Size does matter: Women mentally rotate large objects faster than men

Performance in a computerized “mental rotation” task was measured in groups of males and females while they rotated Shepard‐Metzler‐like cube assemblies on either a standard laptop screen (size = 36 cm) or on a large display wall (584 cm) where the stimuli appeared at considerably larger sizes and within a much wider field of view than that typically used in most spatial tasks. Males and females did not differ significantly in performance in the standard size condition with regards to response time but females performed faster than males in the large display condition. Males were also found to be significantly more accurate than females, regardless of display. We found no sign of trading accuracy for speed for either of the sexes or screen size conditions. We surmise that such an effect may be due to differences in task‐solving strategies between the sexes, where a holistic strategy – which may be preferred by males is negatively affected by large object sizes, whereas a piecemeal approach, that may be preferred by females, is virtually unaffected by display size.     

The symbolic/value-expressive function of outgroup attitudes among homosexuals.

The claim that attitudes toward an outgroup symbolically represent beliefs that the outgroup violates important values was examined through the investigation of the intergroup versus intragroup nature of the relations between a sample of feminist lesbians (primarily involved in the women's movement), gay movement lesbians (primarily involved in the gay movement), and gay men. Consistent with the intergroup relations documented between some feminist women and men, feminist lesbians (compared with gay movement lesbians) had less favorable attitudes toward gay men, associated with fewer gay men, perceived less common fate with gay men, wished to cooperate less with gay men, and perceived less value similarity with gay men. These and other findings suggested that feminist lesbians shared an intergroup relationship with gay men, whereas gay movement lesbians and gay men shared an intragroup relationship. Consistent with the notion that intergroup attitudes symbolically represent beliefs that an outgroup violates important values, feminist lesbians' attitudes toward gay men were explained by their perceptions that gay men placed less importance on values they themselves regarded as important. The implications of these findings for understanding the nature of symbolic attitudes and subsequent research are discussed.     

Newspaper coverage of diseases and actual mortality statistics

The number of newspaper articles about various diseases and the amount of attention given to these diseases by 7 British national daily newspapers were compared with the actual mortality statistics for these diseases. Spearman rank correlations showed that there was no correspondence between the press's coverage of disease and mortality statistics.     

Cuban health psychology: A priority is the primary health care system

Cuban health psychology has experienced a great expansion during the last 25 years, both in the number of psychologists and in range of activities in the field. Today, psychologists are integrated at all levels of the national health system, an achievement which is particularly interesting in that Cuba is a developing country. In a position isolated from trends in international psychology, Cuba has developed a role for psychologists within the field of health which is adapted to its situation as a poor and socialistic country. Priority is given to preventive and community-based psychology within primary health care facilities. Psychologists in primary health care serve a composite client-group, with high priority given to pregnant women and to children. The work of these psychologists covers a wide range of health problems—-physical as well as mental—and focuses upon individuals as bio-psycho-social units. Their responsibilities include health promotion, disease prevention, consultation and treatment, rehabilitation, research and education. This report is based on a 2½ month long field study in Cuba, where Cuban health psychology, particularly as it relates to primary health care, was explored.     

Innovative behaviour in fish: Atlantic cod can learn to use an external tag to manipulate a self-feeder

This study describes how three individual fish, Atlantic cod (Gadus morhua L.), developed a novel behaviour and learnt to use a dorsally attached external tag to activate a self-feeder. This behaviour was repeated up to several hundred times, and over time these fish fine-tuned the behaviour and made a series of goal-directed coordinated movements needed to attach the feeder’s pull string to the tag and stretch the string until the feeder was activated. These observations demonstrate a capacity in cod to develop a novel behaviour utilizing an attached tag as a tool to achieve a goal. This may be seen as one of the very few observed examples of innovation and tool use in fish.     

The Representation of Mortality Statistics and the Perceived Importance of Causes of Death

This study investigated how different methods of presenting mortality statistics may influence subjective impressions of the importance of a given cause of death. Subjects were 214 students from the fifth year of a comprehensive school (average age 15). Each subject rated one of six causes of death on a scale labeled "extremely minor–extremely major cause of death" before and after receiving accurate information concerning the number of deaths per annum in the United Kingdom resulting from the cause in question. This information was presented in one of five forms: (a) a statement of what proportion of all deaths resulted from the specified cause; (b) a statement of what percentage of all deaths were so caused; (c) a pie chart representing the proportion pictorially; (d) a bar chart representing the proportion pictorially; and (e) a statement of absolute number of deaths from the specified cause without information on total number of deaths from all causes combined. Analysis showed that subjects discriminated between the different causes both before and after presentation of the information but their ratings were imperfectly calibrated with actual frequencies. Also, the changes in ratings following the information depended significantly on the mode of presentation. Except when subjects were told the absolute frequency, the changes were in the direction of decrease in perceived importance. This decrease was most marked in the bar chart and pie chart conditions. The data are interpreted in relation to the literature on statistical inference processes and on judgmental contrast.     

Sign- and goal-tracking in Atlantic cod (<Emphasis Type="Italic">Gadus morhua</Emphasis>)

When animals associate a stimulus with food, they may either direct their response towards the stimulus (sign-tracking) or towards the food (goal-tracking). The direction of the conditioned response of cod was investigated to elucidate how cod read cue signals. Groups of cod were conditioned to associate a blinking light (conditioned stimulus, CS) with a food reward (unconditioned stimulus, US), with the CS and the US located at opposite sides of the tank. Two groups were trained in a delay conditioning procedure (CS = 60 s, interstimulus interval = 30 s) and two groups were trained in a trace conditioning procedure (CS = 12 s, trace interval = 20 s). The response pattern was similar for the delay- and trace-conditioned groups. The initial main response at the onset of the CS was approaching the blinking lights, i.e. sign-tracking. In the early trials, the fish did not gather in the feeding area before the arrival of food. In the later trials, the fish first approached the blinking lights, but then moved across the tank and gathered below the feeder before the food arrived, i.e. sign-tracking followed by goal-tracking within each trial. These two responses are interpreted as reflecting two learning systems, i.e. one rapid, reflexive response directed at the signal (sign-tracking) and one slower, more flexible response based on expectations about time and place for arrival of the food (goal-tracking). The ecological significance of these two learning systems in cod is discussed.     

Omission of expected reward agitates Atlantic salmon (Salmo salar)

The evolutionary background for cognition and awareness is currently under ardent scrutiny. Poikilothermic vertebrates such as teleost fishes are capable of classical conditioning and have long-term memories, but it remains unknown to what degree such capabilities are associated with affective states. Here, we investigate whether the concept of frustration may apply to Atlantic salmon. In mammals, this paradigm comprises the omission of an expected reward (OER), which elicits behavioural and physiological coping responses (e.g. aggression and stress reactions). Six groups with 200 fish in each were conditioned to associate a flashing light (CS) with feeding. Conditioning over 22?days led to a change from aversion to attraction to the CS. Subsequently, 3 groups served as control, and 3 groups were subjected to an OER paradigm for 9?days, in which the expected food reward was delayed for 30?min during two out of three daily meals. Compared to controls, OER groups displayed higher levels of aggression and more heterogeneous growth rates, indicating a more pronounced social hierarchy. Cortisol levels did, however, not differ between treatments and both groups responded similarly to acute stress. These results indicate that teleost fishes, like mammals, respond aggressively to OER. The capacity to respond behaviourally to frustrating conditions thus likely reflects an adaptive response to environmental unpredictability, which has been conserved throughout vertebrate evolution.