This book grew out of our intensive research collaboration over the last 9 years. The order of
the book's authorship could have been determined by a coin flip. Shared interests in the …

Since the Industrial Revolution, human societies have experienced high and sustained rates
of economic growth. Recent explanations of this sudden and massive change in economic …

In the short history of behavioral immune system (BIS) research, scholars have developed a
number of empirical strategies for testing BIS hypotheses. These strategies have led to a …

Throughout human evolutionary history, members of unfamiliar out-groups are likely to have
posed significant disease threats. The current studies assessed whether concerns about …

Individual danger and collective danger have very different effects according to the
predictions of a theory called regality theory, based on evolutionary psychology. This study …

The parasite stress hypothesis predicts that individuals living in regions with higher
infectious disease rates will show lower openness, agreeableness, and extraversion, but …

What environmental factors are associated with individual differences in political ideology,
and do such associations change over time? We examine whether reductions in pathogen …

The parasite-stress theory of sociality is a new perspective on human social psychology and
behavior. As an ecological and evolutionary theory of values or core preferences, it applies …

People are parasitically modified animals as a result of interactions with parasites both
during evolutionary historical generations and during their lifetimes. By parasites we mean …

Four causal theories of authoritarianism are compared:(1) intrapsychic problems according
to psychodynamic theory,(2) a dangerous world view according to a motivational theory of …