From the weekly letter · 26 October 2026

Why cover this story this week?

A forgotten memory may be difficult to reach

Why do our earliest experiences become so difficult to remember? Researchers followed toddlers aged 18-24 months through learning, retrieval one day later and delayed testing up to six months later, using a naturalistic episodic-memory task. Computational modelling suggested that forgetting was not uniform: toddlers were as likely to retain the full memory as to lose it completely, while nearly a quarter retained only part. Accuracy during learning predicted full recall at the early test, but not at the delayed test.

Instead, a retrieval-specific EEG signature predicted complete recall before the toddlers gave their behavioural response. The findings support the idea that some early memories become inaccessible rather than simply disappearing, although behavioural failure cannot by itself establish whether a memory survives. Using the COVID-19 pandemic as a natural experiment, the researchers also linked maternal immune activation during pregnancy to altered vulnerability to forgetting. The broader lesson is that remembering depends not only on what was stored, but on the machinery available to retrieve it.

Editorial context written by AI from abstracts, not independent scientific validation. The kit and its verified quotes rely on the source paper, not on this letter.

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