Postpartum exuberance: Not all women in a highly positive emotional state in the postpartum period are denying depression and distress

The question addressed in this study was whether or not mothers who scored low on self-report depression scales—so-called “deniers”—were denying their symptoms and suffering from an illusion of mental health. The findings did not support the interpretation that low-scoring mothers were denying other symptoms. Rather, low-scoring mothers: 1) experienced a wide range of emotions and similar levels of positive emotions compared to mid-symptom mothers; 2) changed their reported levels of depressive symptoms over the course of the study; 3) reported a variety of symptoms at levels similar to those of mothers in the mid symptom range; and 4) were affected negatively by having a diagnosis of depression, in a manner similar to mothers in the mid and high symptom groups. Furthermore, low symptom mothers consistently reported the most positive profiles of maternal adaptation with higher levels of maternal self-esteem and a high ratio of self-reported positive to negative affect. Thus, they appeared to be experiencing a heretofore underdescribed highly positive normal postpartum state that we have labeled “postpartum exuberance.” Postpartum exuberance, as well as a compromise of affective functioning associated with any lifetime diagnosis of depression regardless of the mothers' current level of depressive symptoms, highlights the complexity of emotional reactivity during the postpartum period. © 1997 Michigan Association for Infant Mental Health     

Human risky choice in a repeated-gambles procedure: an up-linkage replication of Lakshminarayanan, Chen and Santos (2011)

Lakshminarayanan et al. (J Exp Soc Psychol 47: 689–693, 2011) showed that when choice is between variable (risky) and fixed (safe) food amounts with the same expected values, capuchins prefer the safe alternative if choice is framed as a gain, but the risky alternative if it is framed as a loss. These results seem similar to those seen in human prospect-theory tests in choice between variable and fixed gains or losses. Based on this similarity, they interpreted their results as identifying a between-species commonality in cognitive function. In this report, we repeat their experiment with humans as subjects (an up-linkage replication). Whether choices were rewarded with candy or nickels, choice approximated indifference whether framed as gains or losses. Our data mirror those of others who found that when humans make risky choices within a repeated-trials procedure without verbal instruction about outcome likelihoods, preference biases seen in one-shot, language-guided, prospect-theory tests such as Tversky and Kahneman’s (Science 211:453–458, 1981) reflection effect may not appear. The disparity between our findings and those of Lakshminarayanan et al. suggests their study does not evidence a cognitive process shared by humans and capuchins.     

Role of Attention and Perceptual Grouping in Visual Statistical Learning

Statistical learning has been widely proposed as a mechanism by which observers learn to decompose complex sensory scenes. To determine how robust statistical learning is, we investigated the impact of attention and perceptual grouping on statistical learning of visual shapes. Observers were presented with stimuli containing two shapes that were either connected by a bar or unconnected. When observers were required to attend to both locations at which shapes were presented, the degree of statistical learning was unaffected by whether the shapes were connected or not. However, when observers were required to attend to just one of the shapes' locations, statistical learning was observed only when the shapes were connected. These results demonstrate that visual statistical learning is not just a passive process. It can be modulated by both attention and connectedness, and in natural scenes these factors may constrain the role of stimulus statistics in learning.     

The role of reference in children's acquisition of a miniature artificial language

Nursery school children were presented with a simple miniature artificial language in one of three conditions. In the first, the stimuli to which the words referred contained an inherent lawful relationship and the language syntax reflected this relationship. In the second, the stimuli contained an inherent lawful relationship but the language syntax did not reflect this relationship. In the third, no lawful relationship existed among the stimuli to which the words referred so the language syntax imposed an arbitrary relationship among stimuli. Subjects in the first group were able to produce more correct utterances than those in the other two groups when the stimuli to which the words referred were not present, suggesting that some form of semantic mediation mechanism was being used. Evidence from novel constructions indicates that for both groups using stimuli containing an inherent lawful relation there were interactions between semantic learning mechanisms and syntax learning mechanisms.