owning the body in the mirror: the effect of visual perspective and mirror view on the full-body ill

owning the body in the mirror: the effect of visual perspective and mirror view on the full-body illusion - how to make a cardboard display stand

by:SAFEKA      2019-08-24
owning the body in the mirror: the effect of visual perspective and mirror view on the full-body illusion  -  how to make a cardboard display stand
The mirror allows us to look at our bodies from a third angle. person (observer)perspective.
However, compared to the true third, observe how you affect the performance of the central body through a mirror
Do not fully understand the views of people.
In a series of experiments, multiple senses
Body illusion is used to regulate the sense of ownership of the human model from a third perspective
Through the mirror, look at people from a third point of view
The perspective of people without mirrors, from
Human perspective
In contrastmirror third-
At the same time, the students' actual physical contact and the model's appearance in The Mirror have caused a strong sense of ownership of the model and the threat of improving the physiological response of the human body, which is equivalent to asynchronous (non-ownership)
Control conditions.
The subjective report of ownership of the human model viewed through the mirror is statistically equivalent to the first batch.
Illusion of human perspective
These findings show that the mirror has a special role in observing the self.
The results also support the importance of a self-centered reference framework for body ownership and indicate that mirror reflections of one's own body are associated with personal space, which allows the central body representation to be updated. Twenty-
4 Participants
13 female 11 male)
The average age is 27 years (rangeu2009=u200919–42)
Participated in the first experiment.
All participants are normal or correctedto-
Normal vision, no history of mental illness (self-reported)
And give written informed consent.
All the experiments were conducted in accordance with the Helsinki declaration and were approved by the Swedish central committee for ethical review.
During the experiment, the participants wore a set
Installed Display (HMDs)(VR1280;
Aptos virtual research systems, California, USA)
The view is 60 ° and the display resolution is 1280 × 1024.
During the experiment, a male and a female shop mannequin was used to make videos and as props. A stick (Length of 92 cm)
There is a polystyrene sphere at the end (
Diameter 6 cm)
Used to convey touch.
The ownership questionnaire used to quantify the subjective strength of ownership illusion is based on previous studies and delivered through HMDs.
Display images of human models under different conditions (see )
Video is pre-recorded.
In these videos, the body of a human model is either reflected by a mirror (
From the angle of the head of the human model)
Or watch directly (see the ).
For mirror video, Mirror (
75 cm × 100, including its frame, 62 cm × 87 cm on the reflective surface)
Lean against the wall at the top of the cabinet.
The position of the human model is about 1.
5 m in front of the mirror.
A standard camera tripod is placed on the right side (
Human model perspective)
Human model. A custom-
A weighted metal bracket is installed on the top of the tripod.
This holder projects 15 cm from the top of the tripod to the left and holds two identical cameras (
CamOne Infinity HD, Resolution 1920 u2009 × 1080, Touratech AG, Germany)
The human body model is directly above (
In the position of the eye).
The angle of the camera and mirror is positioned so that the recorded image captures the mirror reflection of the human model from the top of the shoulder to the ankle.
During the experiment, a chair was placed directly behind the mannequin and kept in place.
This chair helps to stabilize the mannequin in a standing position when the video is recorded.
The chairman also pointed out where the participants should stand (
Directly in front of the chair)
, To help participants maintain stability throughout the course of the experiment and act as a mirror prompt (
Participants stood in front of the chair and then saw the same chair in the mirror behind the mannequin).
The tripod can also be seen in the mirror image, so it is also placed in the appropriate position during the experiment to act as a mirror prompt.
The experimenter then touched his torso model with a wooden stick.
During the experiment, the recorded audio prompt is played back to the experimenter through the headset.
The same number of touches were delivered to the left, right and center of the torso.
Each touch lasts about a second, moving down from the bottom of the rib cage until below the waist.
Because the camera is located right above the mannequin, be careful when shooting the video to ensure that no parts of the mannequin or stick are observed during the first shot
The human perspective, the human model and the stick can only be observed in the mirror.
Part of the cabinet can also be seen in the lower part of the mirror, which covers the feet of the human model. In the non-
Mirror videos, mirrors, and cabinets are removed from the field of view and replaced by human models.
Therefore, the camera takes the mannequin from the top of the shoulder to the ankle, similar to the image taken under mirror conditions.
However, the key difference is that in this case, participants seem to look directly at the body of the mannequin rather than seeing the mirror reflection of the mannequin as described above.
In all cases, the touch lasted about 2 minutes from the beginning of the first touch to the end of the last touch.
In addition, for all conditions, the touch applied to the participant corresponds to the touch applied to the human Model I. e.
, The touch on the right side of the participant's torso matches the touch on the right side of the human model's torso.
Because left-
Right reversal of mirror reflection, visually touching the right side of the torso of the mannequin, as if touching the left side of the mannequin.
Sex Love makes separate videos for male and female participants
Matching Human model
The model is wearing blue jeans and a white T-shirt.
Shirt, and remove the head at the neckline to achieve the correct positioning of the camera.
In all the experiments, participants were asked to wear similar clothing, which was followed by most.
Used in the experiment
Participate in design.
Participants, dressed in HMDs, stood in front of models and mirrors, with their heads facing in front of them as if they were looking straight ahead. Each pre-
The recorded video starts with a blank screen of 5 seconds, followed by a 2 minute touch.
In the process of touching, the model is in the mirror or from the third --
Use the appropriate video to watch a person's perspective without a mirror.
For each trial, the experimenter stroked the participant's actual torso based on the same audio prompts used when making the video.
The tips are played through the headphones, so the participants can't hear them.
Under Synchronous conditions, the time to play a clue to the experimenter, and the touch passed to the participant, is the same as the video.
In an asynchronous trial, a 1000-MS delay was applied to audio cues in order for the touch observed in the video and the touch felt to be delivered at different times.
These touches are carried out in unpredictable patterns, although they are split equally between the center, left and right of the torso.
In each case, a total of 60 touches were made.
According to each condition, the questionnaire items are presented in random order through HMDs.
Participants were asked to respond orally, which the experimenter recorded.
All the conditions were attended by each participant (mirror and non-
Mirror of synchronous and asynchronous touch)
The order between participants is balanced.
New queue of 50 participants (
23 males and 27 females)
The average age is 26 years (rangeu2009=u200918–56)
Participated in experiment 2.
As with Experiment 1, all participants were normal or corrected-to-
Normal vision, no history of mental illness (self-reported)
And give written informed consent before participating in the study.
The materials and methods are the same as Experiment 1, except that the questionnaire and skin conductivity response are not used (SCR)
Is using pre-
Establish an agreement.
The SCR measurement is MP150 with Biopac system (Goleta, USA)
, The gain switch is set to 5 mmho/V and the CAL2 scale value is 5.
Connect the electrode to the index finger and middle finger of the participant's left hand using Signa electrode gel (
Parker Lab Ltd.
New Jersey, USA).
Skin conductivity, as a measure of autonomous awakening, is recorded at a rate of 100 samples per second and processed using Windows-oriented Biopac software package acknowdge (ACK100W). Separate pre-
A recorded video was made for experiment 2.
These videos are the same as those used in experiment 1, adding a knife threat and placing a skin conduction sensor on the human model finger.
The knife threat is realized using 33 cm kitchen knife (21u2009cm blade)
, Approaching the body of the human model from the side (
Participant perspective)
In an assassination attemptsee ).
SCR is defined as the peak amplitude that occurs within five seconds of the start of the knife threat, by identifying the maximum conductivity value and then subtracting 5-
The second time frame
In each trial, the experimenter starts recording SCR data by pressing the button when the knife enters the image.
The knife appeared in the image for about two seconds.
Analysis includes all participants;
Therefore, there is no response to the trial (
And empty responder)
Included in the calculation of the SCR magnitude.
The data was collected and analyzed by different experimenters, and the data was extracted by using automatic computer program.
The procedure of Experiment 2 is the same as that of Experiment 1, except for the touch of about 1 minute per trial (
From the beginning of the first touch to the end of the last touch).
In addition, immediately after the touch, the participant observed that the mannequin was threatened by a knife (see above).
Instead of replying to the questionnaire.
According to previous studies, skin conductivity measurements were obtained in a short period of time because of cognitive-
Compared to more automatic physiological responses such as SCR, experiments based on subjective responses require a greater sense of immersion and therefore gain a longer time.
In this experiment, each participant participated in three trials for each case;
The order of these trials is balanced between participants.
New sample of 20 participants (
10 men and 10 women)
The average age is 28 years (rangeu2009=u200918–56)
Participated in the third experiment.
All participants are normal or correctedto-
Normal vision, no history of mental illness (self-reported)
And give written informed consent before participating in the study.
The materials and methods are the same as the experiment one, except for the creation of a new video where the mannequin is from the first one
Human perspective
During the shooting, the camera is placed in the downward position of the human model eye to capture the image of the body from above.
The process of Experiment 3 is the same as Experiment 1, but this time it will mirror the image with the traditional first-
Human perspective of human models.
The participant's body was touched by the stick in time to the audio prompt presented to the experimenter (
Not participants)
Synchronized or asynchronous with the touch delivered to the mannequin (on the pre-recorded video).
After each trial lasted about 2 minutes, the same questionnaire as the experiment was used to quantify the perceived intensity of the body illusion.
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