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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 and center position detection task in Experiment 2. Error bars indicate standard errors.
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Figure 4: Percentage of correct responses for the front direction detection task and center position detection task in Experiment 2. Error bars indicate standard errors.

Mentions: Prior to the analyses, the trials where RTs exceeded 10 s were removed as outliers (0.54% of the trials in the direction detection task and 0.24% in the position detection task). Figure 4 shows the percentage of correct responses in the front direction detection task and in the center position detection task. We conducted an ANOVA on task performance with task (direction task vs. position task) and image structure (normal vs. transposed) as independent variables. The main effects of task and image structure was not significant, task: F(1,20) = 0.16, p = 0.60, image structure: F(1,20) = 2.96, p = 0.10. Importantly, the interaction was significant, F(1,20) = 10.88, p = 0.003, = 0.35. This interaction showed that egocentric direction perception performance was higher in the normal image condition than in the transposed image condition, p = 0.001, whereas egocentric position perception performance was not significantly different between two image conditions, p = 0.12.


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 and center position detection task in Experiment 2. Error bars indicate standard errors.
© Copyright Policy
Related In: Results  -  Collection

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

Figure 4: Percentage of correct responses for the front direction detection task and center position detection task in Experiment 2. Error bars indicate standard errors.
Mentions: Prior to the analyses, the trials where RTs exceeded 10 s were removed as outliers (0.54% of the trials in the direction detection task and 0.24% in the position detection task). Figure 4 shows the percentage of correct responses in the front direction detection task and in the center position detection task. We conducted an ANOVA on task performance with task (direction task vs. position task) and image structure (normal vs. transposed) as independent variables. The main effects of task and image structure was not significant, task: F(1,20) = 0.16, p = 0.60, image structure: F(1,20) = 2.96, p = 0.10. Importantly, the interaction was significant, F(1,20) = 10.88, p = 0.003, = 0.35. This interaction showed that egocentric direction perception performance was higher in the normal image condition than in the transposed image condition, p = 0.001, whereas egocentric position perception performance was not significantly different between two image conditions, p = 0.12.

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