ReviewSocial cognition in Turner’s Syndrome
Introduction
Impaired social cognition is sometimes a prominent feature of neurological disorders affecting the frontal lobes and limbic system, such as frontotemporal dementia. Studies of the effects of brain lesions have contributed substantially to our understanding of the neurobiology of social cognition. The study of genetic disorders is an important extension of this paradigm, potentially providing insights into genotypic influences on social behaviour.
Turner’s Syndrome (TS) is one of the most common chromosomal disorders in women, affecting around 1 in every 2,500 live births. It occurs when one X-chromosome in a phenotypic female is missing, and it therefore produces, in the classic case, a karyotype of 45,X rather than the usual female karyotype of 46,XX. Physically, TS commonly results in ovarian failure with consequent oestrogen deficiency. Substantial inter-individual variability exists; however, the physical characteristics of TS usually include short stature, webbing of the neck, micrognathia, and low-set ears and hairline.1 TS is also associated with a consistent neurocognitive profile.2, 3 The cognitive phenotype of TS includes relatively strong verbal IQ but deficits in visuospatial perception and memory, motor abilities, and attentional processes.4
Although social competence is not grossly impaired in TS, specific deficits in aspects of social processing have been identified. In contrast to some cognitive deficits associated with TS, which have been widely researched, the social and emotional difficulties these women face have received relatively little attention.
Section snippets
Psychosocial skills are commonly impaired in Turner’s Syndrome
TS is not characterised by increased risk of psychiatric illness relative to women attending gynaecological clinics or healthy controls. Nonetheless, TS is associated with increased risk of psychosocial difficulties and below-average social competence.3, 5, 6 Girls with TS tend to have fewer friends, to engage in fewer social activities, to have greater attentional and social difficulties, and to withdraw from social interactions more often than do controls.7, 8 Studies of adolescent girls with
Haploinsufficiency and genomic imprinting in TS
In normal women (46,XX), one of the two X-chromosomes is randomly inactivated, although some genes on that chromosome escape inactivation. Two copies of the latter genes are assumed to be required for normal female development. Haploinsufficiency of these genes in women with TS (45,X) is presumed to play a role in determining the TS phenotype.15 Females with mosaic TS (karyotypes other than the “pure” 45,X) typically demonstrate a more variable phenotype than 45,X women.16, 17, 18 A
Core emotion and face processing deficits may underlie the difficulties women with TS experience in social settings
Sociocognitive processes such as emotion recognition and gaze have been reported as aberrant in the TS population. Lawrence et al.’s study of 45,Xm women revealed statistically (but not clinically) significant impairment in face recognition, irrespective of depressed performance intelligence quotient (PIQ) score.27 This finding supports earlier work identifying facial recognition and “fear” and “surprise” recognition deficits in adolescents and young women of mixed TS karyotype.28 Lawrence et
The neuroanatomical substrate of emotion processing may be abnormal in Turner’s Syndrome
The amygdala has a crucial role in social cognition and, particularly, the processing of emotionally salient visual information.37 Kluver and Bucy’s seminal studies of primates after bilateral temporal lobectomy showed strikingly inappropriate behaviour in social contexts and a greatly diminished fear response to the extent that the term “psychic blindness” was applied to the behaviour.39 More recent primate and human studies, with lesions more confined to the amygdala, were able to dissociate
The amygdala: functional asymmetry and Turner’s Syndrome
Studies in people with unilateral amygdalar damage suggest that the left and right amygdalae differ in their function, with the right amygdala dominant in the autonomic response to emotionally salient stimuli, and the left amygdala dominant in the cognitive processes triggered by such stimuli.52 The proposal for a laterality effect in amygdalar function is strengthened by evidence from the TS literature. Amongst Skuse et al.’s healthy controls, better recognition of fearful facial expressions
A disorder umbrella for these deficits?
Much discussion has attempted to unify the neuroanatomical, endocrine, sociocognitive and neuropsychological abnormalities evident in girls and women with TS.2, 4, 26 Strong parallels have been drawn between the non-verbal impairments in TS and in autism, with the risk of autism increased 200 times in women with TS and X-monosomy common to both women with TS and healthy men.53 There is also an argument for a protective role of the paternal X-chromosome in sociocognitive disorders. Males, by
Summary
Social and emotional difficulties exist in the TS population and at times prove clinically significant, above and beyond the well-described cognitive difficulties experienced in TS. The presence of specific deficits in elements of social cognition such as fearful facial emotion processing, gaze estimation, and the attribution of mental states in TS are reminiscent of autism, a disorder which shares genetic, neuroanatomical, and cognitive characteristics. That the maternally-derived X chromosome
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Cited by (32)
Turner Syndrome: transition from childhood to adolescence
2018, Metabolism: Clinical and ExperimentalFace perception in women with Turner syndrome and its underlying factors
2016, NeuropsychologiaCitation Excerpt :Some structural imaging studies show greater amygdalar volumes in TS (Good et al., 2003; Kesler et al., 2004a but see Cutter, Daly, Robertson, et al., 2006). Areas connected to the amygdala such as the right hippocampus, orbitofrontal cortex and superior temporal sulcus show reduced volume in TS (Burnett et al., 2010; Hong et al., 2011). In addition, fMRI studies that have probed the role of the amygdala in TS emotional processing have found aberrant patterns of amygdalar activation in response to fearful stimuli.
Turner syndrome: From birth to adulthood
2015, Endocrinologia y NutricionMouse model systems to study sex chromosome genes and behavior: Relevance to humans
2014, Frontiers in NeuroendocrinologyCitation Excerpt :Turner syndrome is associated with cognitive deficits, including problems with visuospatial perception and memory, emotionality, and attention (Skuse, 2005; Skuse et al., 2005). Girls with Turner syndrome also have reduced social competence and facial recognition (Hong et al., 2011; Lawrence et al., 2003), and may be at higher risk for autism (Burnett et al., 2010; Marco and Skuse, 2006). Using a tracking task that required increasing amounts of attention, Beaton and colleagues (Beaton et al., 2010) examined BOLD patterns in normal and Turner syndrome girls.
Cortical thickness correlates of socioemotional difficulties in adults with Turner syndrome
2014, PsychoneuroendocrinologyA review on sex differences in processing emotional signals
2012, NeuropsychologiaCitation Excerpt :Both demonstrate decrements in face and affect recognition (Skuse et al., 1997). The deficits in TS co-exist with neuro-anatomical abnormalities of the amygdala and other regions implicated in social processing (for a review, see Burnett, Reutens, & Wood, 2010). Sex differences in brain structure are well-documented, although not necessarily consistent.