Impact of aging on fingerprint ridge density: Anthropometry and forensic implications in sex inference

The variation in the epidermal ridge's width between the sexes, during various growth stages, and among different populations has been previously assessed. However, the changes that occur with aging are barely known.The goal of this study was to analyse the degree of variation in epidermal ridge width due to aging. So that, fingerprint ridge density was estimated to establish their relationship with body and hand size changes that typically occur in adulthood.In this study, a sample of 213 adults of both sexes from a Spanish native population of different age ranges—18–30?years old (“junior” group) and 50–66?years old (“senior” group)—was used. Ridge density was assessed in three counting areas of the distal phalanx of each finger (radial, ulnar, and proximal). Height, weight, and a set of anthropometric measurements for both hands were also taken.Our results show that ridge density is higher in females than males throughout adulthood and decreases with aging in the radial and ulnar areas (as the hands widen) but not in the proximal region. Thus, a relationship between hand dimensions and ridge density was found.The data indicate that aging changes may conceal the recognized sex differences in ridge density, and so a better understanding of the topological variations in the epidermal ridge width throughout the life cycle and the factors involved would facilitate the interpretation of the differences between the sexes and different age groups.     

Low Power,First Offers,and Reservation Prices: Weak Negotiators are Self-anchored by Their Own Alternatives

Although most scholars recommend making the first offer in negotiations, recent research and practitioners' experience have uncovered a second-mover advantage in certain situations. In the current article, we explore this first- versus second-mover dynamic by investigating the circumstances under which negotiators would make less favorable first offers than they would receive were they to move second, focusing on the effects of negotiation power in the form of alternatives. Additionally, we examine the effects of low power on reservation prices and whether these effects could be mitigated using an anchor-debiasing technique. In Study 1, we manipulated negotiators' power in the form of the best alternative to the negotiated agreement and examined its effect on first offers and reservation prices. Our results showed that low-power negotiators would receive more favorable first offers than they would have made themselves when facing either low- or medium-power counterparts. Also, our results suggest that low-power negotiators had less favorable reservation prices than their medium- and high- power counterparts. In Study 2, we investigated whether this effect would persist in the face of anchor-debiasing techniques. Our results showed that while anchor-debiasing techniques did improve their first offers, low-power negotiators would still benefit from making the counteroffer rather than moving first. Our findings uncover the disadvantageous effects of low power on first-offer magnitude while offering practical advice to negotiators.