Stimulus control of differential-reinforcement-of-low-rate responding

Five pigeons were given single-stimulus training on an 8-sec differential-reinforcement-of-low-rate schedule followed by steady-state generalization training using 12 wavelength stimuli. Three birds had a high percentage of reinforced responses on the training schedule and flat generalization gradients of total responses. The birds with fewer reinforced responses had much steeper generalization gradients. Generalization gradients plotted as a function of both stimulus wavelength and interresponse time showed that for most birds, stimulus control was restricted to responses with long interresponse times. Responses with very short interresponse times were not under stimulus control and there was some evidence of inhibitory control of short interresponse times. Interresponse-times-per-opportunity functions, plotted as a function of stimulus wavelength, showed that stimulus wavelength controlled the temporal distribution of responses, rather than the overall rate of response. The data indicate that the differential-reinforcement-of-low-rate schedule generates several response categories that are controlled in different ways by wavelength and time-correlated stimuli, and that averaging responses regardless of interresponse-time length obscures this control.     

Manipulating the temporal locus and content of mind-wandering

The human brain has a tendency to drift into the realm of internally-generated thoughts that are unbound by space and time. The term mind-wandering (MW) is often used describe such thoughts when they are perceptually decoupled. Evidence suggests that exposure to forward and backward illusory motion skews the temporal orientation of MW thoughts to either the future or past respectively. However, little is known about the impact of this manipulation on other features of MW. Here, using a novel experimental paradigm, we first confirmed that our illusory motion method facilitated the generation of MW thoughts congruent with the direction of motion. We then conducted content analyses which revealed that goal orientation and temporal distance were also significantly affected by the direction of illusory motion. We conclude that illusory motion may be an effective means of assaying MW and could help to elucidate this ubiquitous, and likely critical, component of cognition.     

Consciously monitored grasping is vulnerable to perceptual intrusions

The idea of functional differentiation between vision-for-action and vision-for-perception has been supported by evidence from different domains. According to this account, perception is based on consciously accessible, relative representations, whereas vision-for-action is performed in an analytic, automatic manner. Support for this idea comes from studies that showed that unlike perception, grasping movements are refractory to illusions and to Weber’s law. Yet, interactions between the systems may occur when an action is performed in a less automated fashion. To test this idea, we asked participants to monitor their fingers apertures in flight and to halt their movement for a short duration when they felt that their aperture reached a maximum amount. The results showed that movements in the monitored condition were biased by the Ponzo illusion and showed atypical adherence to Weber's law. These results show that action and perception are more likely to interact when movements are performed in a controlled manner.     

Events,processes, and the time of a killing

The paper proposes a novel solution to the problem of the time of a killing (ToK), which persistently besets theories of act-individuation. The solution proposed claims to expose a crucial wrong-headed assumption in the debate, according to which ToK is essentially a problem of locating some event that corresponds to the killing. The alternative proposal put forward here turns on recognizing a separate category of dynamic occurrents, viz. processes. The paper does not aim to mount a comprehensive defence of process ontology, relying instead on extant defences. The primary aim is rather to put process ontology to work in diagnosing the current state of play over ToK, and indeed in solving it.     

“Scattered In Times”

Climate change is a temporally fragmented phenomenon: the causes and effects at work are dispersed over a remarkably long time period. Climate change exceeds human ability to forecast and quantify its effects in time. This creates serious epistemic, moral, and psychological difficulties and poses challenges to generating adequate ethical responses. Augustine’s understanding of time as a measure of imagination emphasizes the way in which human beings actively shape their sense of time. He sees “looking forward” in time as a matter of spiritual vocation that collects the self out of dispersion and connects to a transgenerational collective. A notable example of how this “looking forward” may be practiced is singing the Psalms. The Augustinian “temporal imagination” links the imaginative, affective, moral, and vocational dimensions of measuring time. This offers some preliminary avenues for reimagining a sense of time responsive to climate change’s temporal fragmentation.     

TIME, (COM)PASSION,AND ETHICAL SELF-FORMATION IN EVANGELICAL HUMANITARIANISM

This article examines narratives, images, and stories that give insight to everyday experimentation and ethical self-formation. I use the case of World Vision and its early leaders to unpack genealogies of American evangelical humanitarianism. Rather than seeking to identify American evangelicalism’s normative ethical stance, I aim to expand the discussion in anthropology of ethics on ethical self-formation through examining the tensions, reflections, and processes of becoming among evangelical humanitarians. In doing so, I examine two focal areas of ethical self-formation among early World Vision leaders. The first is oscillation between and mixing of passion and compassion frameworks in the American evangelical imagination. Second, I identify a range of temporal frames that evangelicals draw on to make sense of and formulate ethical responses to human needs encountered abroad.