Free-ranging dogs assess the quantity of opponents in intergroup conflicts

In conflicts between social groups, the decision of competitors whether to attack/retreat should be based on the assessment of the quantity of individuals in their own and the opposing group. Experimental studies on numerical cognition in animals suggest that they may represent both large and small numbers as noisy mental magnitudes subject to scalar variability, and small numbers (≤4) also as discrete object-files. Consequently, discriminating between large quantities, but not between smaller ones, should become easier as the asymmetry between quantities increases. Here, we tested these hypotheses by recording naturally occurring conflicts in a population of free-ranging dogs, Canis lupus familiaris, living in a suburban environment. The overall probability of at least one pack member approaching opponents aggressively increased with a decreasing ratio of the number of rivals to that of companions. Moreover, the probability that more than half of the pack members withdrew from a conflict increased when this ratio increased. The skill of dogs in correctly assessing relative group size appeared to improve with increasing the asymmetry in size when at least one pack comprised more than four individuals, and appeared affected to a lesser extent by group size asymmetries when dogs had to compare only small numbers. These results provide the first indications that a representation of quantity based on noisy mental magnitudes may be involved in the assessment of opponents in intergroup conflicts and leave open the possibility that an additional, more precise mechanism may operate with small numbers.     

Color at the point of sale: Psychological and communicative implications

The environment that surrounds a consumer when they are at a point of sale can influence them both psychologically and communicatively. In this sense, the study arises from the need to discover the capacity of influence that colors of the components of the commercial establishment (wall, floor, ceiling, and furniture) have. The aim is to determine whether these factors influence the psychological level (feeling of pleasantness, calmness, etc.) and the communicative experience received in stores. The quasi-experimental methodology made it possible to study the impact of the independent variables (colors of the different components) on the dependent variables (psychological and communicative). For this purpose, two methods of measurement were constructed: a tool for the analysis of commercial establishments which allowed to establish patterns and a reception protocol capable of measuring both levels of influence of components and colors, by means of a reception test comprising of Level I (psychological) and Level II (communicative). This survey was applied to a total sample of 315 subjects. Overall, the study makes it possible to define which architectural components and colors stores should have in order to exert a certain perceptual influence on the subject. In general terms, this study reflects how the color of the different components of the space can influence the subject's primary perception of the establishment, with respect to the feeling of pleasantness, comfort, stimulation, calmness, security, spaciousness, formality, and warmth, as well as the perception of the quantity and quality of the information received and overall satisfaction and confidence.