The Institute of Neurology found that the influence of two coordinate systems on spatial perception
On June 13th, the research group of Zhang Mingsha of the Institute of Neurology, Chinese Academy of Sciences, published an article titled Asymmetric influence of egocentric representation onto allocentric perception in the Journal of Neuroscience, reporting that they discovered through the experimental methods of psychophysics The mechanism of interaction between the two coordinate systems.
Spatial positioning is one of the most important cognitive functions for animal survival. In order to locate the spatial position of an object in the environment, we need to rely not only on the self-centered coordinate system, but also on the center coordinate system of the object. Although we already know that different neural circuits participate in the encoding of spatial information from different spatial coordinate systems, little is known about how they affect each other.
In this study, Zhang Mingsha's research group designed a behavior experiment of location discrimination. The test required healthy subjects to respond to the spatial position of the visual stimulus in the center coordinate system of the object, ignoring its position in the self-center coordinate system. By observing the reaction time of the experimental subjects under the two experimental conditions (compatible and incompatible), they found that the spatial information of the self-centered coordinate system significantly affects the center coordinates of the object in three forms Processing of spatial information: 1. At the same position of the self-centered coordinate system, the processing of spatial information of the object's central coordinate system is significantly faster under compatible conditions than under incompatible conditions; 2. With the spatial position of the object at the self-centered coordinates The farther the system is from the visual center, the perception of the spatial position of the object's center coordinate system becomes slower under incompatible conditions, but basically unchanged under compatible conditions; 3. This effect is significantly greater in the left field of view than in the right field of view.
This paper reported for the first time the effect of the spatial information of the self-centered coordinate system on the processing speed of the spatial information of the object's central coordinate system. In addition, the experimental results also confirmed for the first time at the behavioral level that the right hemisphere receives more input from the same side of the spatial information than the left hemisphere, which also provides a reasonable explanation for the contralateral space neglecting most patients with right brain injury. . In short, the study provides new insights into the spatial perception mechanism of the brain, especially how the brain integrates spatial information from two different coordinate systems, and also provides the detection of diseases neglected in the contralateral space of patients with brain damage. New possible ways.
The subject was completed by PhD student Zhou Yang and research assistant Liu Yining under the guidance of Researcher Zhang Mingsha. The research was supported by the “973†project of the Ministry of Science and Technology, the “Hundred Talents Program†of the Chinese Academy of Sciences, the State Key Laboratory of Neuroscience, and the Shanghai Pujiang Program.
The figure above shows the results of the mean response latency (mean RT) of the 10 subjects. The X-axis represents the position of the visual stimulus in the self-centered coordinate system (L-left; R-right). The Y-axis represents the average response latency (milliseconds). Blue represents the position of the visual stimulus in the object-centered coordinate system to the left, and red represents the position of the visual stimulus in the object-centered coordinate system to the right. The asterisk indicates that the average response latency is significantly different between compatible and incompatible, * P <0.05, ** P <0.01, *** P <0.001.
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