered.…

Results of numerous human imaging studies and nonhuman neurophysiological studies on "reward" highlight a role for frontal, striatal, and thalamic regions in operant learning. By integrating operant and functional neuroimaging methodologies, the present investigation examined brain activation to two types of discriminative stimuli correlated with…

The neural mechanisms of fear suppression most commonly are studied through the use of extinction, a behavioral procedure in which a feared stimulus (i.e., one previously paired with shock) is nonreinforced repeatedly, leading to a reduction or elimination of the fear response. Although extinction is perhaps the most convenient index of fear…

A model of conditional discrimination performance (Davison & Nevin, 1999) is combined with the notion that unmeasured attending to the sample and comparison stimuli, in the steady state and during disruption, depends on reinforcement in the same way as predicted for overt free-operant responding by behavioral momentum theory (Nevin & Grace, 2000).…

Ten hearing impaired college students and 10 normal hearing students were given receptive speech discrimination tests in English, French, and Spanish. No significant differences between English and foreign language discrimination scores were found for the normal hearing Ss. The hearing impaired Ss had significantly lower discrimination scores for…

A method for measuring recognition memory (free of distractors) and false recognition was based on the assumption that the subject was "honest." A distractor-free test of word recognition (a single-item test trial in which the 36 targets were presented prior to the 36 distractors) was compared with a traditional target-distractor…