For Love or Money: A Common Neural Currency for Social and Monetary Reward

Two papers in the current issue of Neuron (Izuma et al. and Zink et al.) report that activity in specific regions of the brain, especially the striatum, reflects a common signal of reward in both the economic (e.g., money) and social (e.g., praise and status) domains

Community-based Crisis Response: Evidence from Sierra Leone’s Ebola Outbreak

Postmortems on the recent Ebola outbreak in West Africa suggest that effective community engagement helped slow transmission by encouraging people to come forward and be tested. We evaluate the impact of Community Care Centers: a new crisis response model designed to allay fears about western medical care and, thus, encourage early reporting, isolation, and treatment. We employ new panel data on reported Ebola cases and a difference-in-difference design and find that Community Care Centers dramatically increased reporting, potentially reducing the spread of Ebola. Our results highlight how community-based efforts to increase confidence in health systems can be critical for crisis management

Multivariate Patterns in Object-Selective Cortex Dissociate Perceptual and Physical Shape Similarity

Prior research has identified the lateral occipital complex (LOC) as a critical cortical region for the representation of object shape in humans. However, little is known about the nature of the representations contained in the LOC and their relationship to the perceptual experience of shape. We used human functional MRI to measure the physical, behavioral, and neural similarity between pairs of novel shapes to ask whether the representations of shape contained in subregions of the LOC more closely reflect the physical stimuli themselves, or the perceptual experience of those stimuli. Perceptual similarity measures for each pair of shapes were obtained from a psychophysical same-different task; physical similarity measures were based on stimulus parameters; and neural similarity measures were obtained from multivoxel pattern analysis methods applied to anterior LOC (pFs) and posterior LOC (LO). We found that the pattern of pairwise shape similarities in LO most closely matched physical shape similarities, whereas shape similarities in pFs most closely matched perceptual shape similarities. Further, shape representations were similar across participants in LO but highly variable across participants in pFs. Together, these findings indicate that activation patterns in subregions of object-selective cortex encode objects according to a hierarchy, with stimulus-based representations in posterior regions and subjective and observer-specific representations in anterior regions

Measuring and bounding experimenter demand

We propose a technique for assessing robustness to demand effects of findings from experiments and surveys. The core idea is that by deliberately inducing demand in a structured way we can bound its influence. We present a model in which participants respond to their beliefs about the researcher's objectives. Bounds are obtained by manipulating those beliefs with "demand treatments." We apply the method to 11 classic tasks, and estimate bounds averaging 0.13 standard deviations, suggesting that typical demand effects are probably modest. We also show how to compute demand-robust treatment effects and how to structurally estimate the model

Using behavioral science to promote international development

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