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The processing of faces across non-rigid facial transformation develops at 7 month of age: a fNIRS-adaptation study.

Kobayashi M, Otsuka Y, Kanazawa S, Yamaguchi MK, Kakigi R - BMC Neurosci (2014)

Bottom Line: In addition, we revealed that size-invariant processing of facial identity develops by 5 months of age (NR 23:984-988, 2012), while view-invariant processing develops around 7 months of age (FiHN 5:153, 2011).The aim in the current study was to examine whether infants' brains process facial identity across the non-rigid transformation of facial features by using the neural adaptation paradigm.Our results suggest that the processing of facial identity with non-rigid facial transformation develops around 7 months after birth.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Integrative Physiology, National Institute for Physiological Sciences, 38 Nishigo-Naka, Myodaiji, Okazaki, Aichi 444-8585, Japan. megumik@nips.ac.jp.

ABSTRACT

Background: Using near-infrared spectroscopy (NIRS), our previous neural adaptation studies found that infants' bilateral temporal regions process facial identity (FiHN 5:153, 2011). In addition, we revealed that size-invariant processing of facial identity develops by 5 months of age (NR 23:984-988, 2012), while view-invariant processing develops around 7 months of age (FiHN 5:153, 2011). The aim in the current study was to examine whether infants' brains process facial identity across the non-rigid transformation of facial features by using the neural adaptation paradigm. We used NIRS to compare hemodynamic changes in the bilateral temporal areas of 5- to 6-month-olds and 7- to 8-month-olds during presentations of an identical face and of different faces.

Results: We found that (1) the oxyhemoglobin concentration around the T5 and T6 positions increased significantly during the presentation of different faces only in 7- to 8-month-olds and (2) 7- to 8-month-olds, but not 5- to 6-month-olds, showed attenuation in these channels to the presentation of the same face rather than to the presentation of different faces, regardless of non-rigid changes in facial features.

Conclusions: Our results suggest that the processing of facial identity with non-rigid facial transformation develops around 7 months after birth.

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Related in: MedlinePlus

The time courses of oxy-Hb concentration in 5- to 6-month-olds (A and B) and 7- to 8-month-olds (C and D). The time course of the oxy-Hb concentration in the bilateral temporal areas obtained from the 12 channels for each hemisphere under the different-face condition (the black line) and the same-face condition (the gray line) in 5- to 6-month-olds (A and B) and 7- to 8-month-olds (C and D). Zero on the horizontal axis represents the beginning of the test period, and 10 represent the end of the test period.
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Figure 1: The time courses of oxy-Hb concentration in 5- to 6-month-olds (A and B) and 7- to 8-month-olds (C and D). The time course of the oxy-Hb concentration in the bilateral temporal areas obtained from the 12 channels for each hemisphere under the different-face condition (the black line) and the same-face condition (the gray line) in 5- to 6-month-olds (A and B) and 7- to 8-month-olds (C and D). Zero on the horizontal axis represents the beginning of the test period, and 10 represent the end of the test period.

Mentions: Figure 1 shows the time course of the average oxy-Hb concentration in the bilateral temporal areas obtained from 12 channels for each hemisphere under the different-face condition (the black line) and same-face condition (the gray line). In 7- to 8-month-olds, increases of oxy-Hb concentration in the different-face condition occurred at about 3 s after the beginning of the test trial, and the decrease occurred after the end of the test trial (Figure 1C and D). In contrast to the oxy-Hb changes, the deoxy-Hb changes in both temporal areas increased in the same-face condition rather than the different-face condition. 5- to 6-month-olds did not show any changes in either condition compared to the baseline (Figure 1A and B).


The processing of faces across non-rigid facial transformation develops at 7 month of age: a fNIRS-adaptation study.

Kobayashi M, Otsuka Y, Kanazawa S, Yamaguchi MK, Kakigi R - BMC Neurosci (2014)

The time courses of oxy-Hb concentration in 5- to 6-month-olds (A and B) and 7- to 8-month-olds (C and D). The time course of the oxy-Hb concentration in the bilateral temporal areas obtained from the 12 channels for each hemisphere under the different-face condition (the black line) and the same-face condition (the gray line) in 5- to 6-month-olds (A and B) and 7- to 8-month-olds (C and D). Zero on the horizontal axis represents the beginning of the test period, and 10 represent the end of the test period.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4230271&req=5

Figure 1: The time courses of oxy-Hb concentration in 5- to 6-month-olds (A and B) and 7- to 8-month-olds (C and D). The time course of the oxy-Hb concentration in the bilateral temporal areas obtained from the 12 channels for each hemisphere under the different-face condition (the black line) and the same-face condition (the gray line) in 5- to 6-month-olds (A and B) and 7- to 8-month-olds (C and D). Zero on the horizontal axis represents the beginning of the test period, and 10 represent the end of the test period.
Mentions: Figure 1 shows the time course of the average oxy-Hb concentration in the bilateral temporal areas obtained from 12 channels for each hemisphere under the different-face condition (the black line) and same-face condition (the gray line). In 7- to 8-month-olds, increases of oxy-Hb concentration in the different-face condition occurred at about 3 s after the beginning of the test trial, and the decrease occurred after the end of the test trial (Figure 1C and D). In contrast to the oxy-Hb changes, the deoxy-Hb changes in both temporal areas increased in the same-face condition rather than the different-face condition. 5- to 6-month-olds did not show any changes in either condition compared to the baseline (Figure 1A and B).

Bottom Line: In addition, we revealed that size-invariant processing of facial identity develops by 5 months of age (NR 23:984-988, 2012), while view-invariant processing develops around 7 months of age (FiHN 5:153, 2011).The aim in the current study was to examine whether infants' brains process facial identity across the non-rigid transformation of facial features by using the neural adaptation paradigm.Our results suggest that the processing of facial identity with non-rigid facial transformation develops around 7 months after birth.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Integrative Physiology, National Institute for Physiological Sciences, 38 Nishigo-Naka, Myodaiji, Okazaki, Aichi 444-8585, Japan. megumik@nips.ac.jp.

ABSTRACT

Background: Using near-infrared spectroscopy (NIRS), our previous neural adaptation studies found that infants' bilateral temporal regions process facial identity (FiHN 5:153, 2011). In addition, we revealed that size-invariant processing of facial identity develops by 5 months of age (NR 23:984-988, 2012), while view-invariant processing develops around 7 months of age (FiHN 5:153, 2011). The aim in the current study was to examine whether infants' brains process facial identity across the non-rigid transformation of facial features by using the neural adaptation paradigm. We used NIRS to compare hemodynamic changes in the bilateral temporal areas of 5- to 6-month-olds and 7- to 8-month-olds during presentations of an identical face and of different faces.

Results: We found that (1) the oxyhemoglobin concentration around the T5 and T6 positions increased significantly during the presentation of different faces only in 7- to 8-month-olds and (2) 7- to 8-month-olds, but not 5- to 6-month-olds, showed attenuation in these channels to the presentation of the same face rather than to the presentation of different faces, regardless of non-rigid changes in facial features.

Conclusions: Our results suggest that the processing of facial identity with non-rigid facial transformation develops around 7 months after birth.

Show MeSH
Related in: MedlinePlus