000			02493nam a22003017a 4500
005			20250710091744.0
008			250710b ph ||||| |||| 00| 0 eng d
022			_a0002-9556
040			_cOCT
100			_aCruz-Sanchez, Karla
240			_aAJP : The american journal of psychology / _hFall 2024
245			_aDifferential response to acute stressors in firstborn compared with lastborns siblings as measured by facial inafred thermography / _cKarla Cruz-Sanchez, Luis Enrique Juarez, Jose Alfredo Zepeda, Christophe Feron, Amando Bautista, Robyn Hudson, Veronica Reyes-Meza
300			_aVol 137 (3) pages 321-331 : _billustrations ; _c28 cm
500			_aFor many mammals, siblings are an important part of the developmental environment, probably contributing to the formation of individual differences in personality. Specifically, in humans sibling effects are thought to be associated with birth order. However, the findings have been controversial. This might be due in part to the use of self-report methods, which depend on subjective perceptions. Thus, it is necessary to also use physiological measures not under voluntary control. We tested the behavioral and physiological responses of 80 young adults—40 men and 40 women, 20 firstborn and 20 lastborn of each sex—to 3 commonly used psychological stressors during a 13-min experimental session. Participants' behavioral responses were recorded on video, and their physiological reactions were registered via facial infrared thermography. As predicted by birth order theory, firstborns showed significantly greater signs of stress than lastborns, with lower nose temperatures on all tests and for both sexes. Behavior did not differ between the 2 groups. Thus, contradictory findings among previous studies of the association of birth order with personality differences between siblings might be partly due to the low resolution of behavioral evaluation in contrast to the registration of autonomic nervous system activity as, for example, measured by noninvasive, easily implemented facial infrared thermography.
650			_asibling
650			_abirth order
650			_apersonality
650			_astress
650			_abehavioral evaluation
650			_afacial thermography
700			_aJuarez, Luis Enrique
700			_aZepeda, Jose Alfredo
700			_aFeron, Christophe
700			_aBautista, Amando
700			_aHudson, Robyn
700			_aReyes-Meza, Veronica
942			_2ddc _cCR _n0
999			_c10367 _d10367