Objective: Emotion processing is known to be mediated by a complex network of cortical and subcortical regions with evidence of specialized hemispheric lateralization within the brain. In light of prior evidence indicating that lateralization of cognitive functions (such as language) may depend on normal visual development, we investigated whether the lack of prior visual experience would have an impact on the development of specialized hemispheric lateralization in emotional processing. Method: We addressed this issue by comparing performance in early blind and sighted controls on a dichotic listening task requiring the detection of specific emotional vocalizations (i.e., suggestive of happiness or sadness) presented independently to either ear. Results: Consistent with previous studies, we found that sighted individuals showed enhanced detection of positive vocalizations when presented in the right ear (i.e., processed within the left hemisphere) and negative vocalizations when presented in the left ear (i.e., right hemisphere). It is interesting to note that although blind individuals were as accurate as sighted controls in detecting the valance of the vocalization, performance was not consistent with any pattern of specialized hemispheric lateralization. Conclusions: Overall, these results suggest that although the lack of prior visual experience may not lead to impaired emotion processing performance, the underlying neurophysiological substrate (i.e., degree of special hemispheric lateralization) may depend on normal visual development.

Gamond, L., Vecchi, T., Ferrari, C., Merabet, L., Cattaneo, Z. (2017). Emotion processing in early blind and sighted individuals. NEUROPSYCHOLOGY, 31(5), 516-524 [10.1037/neu0000360].

Emotion processing in early blind and sighted individuals

GAMOND, LUCILE;FERRARI, CHIARA;CATTANEO, ZAIRA
Ultimo
2017

Abstract

Objective: Emotion processing is known to be mediated by a complex network of cortical and subcortical regions with evidence of specialized hemispheric lateralization within the brain. In light of prior evidence indicating that lateralization of cognitive functions (such as language) may depend on normal visual development, we investigated whether the lack of prior visual experience would have an impact on the development of specialized hemispheric lateralization in emotional processing. Method: We addressed this issue by comparing performance in early blind and sighted controls on a dichotic listening task requiring the detection of specific emotional vocalizations (i.e., suggestive of happiness or sadness) presented independently to either ear. Results: Consistent with previous studies, we found that sighted individuals showed enhanced detection of positive vocalizations when presented in the right ear (i.e., processed within the left hemisphere) and negative vocalizations when presented in the left ear (i.e., right hemisphere). It is interesting to note that although blind individuals were as accurate as sighted controls in detecting the valance of the vocalization, performance was not consistent with any pattern of specialized hemispheric lateralization. Conclusions: Overall, these results suggest that although the lack of prior visual experience may not lead to impaired emotion processing performance, the underlying neurophysiological substrate (i.e., degree of special hemispheric lateralization) may depend on normal visual development.
Articolo in rivista - Articolo scientifico
Blindness; Dichotic listening; Emotions; Lateralization; Plasticity
English
2017
31
5
516
524
none
Gamond, L., Vecchi, T., Ferrari, C., Merabet, L., Cattaneo, Z. (2017). Emotion processing in early blind and sighted individuals. NEUROPSYCHOLOGY, 31(5), 516-524 [10.1037/neu0000360].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/152346
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