Since the reward schedule was dependent on performance history, fluctuations in animals' performance over the course of a block could have contributed to a correlation between large reward trials and high performance.
The rise of Asian and African markets, the spread of high speed communications, changing demographics, the growing wealth inequality and a host of other elements have contributed to a political landscape that rewards quick enemies, easy solutions and vitriolic and coarse language.
Pay is a big part of this, in the banking sector it has contributed to a culture of short-termism that rewards the big bet.
It led to a proliferation of additional punishments as status rewards, and contributed to a massive growth of America's imprisoned population.
However, much less is known about how phasic dopamine transients in the dorsal striatum contribute to a behavior driven by reward or reward-associated stimuli.
Brazil is leading a campaign to persuade rich nations to contribute to a fund that will reward developing countries that decrease rates of deforestation.
And other research shows that contributing to a food bank activates reward areas of the brain, even when those contributions are mandatory.
He also proposed that the companies, in exchange for the promotional benefit the service would bring, should contribute to a fund that would reward people who provided information that helped solve a crime.
Moreover, in the aftermath of the financial crash and in the midst of a housing crisis, many more people are beginning to realise that misallocation of land and inflated land values contribute to a dysfunctional economy that rewards land speculation and penalises productive investment.
The application of physics and chemistry to the study of the soft but very complex materials that make up foods, in conjunction with modern psychophysical and neurophysiological studies of pleasure and satiety, could both contribute to a deeper understanding of human reward systems as well as to development of new foodstuffs that could bring more pleasure and healthier lifestyles to the eater.
