Effects of different acquisition procedures on response variability

In three experiments with college students, the effects of different acquisition procedures on response variability were studied. The computer keypressing task involved learning a sequence with a minimum number of presses on a subset of the keyboard. Procedures differed in type of training and in the number, size, and sequence of training steps. Experiment 1 showed that instructions and shaping in three steps generated less variability in the number of responses made in each keypress sequence than shaping in six steps. Subsequent experiments showed that a large increase in the response requirement early in shaping increased variability. Postacquisition variability remained unchanged in the number of responses per sequence—the aspect of responding on which reinforcement was contingent—but declined in location and timing of keypressing. The results are discussed in terms of the implicit reinforcement of variability and how the acquisition of qualitatively different response strategies could influence variability.     

Counselling to enhance gifts and talents and undo underachievement of girls

Earlier papers (Wilgosh, 1993, 1996b) examined how societal expectations of girls influence their failure to realize their full potential, particularly in mathematics and sciences. Societal influences on girls, particularly overt and more subtle messages conveyed through the press, were examined. This paper reviews issues and concerns identified in the earlier papers. Then, counselling approaches are considered, to enhance gifts and talents and undo underachievement which may be, at least in part, a result of negative and confusing messages girls receive through many different societal sources.     

Infusing Culturally Responsive Instruction to Improve Mathematics Performance of Latino Students with Specific Learning Disabilities

Culturally responsive instruction has the advantage of helping diverse students make academic gains. The purpose of this study was to investigate the effects of culturally infused mathematics lessons on the academic achievement of five middle school Latino students with specific learning disabilities in a resource classroom. We used an ABACACA multiple treatment reversal design, in which two forms of culturally responsive instruction (B) and its modification (C) were compared with the traditional instruction (A). The results of the study indicated that the modified culturally responsive mathematics instruction (C) was associated with increases in positive gains in participants' daily mathematics quizzes. Limitations and implications are discussed in relation to culturally responsive instruction for middle school Latino students with specific learning disabilities.     

Initial hydration status, fluid balance, and psychological affect during recreational exercise in adults

There is little information on the impact of hydration status on the psychological response to exercise despite potential implications for adherence to an exercise programme and for overall health and fitness. We investigated initial hydration status, fluid balance, and psychological responses associated with a typical recreational exercise session in healthy adults. Fifty-two participants performed a freely chosen gymnasium-based exercise session at a fitness centre, with ad libitum access to fluids. Urine samples were collected on arrival for analysis of osmolality. Sweat loss was estimated from the change in body mass after correction for fluid intake and urinary losses. Subjective psychological ratings were recorded before and after exercise. Pre-exercise urine osmolality was above 900 mOsmol · kg(-1) (used as a threshold for hypohydration) in 37% of participants. Fluid intake during exercise was 390 ± 298 mL, while estimated sweat loss was 794 ± 391 mL. The percentage change from pre-exercise body mass was -0.62 ± 0.20%. Physically active adults who arrived to take part in exercise hypohydrated reported more negative changes in psychological affect in response to their subsequent freely chosen recreational exercise session than those classified as euhydrated prior to exercise (-0.2 ± 0.7 vs. 0.8 ± 0.7; P < 0.005).