Well, first we’ll have to establish a control group of Paleolithic humans, and then…um…let me get back to you on that.
In all seriousness, the only way we know anything about the emotional life of the Greeks, or any other past civilization is through their surviving writings which, for pre-Renaissance societies was often limited to a handful of documents from the typically small segment of literate people. There are, of course, no writings from Paleolithic peoples, as they hadn’t gotten around to inventing papyrus, the printing press, or the Common Unix Printing System, and so we have no record, even subjective, of what they thought about the critical political, social, and cultural events of their day, including how much it pissed them off or how much guilt they felt about squeezing out H. neanderthalensis.
However, there appears to be little physiological change to the braincase from the Upper Palaeolithic era onward, and the range of human emotional capacity of all modern societies appears to be approximately the same (with consideration to differences in culture and environment) across the spectrum of ethnicity to the extent that unlike physiological diagnostic criteria (which assigns known prevalence of certain genetic-based disorders correlated with ethnic background) to effort is made to distinguish between “race” or ethnic characteristics with regard to psychological diagnostic criteria, and the prevailing evidence is that there is little if any epidemiological evidence that the prevalence of innate personality disorders varies significantly between different ethnic groups. Although we cannot conclude from this that the range of emotional capacity or experience has not changed over the span of modern human, there are no real indications that would lead us to believe that the early modern humans and even predecessors did not experience essentially the same basic emotional responses to common experiences, although the complexity with which such emotions could be expressed may have been more limited owing to the (presumed) primitive state of verbal communication.
It should be noted, however, that grammar is certainly not the primary medium for the expression of emotion; despite our modern focus on the spoken or written word to convey emotional state and response, we often fumble in expressing our true feelings to each other, or even stating them clearly to ourselves. Physiological responses such as hand/shoulder motion, eye contact, head position, and blush response, are far more indicative of emotional state, and are clearly long evolved features that are common across the variety of human population. Similarly, domestic animals that are kept for companionship (particularly canids) display behavior consistent with human emotion, including joy, sadness, trust, anger, fear, jealousy, and guilt (although it could be argued that this is an simulacrum of emotion evolved to appeal to the human desire for empathy). While more complex combinations of emotion may be the result of cultural inculcation and experience, the primary emotions seem to be common to all cultures and indeed, across the higher mammals in general, for the purpose of providing an instinctive guideline for behavior that is acceptable in social groupings.
Stranger