“How Do You Know Unless You Look?”: Brain Imaging, Biopower and Practical Neuroscience

Brain imaging is a persuasive visual rhetoric by which neuroscience is articulated as relevant to the construction and maintenance of desirable selves. In this essay, I describe how "brain-based self-help" literature disseminates neuroscientific vocabularies to public audiences. In this genre, brain images are an authoritative visual resource for translating neuroscience into a comprehensive program for living. I use Foucault's discussion of biopower to describe the ways in which brain-based self-help literature enables self-constitution in a biosocial age where health is a central means of communicating personal worth, social value and political order. The implications of this continuous self-fashioning are not limited to the personal realm but have important political consequences.     

The role of symmetry in determining perceived centers within shapes.

This study was designed to assess the effects of symmetry and plane of presentation on the determination of the perceptual center of flat figures. Experiment 1 demonstrates the existence of effects in improving center determination, both in the number of sides of the shape and in rotational and reflective symmetry (confounded in the experiment). Experiment 2 shows that the presentation plane has no effect on center determination. In Experiment 3, we divide the effects of the two symmetry types, showing that rotational symmetry alone is as effective as the presence of both symmetry types--that is, the presence of symmetry axes is not very useful in finding perceived centers.     

The role of symmetry in determining perceived centers within shapes

This study was designed to assess the effects of symmetry and plane of presentation on the determination of the perceptual center of flat figures. Experiment 1 demonstrates the existence of effects in improving center determination, both in the number of sides of the shape and in rotational and reflective symmetry (confounded in the experiment). Experiment 2 shows that the presentation plane has no effect on center determination. In Experiment 3, we divide the effects of the two symmetry types, showing that rotational symmetry alone is as effective as the presence of both symmetry types—that is, the presence of symmetry axes is not very useful in finding perceived centers.     

Amodal completion versus induced inhomogeneities in the organization of illusory figures.

An analysis is presented of a phenomenological model of illusory contours. The model is based on amodal completion as the primary factor giving rise to the illusory figure. In the experiment, conducted by the method of paired comparisons, the same parameter was manipulated in two series of equivalent configurations. The first series yielded examples of amodal completion, the second examples of illusory figures. Three groups of subjects evaluated the magnitude of completion, the brightness contrast of the illusory figure, and the contour clarity of the illusory figure. A control experiment was conducted, which demonstrated that in these configurations amodal completion and amodal continuation behave in the same way. Line displacement did not influence the brightness or the contour clarity of the illusory figures, though it influenced the magnitude of amodal completion. These results are in agreement with the energetic model developed by Sambin.     

Racism,stress, and sense of personal control among Aboriginal Australian pregnant women

Objectives

To characterise racism experiences in the past year and to investigate a causal association between racism, stress, and sense of personal control in a sample of pregnant South Australian Aboriginal women.

Methods

Data was from the baseline sample of 369 Aboriginal women participating in a randomised controlled trial to prevent early caries in children. Data on demographics, racism experiences, stress, sense of personal control, and health behaviours were collected through interview-guided questionnaires. Linear regression modelling was used to test the association between racism and stress and sense of personal control in separate models. The final models presented were adjusted for confounding.

Results

Participant mean age was 24.7 years (SD ±0.30; Min–Max: 14–43 years). Almost two-thirds (64.7%) resided in rural and regional areas and the highest educational attainment for almost three-quarters (73.7%) was high school or less. Nearly half (48.3%) reported at least one experience of racism in the previous year and almost one third (31.8%) reported racism occurring in a public setting. The adjusted regression coefficients for the effect of racism on stress and sense of personal control were respectively 0.61 (95% confidence interval [CI] 0.28, 0.93) and −0.36 (95% CI −0.68, −0.04).

Conclusions

Our findings contribute with evidence that racism is one of the psychosocial causes of poor mental health among Aboriginal Australians. Culturally sensitive and safe mental health interventions may be beneficial in buffering racism effects during pregnancy. Societal-level policies aimed at both naming and reducing institutionalised racism against Aboriginal Australian Aboriginals are necessary.