A comparison of generalization functions and frame of reference effects in different training paradigms

Six experiments were carried out to compare go/no-go and choice paradigms for studying the effects of intradimensional discrimination training on subsequent measures of stimulus generalization in human subjects. Specifically, the purpose was to compare the two paradigms as means of investigating generalization gradient forms and frame of reference effects. In Experiment 1, the stimulus dimension was visual intensity (brightness); in Experiment 2, it was line orientation (line-angle stimuli). After learning to respond (or to respond “right”) to stimulus value (SV) 4 and not to respond (or to respond “left”) to SV2 (in Experiment 1) or SV1 (in Experiment 2), the subjects were tested for generalization (recognition) with an asymmetrical set of values ranging from SV1 to SV11. Go/no-go training produced peaked gradients, whereas choice training produced sigmoid gradients. The asymmetrical testing resulted in a gradual shift of the peak of responding (go/no-go group) or in the point of subjective indifference (PSI; choice group) toward. the central value of the test series; thus, both paradigms revealed a frame of reference effect. The results were comparable for the quantitative (intensity) and the qualitative (line-angle) stimulus dimensions. Experiment 3 compared the go/no-go procedure with a yes/no procedure in which subjects responded “right” to SV4 and “left” to all other intensities and found no differences between these procedures. Thus the difference in gradient forms in go/no as opposed to (traditional) choice paradigms depends on whether one or two target stimuli are used in training. In Experiment 4, in which visual intensity was used, the shift in the PSI following choice training varied positively with the range of asymmetrical test stimuli employed. In Experiment 5, also with visual intensity, the magnitude of the peak shift following go/no-go training varied as a function of over representing a high or a low stimulus value during generalization testing. Experiment 6, with line angles, showed that the PSI following choice training varies in a similar way. The frame of reference effects obtained in these experiments are consistent with an adaptation-level model.     

Competitive Climates,Athletic Skill,and Children's Status in After-School Recreational Sports Programs

Relationships among competition, athletic skill, and social relationships among children have received considerable attention from social psychologists and have also sparked considerable public debate. Most studies of these relationships have concentrated on sports programs involving upper elementary or older boys. This field work study examined these relationships in three after-school recreation programs for children ages 5 to 8. Although all programs professed to stress skills development over competition, teams act varied substantially in competitive climates. Competitive environments heightened the tendency for athletic skill to function as a generalized status element in peer networks. After-school sports programs contributed to the reproduction of athletic skill as a basis of peer status, even for young children.     

DOES FUNCTIONAL COMMUNICATION TRAINING COMPETE WITH ONGOING CONTINGENCIES OF REINFORCEMENT? AN ANALYSIS DURING RESPONSE ACQUISITION AND MAINTENANCE

We examined the effectiveness of functional communication training (FCT) in reducing self-injurious behavior (SIB) and in shaping an alternative (communicative) response while SIB continued to be reinforced. Following a functional analysis of 3 individuals' SIB, we attempted to teach an alternative response consisting of a manual sign to each individual, using the reinforcer that maintained SIB. When FCT was implemented without extinction, SIB remained at baseline rates for all participants, and none of the participants acquired the alternative response. When extinction was added to the training procedure, SIB decreased and manual signing increased for all participants. To determine if signing, when established, would compete with SIB when both were reinforced, extinction was then withdrawn. Signing was maintained and SIB occurred at low rates for 2 individuals, but SIB returned to baseline rates for the 3rd individual, necessitating the reimplementation of extinction. These results suggest that it may be difficult to establish alternative behaviors if inappropriate behavior continues to be reinforced, but that, when established, alternative behavior might compete successfully with ongoing contingencies of reinforcement for inappropriate behavior.     

A PRELIMINARY ANALYSIS OF INTERACTIVE EFFECTS BETWEEN COMMON CLASSROOM CONTINGENCIES AND METHYLPHENIDATE

To assess the drug—behavior interaction effects with an 8-year-old boy with attention deficit hyperactivity disorder, common classroom antecedent (e.g., seating arrangement) and consequent (e.g., peer prompts) stimuli were alternated within a school day while drug conditions (methylphenidate vs. placebo) were alternated across days. The results suggested that peer attention maintained disruptive behavior when methylphenidate was absent but not when it was present.     

Attitudes Toward “Gays in the Military”: A Functional Perspective1

The functions associated with attitudes toward gays in the military were investigated. In Study I, secondary analyses of data compiled by the Gallup Organization indicated that ego-defensive and value-expressive functions are associated with attitudes toward lifting the ban on homosexuals in the military. In Study 2, results from a questionnaire specifically designed to assess reasons to lift or keep the ban replicated the findings of Study 1. In addition, Study 2 indicated that the functions both uniquely contribute to the prediction of attitudinal stance. Results from both studies indicated that approval of lifting the ban was associated with the endorsement of value-expressive reasons to lift the ban and the rejection of ego-defensive and value-expressive reasons to keep the ban; by contrast, disapproval of lifting the ban was associated with the endorsement of ego-defensive and value-expressive reasons to keep the ban and the rejection of value-expressive reasons to lift the ban. Results are discussed in terms of the implications for the functional approach to attitudes and persuasion.     

Battered women in the criminal justice system: An analysis of gender stereotypes

Battered women charged with killing their abusers present a dilemma to the criminal justice system. Myths and stereo-types about women and battered women play a prominent role in the courtroom presentation of both defense and prosecution cases. While the prosecution may attempt to discredit the defendant for not living up to the standard of a ‘good woman’, the defense counters with an equally distorted portrayal of the defendant as ultra-feminine: the passive, helpless victim. Ten court cases of battered women charged with the death of their partners form the basis for a gender analysis of the social construction of the trial setting. This analysis includes the structure of the trial, the language of the trial interchange, the participants in the process, and the role the defendant played in her own defense.     

Spatial limits to the detection of transpositional symmetry in dynamic dot textures

If a set of random dots is translated along a uniform axis and superimposed on itself, then the resulting texture is seen to have three possible perceptual outcomes depending on the degree of translation: pairedness, striation, and randomness. Similar perceptual effects are obtained by plotting identical point-pairs randomly in space and uniformly over time. The threshold between striation and randomness in dynamic dot textures was investigated, since it represents a spatial limit to the detection of transpositional symmetry. This limit was found to vary as a function of three factors: stimulus field diameter, retinal eccentricity, and high frequency attenuation. The limit was found to be invariant over a fourfold range of texture density. It is proposed that the ability of the human visual system to detect correlations in dynamic transpositionally symmetric textures is the result of the activation of populations of orientationally selective cells identified in the mammalian visual cortex. It is also proposed that the limits to this ability could be related to the average size of the receptive fields of such cells within a given region of the retina.     

Identification of vowels in “vowelless” syllables

Traditionally, it has been held that the primary information for vowel identification is provided by formant frequencies in the quasi-steady-state portion of the spoken syllable. Recent search has advanced an alternative view that emphasizes the role of temporal factors and dynamic (time-varying) spectral information in determining the perception of vowels. Nine vowels spoken in /b/ + vowel + /b/ syllables were recorded. The syllables were modified electronically in several ways to suppress various sources of spectral and durational information. Two vowel-perception experiments were performed, testing subjects’ ability to identify vowels in these modified syllables. Results of both experiments revealed the importance of dynamic spectral information at syllable onset and offset (in its proper temporal relation) in permitting vowel identification. On the other hand, steady-state spectral information, deprived of its durational variation, was a poor basis for identification. Results constitute a challenge to traditional accounts of vowel perception and point toward important sources of dynamic information.     

Effects of semantic and nonsemantic cued orienting tasks on associative clustering in free recall

Memory & Cognition - During presentation of a randomized list of nonadjacent associative pairs, Ss heard a cue after each word designating the task to be performed. All Ss performed two tasks....