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endocrine gland

any ductless gland that secretes hormones directly into the bloodstream to act on distant targets. Such glands include the pituitary gland, adrenal gland, thyroid gland, gonads (testis and ovary), and islets of Langerhans. Together, they comprise the endocrine system. Compare exocrine gland.

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Psychology term of the day

February 26th 2024

Cartesian self

Cartesian self

in the system of René Descartes, the knowing subject or ego. The Cartesian self is capable of one fundamental certainty because, even if all else is subject to doubt, one cannot seriously doubt that one is thinking, as to doubt is to think. Thus, Descartes concludes, cogito ergo sum (“I am thinking, therefore I exist”). From this position, Descartes argues that all ideas intuited by the self with the same clarity and distinctness as the cogito must be equally true; this enables the intuition of further indubitable truths, such as the existence of God and the external world. However, since the ideas clearest to the self are the contents of the mind, the notion of the Cartesian self has led to a radical dualism between the inner life of the mind (subjectivity) and the outer world of things (objectivity). It has also led to the idea that knowledge is necessarily subjective and has opened the question as to how the outer world, including other human beings, can be known except as an idea. See Cartesian dualism; egocentric predicament; solipsism.