Worthless ranking

Costly but worthless gifts facilitate courtship.

What are the characteristics of a good courtship gift? We address this question by modelling courtship as a sequential game. This is structured as follows: the male offers a gift to a female; after observing the gift, the female decides whether or not to accept it; she then chooses whether or not to mate with the male. In one version of the game, based on human courtship, the female is uncertai...

Worthless Movement: Agricultural Regression and Mobility

An Invasion of Cheats The Evolution of Worthless Nuptial Gifts

Nuptial gifts are food items or inedible tokens that are transferred to females during courtship or copulation . Tokens are of no direct value to females, and it is unknown why females require such worthless gifts as a precondition of mating. One hypothesis is that token giving arose in species that gave nutritious gifts and males exploited female preferences for nutritional gifts by substituti...

"Feeling worthless": an ethnographic investigation of depression and problem drinking at the Flathead reservation.

The study of depression, drinking and suicidality has long preoccupied students of American Indian life, in part because of the assumed connection between these specific forms of psychiatric distress and generalized demoralization. Given the significant variation in suicidal behavior and prevalence rates intertribally, this assumption deserves closer attention. Recently, researchers working wit...

Reducing the Computational Cost in Multi-objective Evolutionary Algorithms by Filtering Worthless Individuals

The large number of exact fitness function evaluations makes evolutionary algorithms to have computational cost (especially in Multi Objective Problems (MOPs)). In some realworld problems, reducing number of these evaluations is much more valuable even by increasing computational complexity and spending more time. To fulfil this target, we introduce an effective factor, in spite of applied fact...