The Daily Omnivore

Engrams [en-gram] are a hypothetical means by which memory traces are stored as biophysical or biochemical changes in the brain (and other neural tissue) in response to external stimuli. They are also sometimes thought of as a neural network or fragment of memory, sometimes using a hologram analogy to describe its action in light of results showing that memory appears not to be localized in the brain. The existence of engrams is posited by some scientific theories to explain the persistence of memory and how memories are stored in the brain. The existence of neurologically defined engrams is not significantly disputed, though their exact mechanism and location has been a focus of persistent research for many decades.

The term was coined by the little-known but influential German evolutionary biologist Richard Semon. Overall, the mechanisms of memory are poorly understood. Such brain parts as the cerebellum, striatum, cerebral cortex, hippocampus, and amygdala are thought to play an important role in memory. For example, the hippocampus is believed to be involved in spatial and declarative learning, as well as consolidating short-term into long-term memory.

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Experiential avoidance (EA) has been broadly defined as attempts to avoid thoughts, feelings, memories, physical sensations, and other internal experiences—even when doing so creates harm in the long-run. The process of EA is thought to be maintained through negative reinforcement—that is, short-term relief of discomfort is achieved through avoidance, thereby increasing the likelihood that the behavior will persist.

Importantly, the current conceptualization of EA suggests that it is not negative thoughts, emotions, and sensations that are problematic, but how one responds to them that can cause difficulties. In particular, a habitual and persistent unwillingness to experience uncomfortable thoughts and feelings (and the associated avoidance and inhibition of these experiences) is thought to be linked to a wide range of problems.

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In Freudian psychology, the pleasure principle is the psychoanalytic concept describing people seeking pleasure and avoiding suffering (pain) in order to satisfy their biological and psychological needs. Furthermore, the counterpart concept, the ‘reality principle,’ describes people choosing to defer gratification of a desire when circumstantial reality disallows its immediate gratification. In infancy and early childhood, the Id (one of the three components of Freud’s model of the psyche) rules behavior by obeying only the pleasure principle. Maturity is learning to endure the pain of deferred gratification, when reality requires it; thus, the psychoanalitic Sigmund Freud proposes that ‘an ego thus educated has become ‘reasonable’; it no longer lets itself be governed by the pleasure principle, but obeys the reality principle, which also, at bottom, seeks to obtain pleasure, but pleasure which is assured through taking account of reality, even though it is pleasure postponed and diminished.’

Sigmund Freud discusses this idea, pleasure principle, and its limits in more details in his book, ‘Beyond the Pleasure Principle,’ published in 1921. In his discussion of the opposition between Eros, the life instinct, and the Thanatos, the death instinct, he examines the role of the repetition compulsion caused by the pleasure principle and of the sexual instincts.