Depth Perception
Depth Cues: Their influences on the Strength of the Ponzo Illusions
By Harry Smith
To: Vanessa. L. Bates
Abstract:
The aim of this experiment was to investigate the relationship between the number of depth cues and the influential extent this would have on the Ponzo illusion. The hypothesis being that as the number of type of depth cues increased the participants overestimation of the altered stimulus would increase. 28 participants studying Psychology Course 11 at Otago University took part in this experiment as they were presented with six different types of depth cues, ten times for each type. There were two different types of stimuli, horizontal line and truck. The measured variable was the length of the altered stimulus as a percentage relative to the referenced stimulus. During the experiment participants had to change the length of the altered stimuli until it matched the length of the referenced stimulus. The percentage of altered stimulus compared to the references stimuli was then recorded for each participant. Results showed that as the depth cues increased the percentage of altered stimuli in comparison to the referenced stimulus also increased. The hypothesis was thus supported as the number and type of depth cues in the illusions increased, causing the participants estimates of the stimulus length to also increase.
Depth perception is the internal mechanism used by people for perceiving objects relative distance or location within their visual field, and it allows people to see in three dimensions. We perceive depth using different depth cues, sources of information that signal the distance from the observer to the distal stimulus. (Gleitman, Gross and Resiburg 2010). The first type of cue that allows people to perceive depth is binocular cue. When we use our vision both of our eyes look out into the world from a slightly different position this causes each eye to have a slightly different view; this difference in view between the
By Harry Smith
To: Vanessa. L. Bates
Abstract:
The aim of this experiment was to investigate the relationship between the number of depth cues and the influential extent this would have on the Ponzo illusion. The hypothesis being that as the number of type of depth cues increased the participants overestimation of the altered stimulus would increase. 28 participants studying Psychology Course 11 at Otago University took part in this experiment as they were presented with six different types of depth cues, ten times for each type. There were two different types of stimuli, horizontal line and truck. The measured variable was the length of the altered stimulus as a percentage relative to the referenced stimulus. During the experiment participants had to change the length of the altered stimuli until it matched the length of the referenced stimulus. The percentage of altered stimulus compared to the references stimuli was then recorded for each participant. Results showed that as the depth cues increased the percentage of altered stimuli in comparison to the referenced stimulus also increased. The hypothesis was thus supported as the number and type of depth cues in the illusions increased, causing the participants estimates of the stimulus length to also increase.
Depth perception is the internal mechanism used by people for perceiving objects relative distance or location within their visual field, and it allows people to see in three dimensions. We perceive depth using different depth cues, sources of information that signal the distance from the observer to the distal stimulus. (Gleitman, Gross and Resiburg 2010). The first type of cue that allows people to perceive depth is binocular cue. When we use our vision both of our eyes look out into the world from a slightly different position this causes each eye to have a slightly different view; this difference in view between the
References: Colombo, C (2013 March 6-10) Pattern Perception. Lecture presented in Psychology 111, University of Otago Gleitman, H., Gross, J., & Reisburg, D. (2010). Psychology (8th ed.). New York: W.W. Norton & Company, Inc. Laboratory Manual: Psychology 111/112 (2013). Dunedin: Department of Psychology, University of Otago Sternberg, R.J. (1998). In search of the human mind (2nd ed.). Fort Worth, TX: Harcourt Brace & Company. (Pgs. 98-108)