Mirror self-recognition in ghost crab (Ocypode quadrata)

Animal Cognition - Mirror self-recognition has been examined primarily in vertebrate species, largely through the use of a mirror mark test. Recently, however, there has been growing interest in...     

Emotional vitality in infancy as a predictor of cognitive and language abilities in toddlerhood

Previous work by our group has shown that infant emotional vitality (EV), the lively expression of shared emotion both positive and negative, predicts cognitive and language abilities in toddlerhood. Specifically, infants who demonstrated a pattern of high emotional expression combined with high bids to their caregivers, fared significantly better on the Bayley II and Preschool Language Scales (PLS‐3) at 2 years of age than infants who showed both low expression and low bids to mother. That study was conducted on a large, low‐income, ethnically diverse sample. The current study was undertaken with a smaller but demographically similar sample as an effort to demonstrate the value of EV as a construct and to provide additional information about its links with later developmental outcomes. Replication that included a variation in the age at which EV was assessed provides support for the generalizability of the construct. In addition, this study examined EV's effects further into childhood than did the original study in order to insure they are not limited to a brief window in toddlerhood. The results indicate that over and above maternal psychological resources, EV expressed during positive/joyful and frustrating circumstances in 8‐month‐olds accounted for significant portions of variance in expressive language at 30 months and cognitive‐developmental assessments at 24 and 36 months. This study supports EV as an important relational‐emotional behaviour that increases experiences that optimize developmental outcomes. Successful replication suggests that EV holds promise as a construct with clinical utility for early interventions attempting to improve developmental outcomes in children from poor families. Copyright © 2005 John Wiley & Sons, Ltd.     

Apparent height of a stereokinetic cone is decreased by departure from circularity

Subjects made judgements of the comparative height of the stereokinetic cones seen for pairs of rotating figures with varying eccentricity and ellipticity. For any given eccentricity, ellipticity of the figure reduced the apparent height, with narrow ellipses seeming to be shallower. The effect is attributed to an interaction in constancy scaling.