Blocking the development of stimulus control when stimuli indicate periods of nonreinforcement

To learn whether prior discrimination training based on one stimulus would block learning about a subsequently added stimulus, rats were first trained to press a bar on a variable-interval schedule of food reinforcement. Occasional stimuli were presented during which no reinforcement was available. Responding became suppressed in the presence of these stimuli. Stimuli could be noise, light, or a compound of noise plus light. A group trained with noise in Phase 1, then trained with the compound in Phase 2, showed less suppression to light in a subsequent test than a group that had the same compound training in Phase 2 but only variable-interval training in Phase 1. This showed that prior training with noise blocked the development of control by light during compound training. Two further groups showed that noise training following compound training did not have the same effect on control by light

Airflow as a discriminative stimulus

In one experiment, pigeons were taught to discriminate airflow by having availability of reinforcement signalled by its presence and extinction signalled by its absence. After they reached criterion, some were trained on a discrimination reversal. Others were trained on an intradimensional discrimination with a low airflow velocity associated with reinforcement and a higher airflow velocity associated with extinction. All discriminations were learned rapidly, indicating that airflow velocity can function as a discriminative stimulus. In the second and third experiments, naive pigeons were trained to discriminate the presence of a compound stimulus (one of three tonal intensities paired with one of three airflow velocities) from its absence. These pigeons were subsequently given a component stimulus test during extinction on four stimulus values; the two training values, the tone alone, and the airflow alone. High or moderate velocity airflow controlled more responding than any of the three tone intensities. However, low velocity airflow controlled more responding only when a low intensity tone was employed

Latent variable modelling of the relationship between flow and exercise-induced feelings: an intuitive appraisal perspective

[Abstract]: The present study examined the relationship between self-reported levels of Flow (Csikszentmihalyi, 1975) and the post-exercise feelings of Positive Engagement, Revitalisation, Tranquillity, and Physical Exhaustion (Gauvin & Rejeski, 1993) using responses from 1, 231 aerobic dance exercise participants. Vallerand’s (1987) intuitive-reflective appraisal model of self-related affects and Csikszentmihalyi’s (1975) conceptual framework for optimal experience served as the guiding theoretical frameworks. It was hypothesised that self-reported flow would be positively associated with revitalisation, tranquillity and positive engagement while statistical independence was expected for physical exhaustion. First, participants completed the Flow State Scale (Jackson & Marsh, 1996) and second, the Exercise-induced Feeling Inventory (Gauvin & Rejeski, 1993) immediately after an aerobic dance exercise class. Latent variable analyses showed that the higher-order Flow factor was positively associated with post-exercise Positive Engagement, Revitalisation, and Tranquillity, but not with Physical Exhaustion. Flow state explained 35% of the variance in Positive Engagement, 31% of the variance in Revitalisation, and 22% of the variance in Tranquillity. It is concluded that self-reported flow in aerobic dance exercise is moderately associated with the experience of positive post-exercise feelings. Physical educators may wish to employ interventions to facilitate the flow experience during lessons that involve structured exercise

What to put on the user: Sensing technologies for studies and physiology aware systems

Fitness trackers not just provide easy means to acquire physiological data in real-world environments due to affordable sensing technologies, they further offer opportunities for physiology-aware applications and studies in HCI; however, their performance is not well understood. In this paper, we report findings on the quality of 3 sensing technologies: PPG-based wrist trackers (Apple Watch, Microsoft Band 2), an ECG-belt (Polar H7) and reference device with stick-on ECG electrodes (Nexus 10). We collected physiological (heart rate, electrodermal activity, skin temperature) and subjective data from 21 participants performing combinations of physical activity and stressful tasks. Our empirical research indicates that wrist devices provide a good sensing performance in stationary settings. However, they lack accuracy when participants are mobile or if tasks require physical activity. Based on our findings, we suggest a textitDesign Space for Wearables in Research Settings and reflected on the appropriateness of the investigated technologies in research contexts