盲人建构陌生环境空间表征的策略及其作用

空间表征对于盲人定向行走具有重要意义。以往研究者集中探讨早期视觉经验缺失对于盲人空间表征的影响, 较少探究空间表征建构的过程性因素, 即探路策略对于盲人空间表征的影响。本研究采用现场实验的方法探究了盲人建构陌生环境空间表征采用的策略及其作用。结果发现：视觉经验缺失对盲人陌生环境空间表征能力造成了不利影响, 然而, 被试运用有效的策略可以弥补视觉缺失带来的损失, 且利用空间关系策略的个体所建构的空间表征更为精确, 定向行走效率也更高。

The process of construction of spatial representation in the unfamiliar environment in the blind: The role of strategies and its effect

Spatial representation is the spatial images of object location and spatial relationships in the mind. Since the work of Tolman, numerous cognitive psychology studies have been conducted to examine the formation of spatial representation and underlying mechanisms in people having visual experiences. In relation to those have visual experiences, blind people may rely more upon precisely constructed spatial representation, which can help them with orientation and navigation in the absence of their vision. However, previous studies on spatial representation of blind people were mainly conducted in laboratories. It remains relatively unclear how blind people encode unfamiliar spatial stimuli and construct spatial representation in real-life situations. This study used field experiment to investigate the characteristics of blind persons’ spatial representation in an unfamiliar environment. It focused on exploring navigation process, namely the impact of wayfinding strategy on knowledge acquisition of spatial representation. Participants were 26 congenitally totally blind persons, 29 adventitiously totally blind ones, and 25 sighted ones. All participants were voluntarily recruited from a special education school. The results showed that the spatial representation of most congenitally blind participants was characterized by a route representation in large-scale space, while most adventitiously blind and sighted participants exhibited a survey representation. Congenitally blind participants were found to use different strategies for constructing spatial representation. Through the use of a spatial relationship strategy, congenitally blind participants performed as well as adventitiously blind and sighted ones in the construction of spatial representation. The current data found no gender effect on spatial representation in an unfamiliar environment. In parallel with findings from neurobiological studies, this study demonstrated that lack of visual experiences adversely influenced the ability of blind people’s spatial representation. However, utilization of appropriate strategies may mitigate such impairing effect of blindness. This study also found an association between spatial representation and walking efficiency. Blind persons who were better at constructing spatial representation walked faster and were less likely to take wrong paths. This study adds to the literature by adopting filed experiment to explore strategies used by blind people for constructing spatial representation in real-life environments. Our findings could inform professionals on how to more effectively provide blind people with appropriate orientation and modality trainings, which may in turn have a positive impact on their social engagement and life quality.