what is environmental sensitivity?
the ability to perceive, process and respond to environmental influences
is environmental sensitivity unique to humans?
no, it is a fundamental trait observed across many species
do all people have the same level of environmental sensitivity?
no, there are substantial individual differences
how do highly sensitive individuals differ from less sensitive individuals?
highly sensitive individuals react more strongly to both negative and positive environments
what are examples of high environmental sensitivity?
noticing subtle cues, deeper emotional responses and stronger reactions to stress or support
why don’t all individuals exposed to adversity develop mental health problems?
individuals differ in environmental sensitivity
do positive environments always have positive effects?
no, benefits depend on the individual’s level of sensitivity
what broad factors contribute to individual differences in sensitivity?
biological, psychological and physiological characteristics
what genetic factors are linked to sensitivity?
variations in dopamine - and serotonin-related genes
what neural markers are associated with sensitivty?
amygdala reactivity and hippocampal volume
what temperament traits are linked to sensitivity?
behavioural inhibition and negative emotionality
what physiological markers indicate sensitivity?
heightened stress reactivity and immune reactivity
how is environmental sensitivity typically studied?
by testing whether a marker moderates the effect of environment on outcomes
what research design is commonly used?
interaction designs examining environment x sensitivity effects
how do twin studies capture environmental sensitivity?
by measuring within-pair differences in monozygotic (MZ) twins
what does greater within-pair variability indicate?
greater sensitivity to environmental influences
how are genetic variants linked to sensitivity identified?
through genome-wide association scans of twin discordance
what is a polygenic environmental sensitivity score?
a weighted sum of sensitivity-related genetic variants
how do questionnaires conceptualise sensitivity?
as a stable personality trait
what is the Highly Sensitive Person Scale (HSP)?
a self-report measure of environmental sensitivity in children
how many factors did early sensitivity scales propose?
one general sensitivity factor
what 3 factors emerged from later analyses on sensitivity?
ease of excitation, low sensory threshold, and aesthetic sensitivity
what is ease of excitation?
becoming easily overwhelmed by demands or busy environments
what is low sensory threshold?
discomfort with intense sensory input