Placing Age Differences in Cultural Context: A Comparison of the Effects of Age on PTSD After Disasters in the United States, Mexico, and Poland

Criterion symptoms of posttraumatic stress disorder (PTSD) were measured 6–12 months after Hurricane Andrew in the United States (non-Hispanic n = 270), Hurricane Paulina in Mexico (n = 200), and the 1997 flood in Poland (n = 285), using English, Spanish, and Polish versions of the Revised Civilian Mississippi Scale. The samples ranged in age from 18 to 88. Linear and quadratic effects of age were tested by using hierarchical multiple regression, with the effects of gender, trauma, and education controlled. Among Americans, age had a curvilinear relation with PTSD such that middle-aged respondents were most distressed. Among Mexicans, age had a linear and negative relation with PTSD such that younger people were most distressed. Among Poles, age had a linear and positive relation with PTSD such that older people were most distressed. Thus, there was no one consistent effect of age; rather, it depended upon the social, economic, cultural, and historical context of the disaster-stricken setting.     

Sedentary antlion larvae (Neuroptera: Myrmeleontidae) use vibrational cues to modify their foraging strategies

Learning abilities are exhibited by many animals, including insects. However, sedentary species are typically believed to have low capacities and requirements for learning. Despite this view, recent studies show that even such inconspicuous organisms as larval antlions, which employ an ambush predation strategy, are capable of learning, although their learning abilities are rather simple, i.e., limited to the association of vibrational cues with the arrival of prey. This study demonstrates, for the first time, that antlion larvae can use vibrational cues for complex modifications of their foraging strategies. Specifically, antlion larvae rapidly learn to differentiate between the vibrational cues associated with prey of different sizes, and they save resources by ignoring smaller prey in favour of larger, more energetically profitable prey. Moreover, antlion larvae can learn to associate vibrational cues with the loss of their prey, and they respond by burying their victims under the sand more often and more rapidly than do individuals with no opportunities to form such associations. These findings provide not only new insights into the cognitive abilities of animals but also support for the optimal foraging strategy concept, suggesting the importance of maximizing fitness output by balancing the costs and benefits of alternative foraging strategies.     

Alternative vision: Ethics,Power, and Levin's The Philosopher Gaze

Continental Philosophy Review -