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Is that me or my twin? Lack of self-face recognition advantage in identical twins.

Martini M, Bufalari I, Stazi MA, Aglioti SM - PLoS ONE (2015)

Bottom Line: Results show that twins equally recognize their own face and their twin's face.We speculate that in monozygotic twins, the visual representation of the self-face overlaps with that of the co-twin.Thus, to distinguish the self from the co-twin, monozygotic twins have to rely much more than control participants on the multisensory integration processes upon which the sense of bodily self is based.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, University of Rome "La Sapienza," Via dei Marsi 78, 00185 Rome, Italy; IRCCS Fondazione Santa Lucia, Via Ardeatina 306, 00100 Rome, Italy; Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Carrer del Rosselló, 149, 08036 Barcelona, Spain; School of Psychology, University of East London, Water Lane, Stratford, London E15 4LZ, United Kingdom.

ABSTRACT
Despite the increasing interest in twin studies and the stunning amount of research on face recognition, the ability of adult identical twins to discriminate their own faces from those of their co-twins has been scarcely investigated. One's own face is the most distinctive feature of the bodily self, and people typically show a clear advantage in recognizing their own face even more than other very familiar identities. Given the very high level of resemblance of their faces, monozygotic twins represent a unique model for exploring self-face processing. Herein we examined the ability of monozygotic twins to distinguish their own face from the face of their co-twin and of a highly familiar individual. Results show that twins equally recognize their own face and their twin's face. This lack of self-face advantage was negatively predicted by how much they felt physically similar to their co-twin and by their anxious or avoidant attachment style. We speculate that in monozygotic twins, the visual representation of the self-face overlaps with that of the co-twin. Thus, to distinguish the self from the co-twin, monozygotic twins have to rely much more than control participants on the multisensory integration processes upon which the sense of bodily self is based. Moreover, in keeping with the notion that attachment style influences perception of self and significant others, we propose that the observed self/co-twin confusion may depend upon insecure attachment.

No MeSH data available.


Related in: MedlinePlus

Face recognition indices.A) Results of separated repeated measures ANOVAs on Face Recognition performance (normalized inverse efficiency scores (IE), y-axis) scores are represented for both Twins (violet line) and Control (green line) participants as a function of observed Face Identity (x-axis). B) Results of mixed-model ANOVA comparing Twins (violet line) and Control (green line) Face Recognition performance (normalized inverse efficiency scores (IE) for mediated Twins faces; y-axis) as a function of Face Orientation (x-axis). Means and standard errors (SE) are represented. Asterisks indicate significant differences from Newman-Keuls post-hoc comparisons.
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pone.0120900.g002: Face recognition indices.A) Results of separated repeated measures ANOVAs on Face Recognition performance (normalized inverse efficiency scores (IE), y-axis) scores are represented for both Twins (violet line) and Control (green line) participants as a function of observed Face Identity (x-axis). B) Results of mixed-model ANOVA comparing Twins (violet line) and Control (green line) Face Recognition performance (normalized inverse efficiency scores (IE) for mediated Twins faces; y-axis) as a function of Face Orientation (x-axis). Means and standard errors (SE) are represented. Asterisks indicate significant differences from Newman-Keuls post-hoc comparisons.

Mentions: Results of the repeated measure ANOVA in the Twin group showed a main effect of Orientation (F1,19 = 95.441, p = 0.000; η2 = 0.834) with better performance in recognizing Upright (mean ± SD: 0.068 ± 0.013) with respect to Inverted face stimuli (0.047 ± 0.021; p = 0.000). Also, a main effect of Identity was found (F2,38 = 22.929, p = 0.000; η2 = 0.547) with similar performance in recognizing the self (0.052 ± 0.018) and the co-twin’s (0.051 ± 0.016) faces, which were both different from the friend face (0.07±0.018) (both comparisons, p = 0.000) (Fig. 2A, upper panel). No significant interaction between the two factors was found (F2,38 = 0.296; p = 0.746).


Is that me or my twin? Lack of self-face recognition advantage in identical twins.

Martini M, Bufalari I, Stazi MA, Aglioti SM - PLoS ONE (2015)

Face recognition indices.A) Results of separated repeated measures ANOVAs on Face Recognition performance (normalized inverse efficiency scores (IE), y-axis) scores are represented for both Twins (violet line) and Control (green line) participants as a function of observed Face Identity (x-axis). B) Results of mixed-model ANOVA comparing Twins (violet line) and Control (green line) Face Recognition performance (normalized inverse efficiency scores (IE) for mediated Twins faces; y-axis) as a function of Face Orientation (x-axis). Means and standard errors (SE) are represented. Asterisks indicate significant differences from Newman-Keuls post-hoc comparisons.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4390198&req=5

pone.0120900.g002: Face recognition indices.A) Results of separated repeated measures ANOVAs on Face Recognition performance (normalized inverse efficiency scores (IE), y-axis) scores are represented for both Twins (violet line) and Control (green line) participants as a function of observed Face Identity (x-axis). B) Results of mixed-model ANOVA comparing Twins (violet line) and Control (green line) Face Recognition performance (normalized inverse efficiency scores (IE) for mediated Twins faces; y-axis) as a function of Face Orientation (x-axis). Means and standard errors (SE) are represented. Asterisks indicate significant differences from Newman-Keuls post-hoc comparisons.
Mentions: Results of the repeated measure ANOVA in the Twin group showed a main effect of Orientation (F1,19 = 95.441, p = 0.000; η2 = 0.834) with better performance in recognizing Upright (mean ± SD: 0.068 ± 0.013) with respect to Inverted face stimuli (0.047 ± 0.021; p = 0.000). Also, a main effect of Identity was found (F2,38 = 22.929, p = 0.000; η2 = 0.547) with similar performance in recognizing the self (0.052 ± 0.018) and the co-twin’s (0.051 ± 0.016) faces, which were both different from the friend face (0.07±0.018) (both comparisons, p = 0.000) (Fig. 2A, upper panel). No significant interaction between the two factors was found (F2,38 = 0.296; p = 0.746).

Bottom Line: Results show that twins equally recognize their own face and their twin's face.We speculate that in monozygotic twins, the visual representation of the self-face overlaps with that of the co-twin.Thus, to distinguish the self from the co-twin, monozygotic twins have to rely much more than control participants on the multisensory integration processes upon which the sense of bodily self is based.

View Article: PubMed Central - PubMed

Affiliation: Department of Psychology, University of Rome "La Sapienza," Via dei Marsi 78, 00185 Rome, Italy; IRCCS Fondazione Santa Lucia, Via Ardeatina 306, 00100 Rome, Italy; Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Carrer del Rosselló, 149, 08036 Barcelona, Spain; School of Psychology, University of East London, Water Lane, Stratford, London E15 4LZ, United Kingdom.

ABSTRACT
Despite the increasing interest in twin studies and the stunning amount of research on face recognition, the ability of adult identical twins to discriminate their own faces from those of their co-twins has been scarcely investigated. One's own face is the most distinctive feature of the bodily self, and people typically show a clear advantage in recognizing their own face even more than other very familiar identities. Given the very high level of resemblance of their faces, monozygotic twins represent a unique model for exploring self-face processing. Herein we examined the ability of monozygotic twins to distinguish their own face from the face of their co-twin and of a highly familiar individual. Results show that twins equally recognize their own face and their twin's face. This lack of self-face advantage was negatively predicted by how much they felt physically similar to their co-twin and by their anxious or avoidant attachment style. We speculate that in monozygotic twins, the visual representation of the self-face overlaps with that of the co-twin. Thus, to distinguish the self from the co-twin, monozygotic twins have to rely much more than control participants on the multisensory integration processes upon which the sense of bodily self is based. Moreover, in keeping with the notion that attachment style influences perception of self and significant others, we propose that the observed self/co-twin confusion may depend upon insecure attachment.

No MeSH data available.


Related in: MedlinePlus