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首页> 外文期刊>Vision Research: An International Journal in Visual Science >Influences of visual pitch and visual yaw on visually perceived eye level (VPEL) and straight ahead (VPSA) for erect and rolled-to-horizontal observers.
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Influences of visual pitch and visual yaw on visually perceived eye level (VPEL) and straight ahead (VPSA) for erect and rolled-to-horizontal observers.

机译：视线俯仰和偏航对直立和滚动水平观察者的视觉感知水平（VPEL）和笔直向前（VPSA）的影响。

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Localization within the space in front of an observer can be specified along two orthogonal physical dimensions: elevation ('up', 'down') and horizontal ('left','right'). For the erect observer, these correspond to egocentric dimensions along the long and short axes of the body, respectively. However, when subjects are rolled-to-horizontal (lying on their sides), the correspondence between the physical and egocentric dimensions is reversed. Employing egocentric coordinates, localization can be referred to a central perceptual point-visually perceived eye level (VPEL) along the long axis of the body, and visually perceived straight ahead (VPSA) along the short axis of the body. In the present experiment, measurements of VPEL and of VPSA were made on each of eight subjects who were either erect or rolled-to-horizontal while monocularly viewing a long 2-line stimulus (two parallel, 64 degrees -long lines separated by 50 degrees ) in otherwise complete darkness that was centered on the eye of the observer and was tilted out of the frontoparallel plane by a variable amount and direction (from -30 degrees to +30 degrees in 10 degrees steps). The stimulus tilt was either around an axis through the center of the two eyes (pitch; VPEL was measured) or around the long axis of the body that passed through the center of the viewing eye (yaw; VPSA was measured). Large variations in the localization settings were measured that were systematic with stimulus tilt. The slopes of the functions plouing the deviations from veridicality against the orientation of the 2-line stimulus ('induction functions') were larger for the rolled-to-horizontal observer than for the erect observer for both VPEL and VPSA, and for a given body orientation were larger for the VPEL discrimination than for the VPSA discrimination; the influences of body orientation in physical space and the direction of the discrimination relative to the body were lineraly additive. Both the y-intercepts of the induction functions and the central perceptual point measured in complete darkness were lower when the norm setting by the subject was along the vertical than when it was along the horizontal; this held for both the VPEL and VPSA discriminations. The systematic effects of body orientation on the slopes and of line orientation on the y-intercepts and dark values result from an effect of gravity on the settings and fit well to a general principle: any departure from erect posture increases the induction effects of the visual stimulus. The effect of gravity is consistent with the effect of gravity in previous work in high-g environments with the VPEL discrimination.
机译：可以沿着两个正交的物理尺寸指定观察者前方空间内的定位：高程（“上”，“下”）和水平（“左”，“右”）。对于直立的观察者，这些分别对应于沿着身体长轴和短轴的以自我为中心的尺寸。但是，当对象滚动到水平位置（侧卧）时，物理尺寸和自我中心尺寸之间的对应关系会相反。利用以自我为中心的坐标，可以将定位称为沿身体长轴的中央感知点-视觉感知的眼睛水平（VPEL），以及沿身体短轴的视觉感知向前的直线（VPSA）。在本实验中，对八个直立或水平滚动的受试者进行了VPEL和VPSA的测量，同时单眼观察了一条长的2线刺激（两条平行的64度长线，相隔50度） ）在其他完全黑暗的环境中，以观察者的眼睛为中心，并以不同的量和方向（从-30度到+30度以10度的步长）倾斜于平行平行平面之外。刺激倾斜是围绕穿过两只眼睛中心的轴（俯仰;已测量VPEL）或围绕穿过观察眼睛中心的身体的长轴（偏航;已测量VPSA）。测量了本地化设置中的大变化，这些变化是随着刺​​激倾斜而系统化的。对于VPEL和VPSA以及给定的给定值，对于水平滚动观察者来说，使垂直偏差偏离2线刺激方向的函数的斜率（“归纳函数”）要比垂直观察者大。 VPEL歧视的身体取向大于VPSA歧视的身体取向;人体在物理空间中的朝向和相对于人体的辨别方向的影响是线性叠加的。当对象的标准设置沿垂直方向时，归纳函数的y截距和在完全黑暗中测得的中心知觉点均低于水平方向;这对VPEL和VPSA都适用。重力对设置的影响会导致身体取向对坡度的直线影响以及线取向对y截距和暗值的影响，并很好地符合一般原理：任何偏离直立姿势的行为都会增加视觉效果刺激。引力的影响与先前的工作在高克环境中具有VPEL判别力的引力一致。

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