Blood pressure occupies a distinctive, if distributed, place in the depth-psychology corpus: it functions less as a subject of inquiry in its own right than as a physiological index through which the mind-body relation is made legible. The passages collected here span several distinct intellectual registers. In the psychophysiological tradition—represented most fully by Easwaran, Panksepp, Porges, and Fogel—blood pressure serves as a sentinel variable for the autonomic nervous system’s continuous negotiation between sympathetic arousal and parasympathetic restoration, implicating it directly in the somatic expression of emotional states such as anger, fear, and chronic stress. Panksepp’s work adds a crucial bidirectional dimension: baroreceptor feedback to the RAGE circuit means that elevated blood pressure does not merely result from anger but actively modulates the neural threshold for further rage, collapsing the distinction between affect and physiology. In the clinical-phenomenological strand—Strassman’s DMT studies, Levine’s trauma work, Feinstein’s floatation research—blood pressure appears as a safety parameter that frames and constraints altered-state investigation, a boundary condition separating permissible from dangerous somatic territory. Dayton places it within a broader cardiotoxic account of emotional stress, while James provides foundational definitional scaffolding. The central tension across these bodies of work is whether blood pressure should be read as cause, consequence, or co-constitutive element of psychological states—a question that remains unresolved and generative.