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Egocentric Direction and Position Perceptions are Dissociable Based on Only Static Lane Edge Information.

Nakashima R, Iwai R, Ueda S, Kumada T - Front Psychol (2015)

Bottom Line: Experiment 1 examined the effect of the "uprightness factor" using normal and inverted road images.Experiment 2 examined the effect of the "central vision factor" using normal and transposed road images where the upper half of the normal image was presented under the lower half.Experiment 3 aimed to replicate the results of Experiments 1 and 2.

View Article: PubMed Central - PubMed

Affiliation: RIKEN Brain Science Institute-TOYOTA Collaboration Center, RIKEN Wako, Japan.

ABSTRACT
When observers perceive several objects in a space, at the same time, they should effectively perceive their own position as a viewpoint. However, little is known about observers' percepts of their own spatial location based on the visual scene information viewed from them. Previous studies indicate that two distinct visual spatial processes exist in the locomotion situation: the egocentric position perception and egocentric direction perception. Those studies examined such perceptions in information rich visual environments where much dynamic and static visual information was available. This study examined these two perceptions in information of impoverished environments, including only static lane edge information (i.e., limited information). We investigated the visual factors associated with static lane edge information that may affect these perceptions. Especially, we examined the effects of the two factors on egocentric direction and position perceptions. One is the "uprightness factor" that "far" visual information is seen at upper location than "near" visual information. The other is the "central vision factor" that observers usually look at "far" visual information using central vision (i.e., foveal vision) whereas 'near' visual information using peripheral vision. Experiment 1 examined the effect of the "uprightness factor" using normal and inverted road images. Experiment 2 examined the effect of the "central vision factor" using normal and transposed road images where the upper half of the normal image was presented under the lower half. Experiment 3 aimed to replicate the results of Experiments 1 and 2. Results showed that egocentric direction perception is interfered with image inversion or image transposition, whereas egocentric position perception is robust against these image transformations. That is, both "uprightness" and "central vision" factors are important for egocentric direction perception, but not for egocentric position perception. Therefore, the two visual spatial perceptions about observers' own viewpoints are fundamentally dissociable.

No MeSH data available.


Related in: MedlinePlus

Percentage of correct responses for the front direction detection task (egocentric direction perception) and center position detection task (egocentric position perception) in Experiment 1. Error bars indicate standard errors.
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Figure 3: Percentage of correct responses for the front direction detection task (egocentric direction perception) and center position detection task (egocentric position perception) in Experiment 1. Error bars indicate standard errors.

Mentions: Prior to the analyses, the trials where RTs exceeded 10 s were removed as outliers (0.28% of the trials in the direction detection task and 0.26% in the position detection task). Although we manipulated the viewing positions in the direction detection task/viewings direction in the position detection task, we analyzed the data collapsed over the conditions, because this manipulation was not our main purpose. Figure 3 shows the percentage of correct responses in the front direction detection task (i.e., egocentric direction perception) and in the center position detection task (i.e., egocentric position perception). We conducted an analysis of variance (repeated measures ANOVA) on task performance, with the two factors of task (direction task vs. position task) and image structure (normal vs. inverted) as independent variables. The main effect of the task was marginally significant, F(1,20) = 3.41, p = 0.08, = 0.14, indicating that the performance was better in the direction task than in the position task. The main effect of image structure was not significant, F(1,20) = 1.25, p = 0.28, = 0.06. Importantly, the interaction was significant, F(1,20) = 5.48, p = 0.03, = 0.22. This interaction indicated that egocentric direction perception performance was better in the normal image condition than in the inverted image condition, p = 0.03, whereas egocentric position perception performance was not different between in the normal image condition than in the inverted image condition, p = 0.50.


Egocentric Direction and Position Perceptions are Dissociable Based on Only Static Lane Edge Information.

Nakashima R, Iwai R, Ueda S, Kumada T - Front Psychol (2015)

Percentage of correct responses for the front direction detection task (egocentric direction perception) and center position detection task (egocentric position perception) in Experiment 1. Error bars indicate standard errors.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4663249&req=5

Figure 3: Percentage of correct responses for the front direction detection task (egocentric direction perception) and center position detection task (egocentric position perception) in Experiment 1. Error bars indicate standard errors.
Mentions: Prior to the analyses, the trials where RTs exceeded 10 s were removed as outliers (0.28% of the trials in the direction detection task and 0.26% in the position detection task). Although we manipulated the viewing positions in the direction detection task/viewings direction in the position detection task, we analyzed the data collapsed over the conditions, because this manipulation was not our main purpose. Figure 3 shows the percentage of correct responses in the front direction detection task (i.e., egocentric direction perception) and in the center position detection task (i.e., egocentric position perception). We conducted an analysis of variance (repeated measures ANOVA) on task performance, with the two factors of task (direction task vs. position task) and image structure (normal vs. inverted) as independent variables. The main effect of the task was marginally significant, F(1,20) = 3.41, p = 0.08, = 0.14, indicating that the performance was better in the direction task than in the position task. The main effect of image structure was not significant, F(1,20) = 1.25, p = 0.28, = 0.06. Importantly, the interaction was significant, F(1,20) = 5.48, p = 0.03, = 0.22. This interaction indicated that egocentric direction perception performance was better in the normal image condition than in the inverted image condition, p = 0.03, whereas egocentric position perception performance was not different between in the normal image condition than in the inverted image condition, p = 0.50.

Bottom Line: Experiment 1 examined the effect of the "uprightness factor" using normal and inverted road images.Experiment 2 examined the effect of the "central vision factor" using normal and transposed road images where the upper half of the normal image was presented under the lower half.Experiment 3 aimed to replicate the results of Experiments 1 and 2.

View Article: PubMed Central - PubMed

Affiliation: RIKEN Brain Science Institute-TOYOTA Collaboration Center, RIKEN Wako, Japan.

ABSTRACT
When observers perceive several objects in a space, at the same time, they should effectively perceive their own position as a viewpoint. However, little is known about observers' percepts of their own spatial location based on the visual scene information viewed from them. Previous studies indicate that two distinct visual spatial processes exist in the locomotion situation: the egocentric position perception and egocentric direction perception. Those studies examined such perceptions in information rich visual environments where much dynamic and static visual information was available. This study examined these two perceptions in information of impoverished environments, including only static lane edge information (i.e., limited information). We investigated the visual factors associated with static lane edge information that may affect these perceptions. Especially, we examined the effects of the two factors on egocentric direction and position perceptions. One is the "uprightness factor" that "far" visual information is seen at upper location than "near" visual information. The other is the "central vision factor" that observers usually look at "far" visual information using central vision (i.e., foveal vision) whereas 'near' visual information using peripheral vision. Experiment 1 examined the effect of the "uprightness factor" using normal and inverted road images. Experiment 2 examined the effect of the "central vision factor" using normal and transposed road images where the upper half of the normal image was presented under the lower half. Experiment 3 aimed to replicate the results of Experiments 1 and 2. Results showed that egocentric direction perception is interfered with image inversion or image transposition, whereas egocentric position perception is robust against these image transformations. That is, both "uprightness" and "central vision" factors are important for egocentric direction perception, but not for egocentric position perception. Therefore, the two visual spatial perceptions about observers' own viewpoints are fundamentally dissociable.

No MeSH data available.


Related in: MedlinePlus