coherence is created across states of mind as a form of diachronic integration... such abilities to create coherence can be proposed to be shaped in part by the individual's experiential history, which enables the acquisition of a core integrative process.
Siegel distinguishes synchronic cohesion within a single self-state from the diachronic coherence that bridges discontinuous states across time, identifying the latter as the central integrative achievement shaped by attachment history.
, The Developing Mind: How Relationships and the Brain Interact to Shape Who We Are, 2020thesis