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Comparisons of Maya forest gardens, the economic botany of the Maya forest, and identifications of plant remains in archaeological contexts converge on the value of the Maya forest as the reflection of the selective favoring of useful plants over time and across space. We have evaluated trees conserved in Maya milpas and present here an annotated list of significant categories of uses that transcend the ordinary, and highlight the extraordinary appreciation of plants and their role in the historical and cultural ecology of land use. Recognition of land cover significance, biodiversity, water conservation, erosion management, soil fertility principles, animal habitat essentials, and support for communities are all entangled with the role of plants. With an example of 160 confirmed trees favored in Maya milpa agricultural fields, we provide a window into economic values that dominate the Maya forest. 

Synopsis Internal state profoundly alters perception and behavior. For example, a starved fly may approach and consume foods that it would otherwise find undesirable. A socially engaged newt may remain engaged in the presence of a predator, whereas a solitary newt would otherwise attempt to escape. Yet, the definition of internal state is fluid and ill-defined. As an interdisciplinary group of scholars spanning five career stages (from undergraduate to full professor) and six academic institutions, we came together in an attempt to provide an operational definition of internal state that could be useful in understanding the behavior and the function of nervous systems, at timescales relevant to the individual. In this perspective, we propose to define internal state through an integrative framework centered on dynamic and interconnected communication loops within and between the body and the brain. This framework is informed by a synthesis of historical and contemporary paradigms used by neurobiologists, ethologists, physiologists, and endocrinologists. We view internal state as composed of both spatially distributed networks (body–brain communication loops), and temporally distributed mechanisms that weave together neural circuits, physiology, and behavior. Given the wide spatial and temporal scales at which internal state operates—and therefore the broad range of scales at which it could be defined—we choose to anchor our definition in the body. Here we focus on studies that highlight body-to-brain signaling; body represented in endocrine signaling, and brain represented in sensory signaling. This integrative framework of internal state potentially unites the disparate paradigms often used by scientists grappling with body–brain interactions. We invite others to join us as we examine approaches and question assumptions to study the underlying mechanisms and temporal dynamics of internal state.