不同时相日光下颜色的恒常性

一、前言 在光源光谱成份改变的条件下,我们周围物体的颜色在眼睛看来保持相对不变,称为颜色恒常性。1807年Thomas Young首先描述了颜色恒常性现象,他指出室内不管是由蜡烛的黄光或火焰的红光来照明的,书页纸仍然看来是白色的。Young认为,外界某一表面的颜色外观,并不完全决定于网膜的红、绿、蓝三种感受器的吸收特性,而也依赖于周围其它物体射入眼睛的光通量。此后,E.Hering对颜色恒常性做了实验表演。一般认为颜色恒常性是对环境照明感受性的降低。视觉通道只传递由物体表面所反射的光谱成     

Seeking help from a female friend: Girls' competencies,friendship features,and intentions

Adolescent girls frequently manage problems by seeking help from friends. We examined girls' intentions of seeking help from a female friend and whether these intentions were related to their competencies (emotional competence, self‐disclosure) directly and/or indirectly via specific friendship features (companionship, closeness). Participants included 222 Canadian girls (Grades 9–12) who completed an anonymous survey at school. Results showed that girls had high intentions of seeking help from a female friend and that higher self‐disclosure competence was linked directly to higher intentions. Both competencies were linked indirectly to higher intentions mediated by friendship features. These findings indicate that competencies make help seeking by girls from girls likely in multiple ways and suggest how coping programs can address help seeking in girl–girl friendships.