Mother-infant Bonding in the Brain: a Mindfulness-based Intervention

Assessed with the 10-item Edinburgh Postnatal Depression Scale (EPDS). The EPDS is the most widely used self-rating scale to assess depressive symptoms in the perinatal period. The EPDS total score ranges from 0 to 30, with higher scores indicating more depressive symptoms. The questionnaire has been validated in Dutch postpartum women.

Assessed with the 10-item anxiety subscale of the Symptom Checklist (SCL-90). The total scores range from 10 to 50 and higher scores reflect more anxiety symptoms. The questionnaire has showed good reliability and validity in non-pregnant samples.

Assessed with the Parental Stress Questionnaire (PSQ, in Dutch: Opvoedingsbelastingvragenlijst), which is based on the Parenting Stress Index. This study uses only the first three subscales related to parenting: parent-child relationship problems, parenting problems and parental role restriction. Total scores range from 19 to 76 with higher scores indicating more parental stress. In order to interpret the level of parental stress experienced, subscale scores are converted into T-scores conform the norms of the child's age (e.g., 0 to 3 years). The questionnaire and subscales have showed good reliability and validity.

Assessed with video coding

Assessed with dual-EEG, with the Phase Locking Value (PLV) in the alpha band frequency (6-9 Hz) during the free play task. We expect that neural synchrony between mother and infant will increase (more) in the intervention group.

Assessed with dual-EEG, with the Phase Locking Value (PLV) in the alpha band frequency (6-9 Hz) during the still face paradigm. We expect that neural synchrony between mother and infant will increase (more) in the intervention group.

Assessed with the 12-item Postpartum Specific Anxiety Scale - Research Short Form - for global Crises (PSAS-RSF-C). Total scores range from 0 to 36, with higher scores representing greater postpartum-specific anxiety. The PSAS-RSF-C has been validated in postpartum women.

Assessed with the 16-item Penn-State Worry Questionnaire (PSWQ). The total score ranges from 16 to 80, with higher scores reflecting a stronger tendency to worry. The PSWQ has been validated in Dutch samples.

Assessed with the 15-item Three Facet Mindfulness Questionnaire Short Form (TFMQ-SF), consisting of the facets acting with awareness, non-judging and non-reacting. The total score ranges from 0 to 60, with higher scores indicating better mindfulness skills. The validity of the measure is established and indices of internal reliability were found to be adequate.

Assessed with the 3-item Self-Compassion Scale (SCS-3), which was derived from the Self-Compassion Scale (SCS) and the Self-Compassion Scale Short Form (SCS-SF). The total scores range from 3 to 15, with higher scores indicating higher levels of self-compassion.

Assessed with the 5-item Pre- and Postnatal Bonding Scale (PPBS). Total scores range from 14 to 56, with higher scores reflecting more positive feelings of bonding. The scale has shown good psychometric properties in Dutch perinatal women.

Assessed with the Infant Behavior Questionnaire - Revised - very short form (IBQ-R-vsf), including the subscales surgency, negative affect and effortful control. Total scores can be calculated over the items that received a numerical response, and range from 0 to 259. Higher scores reflect greater levels of infant temperament. The IBQ-R-vsf has been validated in parent samples.

Assessed with the 27-item adapted Interpersonal Mindfulness in Parenting Scale (IM-P). Total scores range from 27 to 135, with higher scores indicating greater levels of mindful parenting.

Assessed with the 16-item Maternal Self-Efficacy in the Nurturing Role questionnaire (SENR), of which validity and reliability has been established. Total scores range from 16 to 112, with higher scores representing higher levels of parenting self-efficacy.

Assessed with Goal Attainment Scaling (GAS). Before the intervention, mothers are asked to write down an overall goal. They also formulate the situation if things are: worse than at the current moment (-1), according to the current moment (0), a little better than the current moment (+1), much better than the current moment (+2), the best possible outcome (+3). In the next assessments, women will see their previously established goal and scales (-1, 0, +1, +2 and +3). They are asked to indicate what describes their current situation best. Validity and reliability of the GAS have been established.