Report on Altruism as the Foundation of Sexual Selection in Humans

This report examines the concept of altruism as a factor in sexual selection, based on Darwin's hypothesis from 1871. The study investigates how altruistic behavior might serve as a mating signal, influencing mate selection based on attractiveness. The methodology involved presenting participants with images of varying attractiveness and assessing their responses in terms of financial and non-financial altruism. The research employed a 2x2 MANCOVA design, utilizing facial images and online databases to measure altruistic tendencies. The results suggest that individuals exhibit greater altruism towards more attractive individuals, supporting the idea that altruism has evolved as a sexually selected trait. The report details the experimental design, participant selection, materials used, and statistical analysis, highlighting the ethical considerations and procedures followed. The findings contribute to understanding the evolutionary basis of altruism and its role in human mate selection, providing insights into how attractiveness influences altruistic behavior.

Altruism the basis of sexual selection
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Altruism the basis of sexual selection
Abstract
The study was done to explain the human altruism of sexual selection hypothesis which was
given by Darwin in the year 1871. This hypothesis told that altruism is a form of mating signal,
so as to know about the characteristics of opposite sex. This may increase the chance of selection
to mate. This hypothesis states that altruism is a sexually selected trait so as to increase the
chances of being attracted, retain and reproduce with the other sex. For the study, various
participants were chosen and were asked to read the information and then were presented a series
of images which were attractive and non-attractive. The observations were to be done in order to
check the financial altruism or non-financial altruism and was noticed that the participants were
choosing on the basis of attractiveness. This explained the evolution of altruism which
determines that the people show altruism for more attractive people. The 2- D facial images and
online facial database were used for the methodology and paired sample t-test for non-financial
altruism were utilized for the experimentation or the study.The more attracted people were
assumed to give more positive attribute range than the non-attractive ones. Various studies have
been reported for the past ten years. The whole experiment was based on the attractive and non-
attractive images.
Introduction
Altruism is the word coined by Auguste Comte, a French philosopher; it is derived from Latin
word ‘alteri' which means ‘someone else.' In French it is termed as ‘altruisme’ which means
selflessness; used as an antonym for selfishness. Altruism is defined as welfare to others which
may or may not harm or benefits themselves.There are many sexual selection theories which talk

about the natural selection of the living creatures on the basis of their mating patterns or
attractiveness towards opposite sex. One is the reproductive success theory determines the
natural selection by measuring the fitness of offsprings and by measuring the number of
offspring left. According to sexual propaganda theory mate was lead opportunistically, by
strength of mate signals, trophic resource, phenotypic characteristics, etc. and explained the
genetic diversity maintenance within the population. The Hola effect tells about the observer's
feelings, overall impressions of a person on others. Darwin and Ronald Fisher gave a great
contribution in the sexual theories by explaining that for natural selection the sexual selection is
also important and mating with the opposite partner the sperm competitiveness, physical features
are also important factors to get attracted.The study is done to give an explanation to the sexual
selection hypothesis given by Darwin in the year 1871. Altruism is known to be the mating
signal which is important to attract and influence the opposite partner for sex behavior.The
altruism was studied non-financially and financially using DV and IV. IV was the study done on
the basis of facial attractiveness that too within the group while the DV determines the dependent
variable which can be measured by social dilemma or online dictator game. Participants would
be more altruisic towards facial attractiveness.
Method
An experiment was designed within the group of few people or may consider them as
participants. Various images were pre-set into the category of attractiveness and unattractiveness;
participants were allowed to rate those attractive and non-attractive images.
Design
A between groups 2 x 2 MANCOVA design was adopted in which the independent variables
were attractiveness (high and low) and sex (male and female). The dependent variables were

altruism and cooperation. The experimental design included IV and DV. IV is the facial
attractiveness that includes 2 levels; the attractive and unattractive. This was a within groups IV.
Another one was dependent variable in which participants were asked to rate themselves which
was accompanied by a 1, low to 5, high Likert scale.
Participants and materials
For the study purpose, a large group of undergraduate students was invited to participate. It was
whole voluntary participation. All the participants were presented with the images; males viewed
female’s images and female viewed male’s one. 5 were attractive and 5 were unattractive i.e.
with 10 images in series. They were asked few questions about the images on the screen. The
whole experiment completed within 20 minutes. They were tested to respond to financial
altruism and other non-financial altruism. Researchers were involved in collecting and analyzing
the data.
Online facial images database was used as a source for 2 –D images. Images were preset
into 2 categories and the paper is provided on Moodle. A paired-samples t-test was used for non-
financial altruism.
Procedure
University’s health and life science (HLS) faculty’s human research ethics committee gave an
ethical approval for the conduction of experiment. Participants were invited to take voluntary
participation in this psychology course. Participants were allowed to enter the class, they were
given instructions about the study and were told that they are free if they want to withdraw their
names from the study. The software program "Open Sesame" was opened as instructed to the
participants. They were given their id numbers and then asked to read information letter,

requirements and details of the experiment. Then the participants have presented the images of
opposite sex; 10 images (5 attractive and 5 unattractive). They were asked few questions on
which basis they were checked to respond them for financial altruism and non-financial altruism
one measuring cooperation and one measuring generosity.