Spatial frequency thresholds for face recognition when comparison faces are filtered and unfiltered

Previous work has shown an advantage of middle spatial frequencies (SFs) in face recognition. However, a few recent studies have suggested that this advantage is reduced when comparison and test stimuli are spatially filtered in a similar way. In the present study, we used standard psychophysical methods, in combination with a match-to-sample task, to determine the SF thresholds for face matching under conditions in which: (1) comparison stimuli were unfiltered and (2) comparison stimuli were spatially filtered in the same way as test stimuli. In two experiments, we show that SFs closer to the middle band are sought out more in the former case than in the latter. These results are compatible with the idea that a middle band of SFs will be most useful for any visual task and that the breadth of this optimal middle band will vary depending on task characteristics.     

Prenatal Representations of Coparenting Among Unmarried First‐Time African American Mothers

Results of semistructured interviews with 45 pregnant unmarried first‐time African American mothers indicated a wide range of expectancies concerning the coparenting relationship they would develop with others once their baby arrived. Most common coparenting systems projected by respondents involved maternal grandmothers and/or the babies' fathers, though other caregivers were explicitly anticipated in a smaller number of cases. Multiperson coparenting systems were the norm, and only 2 of 45 respondents anticipated that they would be entirely on their own with no coparental system whatsoever. Qualitative analyses of mothers' narratives about postbaby coparenting systems revealed five main constructions: having thought about and anticipating coparenting, positive in outlook; having thought about and anticipating coparenting, but with mild concerns (conflict, unreliability); having thought about coparenting and anticipating limited or no support; having thought about coparenting and anticipating significant conflict and nonsupport; and having not thought much about coparenting, being neither focused on nor worried about this issue. Illustrations of each of these types are provided, and directions for family science and practice are discussed.     

The concept possession hypothesis of self-consciousness

This paper presents the hypothesis that concept possession is sufficient and necessary for self-consciousness. If this is true it provides a yardstick for gauging the validity of different research paradigms in which claims for self-consciousness in animals or human infants are made: a convincing demonstration of concept possession in a research subject, such as a display of inferential reasoning, may be taken as conclusive evidence of self-consciousness. Intuitively, there appears to be a correlation between intelligence in animals (which presupposes concept possession) and the existence of self-consciousness. I present three discussions to support the hypothesis: an analogy between perception and conception, where both are self-specifying; an argument that any web of concepts will always include the self-concept; and a fresh interpretation of Bermũdez (1998) showing how his theory of non-conceptual content provides strong support for the concept possession hypothesis.     

The relationship of depression and somatic focus to experimental and clinical pain in chronic pain patients

Abstract

The present study examined Fields' proposal that depression increases the sensory experience of pain in part through greater somatic focus. Experimental and clinical pain measures were compared to self-report of depression and somatic focus in 60 chronic pain patients. Depression scores were unrelated to pain threshold or tolerance on the cold-pressor test. However, as hypothesized by Fields, path analytic models suggested that depression had a direct influence on the evaluative and affective aspects of pain, but the relationship between depression and sensory pain was mediated by somatic focus. These results provide partial support for Fields' neurobiological model of pain and depression.     

Hierarchical Error Evaluation: The Role of Medial-Frontal Cortex in Postural Control

Motor error evaluation appears to be a hierarchically organized process subserved by 2 distinct systems: a higher level system within medial-frontal cortex responsible for movement outcome evaluation (high-level error evaluation) and a lower level posterior system(s) responsible for the mediation of within-movement errors (low-level error evaluation). While a growing body of evidence suggests that a reinforcement learning system within medial-frontal cortex plays a crucial role in the evaluation of high-level errors made during discrete reaching movements and continuous motor tracking, the role of this system in postural control is currently unclear. Participants learned a postural control task via a feedback-driven trial-and-error shaping process. In line with previous findings, electroencephalographic recordings revealed that feedback about movement outcomes elicited a feedback error–related negativity: a component of the human event-related brain potential associated with high-level outcome evaluation within medial-frontal cortex. Thus, the data provide evidence that a high-level error-evaluation system within medial-frontal cortex plays a key role in learning to control our body posture.     

Russell and richard brinkley on the unity of the proposition

Between 1903 and 1918 Russell made a number of attempts to understand the unity of the proposition, but his attempts all foundered on his failure clearly to distinguish between different senses in which the relation R might be said to relate a and b in the proposition aRb: he failed to distinguish between the relation as truth-maker and the relation as unifier, and consequently committed himself again and again to the unacceptable consequence that only true propositions are genuinely unified. There is an anticipation of this confusion in the writings of the fourteenth-century philosopher Richard Brinkley     

The Unity of the Proposition: Reply to Denyer

The paper replies to some criticisms by Nicholas Denyer of my recent book on the unity of the proposition.     

Lone‐Actor Terrorists’ Emotions and Cognition: An Evaluation Beyond Stereotypes

Lone‐actor terrorists are very often presented as emotionally and/or cognitively impaired—yet is it really the case? The present article provides the first rigorous assessment of the hypotheses according to which a high level of negative emotions, especially anger, and a lack of cognitive flexibility and complexity play a role in lone‐actor terrorists’ violent actions. Using a sample of lone‐actor terrorists’ writings, we use the LIWC (a fully automated language use analysis software) to compare terrorists’ cognition and emotion with those of other control groups, most notably nonviolent radical activists. Results strongly support the first hypothesis but clearly refute the second one, suggesting that lone‐actor terrorists are in fact characterized by a specific combination of high‐anger and high‐cognitive complexity. These method and results lay the groundwork for a more systematic and nuanced analysis of the psychology of terrorists, which is currently in a deadlock.     

Directional learning,but no spatial mapping by rats performing a navigational task in an inverted orientation

Previous studies have identified neurons throughout the rat limbic system that fire as a function of the animal’s head direction (HD). This HD signal is particularly robust when rats locomote in the horizontal and vertical planes, but is severely attenuated when locomoting upside-down (Calton & Taube, 2005). Given the hypothesis that the HD signal represents an animal’s sense of directional heading, we evaluated whether rats could accurately navigate in an inverted (upside-down) orientation. The task required the animals to find an escape hole while locomoting inverted on a circular platform suspended from the ceiling. In Experiment 1, Long-Evans rats were trained to navigate to the escape hole by locomoting from either one or four start points. Interestingly, no animals from the 4-start point group reached criterion, even after 29 days of training. Animals in the 1-start point group reached criterion after about six training sessions. In Experiment 2, probe tests revealed that animals navigating from either 1- or 2-start points utilized distal visual landmarks for accurate orientation. However, subsequent probe tests revealed that their performance was markedly attenuated when navigating to the escape hole from a novel start point. This absence of flexibility while navigating upside-down was confirmed in Experiment 3 where we show that the rats do not learn to reach a place, but instead learn separate trajectories to the target hole(s). Based on these results we argue that inverted navigation primarily involves a simple directional strategy based on visual landmarks.     

Can a Connection to Culture Reduce Mental Illness Symptoms and Risk for Future Violence?

Recent policy initiatives and service provider strategic frameworks from the state of Victoria have highlighted intentions to invest in culturally safe practices for justice-involved Indigenous individuals. However, the culturally themed frameworks and protocols presented by health and justice organisations appear to be largely underpinned by theoretical and/or anecdotal evidence. This commentary summarises findings from the first Australian program of research to investigate the influence of cultural identity and cultural engagement on mental health symptoms and violence for Indigenous people in custody. Implications for correctional policy and forensic clinical practice are discussed in this article.