For decades, archaeologists and anthropologists seeking to explain the origins of agriculture in the Near East relied heavily on the "Broad Spectrum Revolution" (BSR) hypothesis. First articulated by Kent Flannery in the late 1960s, the BSR hypothesis posits that at the end of the Pleistocene epoch, rapidly changing climatic conditions forced hunter-gatherer populations to drastically diversify their diets. According to this model, as traditional populations of large herd animals declined in the face of environmental shifts, human groups were compelled to broaden their subsistence base to include smaller, more labor-intensive resources—such as wild cereals, legumes, small game, fish, and waterfowl. Flannery argued that this necessary dietary diversification required the innovation of new technologies for the processing and storage of these marginal foods, which in turn restricted the mobility of foraging groups and ultimately familiarized them with the botanical characteristics of the plants that would later be fully domesticated.
While the BSR framework elegantly connects terminal Pleistocene environmental stress to the preconditions for agricultural development, recent archaeobotanical evidence has severely challenged its historical timeline and causal logic. Excavations at Ohalo II, a submerged and exceptionally well-preserved site on the Sea of Galilee, have revealed that hunter-gatherers were already heavily exploiting wild cereals and small game more than 10,000 years before the putative onset of the Broad Spectrum Revolution. These findings strongly indicate that broad-spectrum foraging was not a novel adaptation triggered by sudden ecological pressure, but rather a long-standing, flexible strategy employed by human populations throughout much of the Upper Paleolithic.
Furthermore, contemporary anthropologists argue that the traditional BSR hypothesis implicitly imposes a modern framework of economic rationality onto prehistoric foragers. This perspective completely overlooks the possibility that broad-spectrum foraging was driven by social or political factors, such as the desire to host competitive feasts or to establish enduring territorial markers through delayed-return resource management. In many documented foraging societies, the acquisition of labor-intensive, easily storable foods is linked more to status-building and social obligations than to caloric necessity. By strictly casting dietary diversification as a frantic, utilitarian response to sudden ecological scarcity, the BSR model fails to account for the complex social dynamics that frequently dictate subsistence choices and technological innovations in non-agricultural societies.
The Broad Spectrum Revolution hypothesis, as articulated by Kent Flannery in the first paragraph, depends on assuming which one of the following?
- AThe decline of large game populations at the end of the Pleistocene epoch was driven solely by climatic shifts, rather than by the hunting practices of early humans.
- BEvery prehistoric foraging society that experienced a decline in traditional large game eventually transitioned fully to agricultural food production.
- Prehistoric human populations would not have heavily relied on labor-intensive plant resources if large herd animals had remained sufficiently abundant.Answer
- DBroad-spectrum foraging was a subsistence strategy primarily designed to facilitate complex social dynamics such as competitive feasting.
- EHunter-gatherer groups were compelled to familiarize themselves with the botanical characteristics of plants before they could diversify their diets to include wild cereals.