project:brain_hacking:proprioreceptive_illusions
Differences
This shows you the differences between two versions of the page.
project:brain_hacking:proprioreceptive_illusions [2011/10/03 14:48] – created ata | project:brain_hacking:proprioreceptive_illusions [2011/10/03 15:05] (current) – ata | ||
---|---|---|---|
Line 1: | Line 1: | ||
+ | === Proprioreceptive illusions | ||
+ | Sense of body movement and position in space | ||
+ | |||
+ | * Muscle spindle -passive, static, & dynamic muscle stretch | ||
+ | |||
+ | | ||
+ | |||
+ | * Goldi tendon organs -tendon | ||
+ | |||
+ | {{http:// | ||
+ | |||
+ | * Joint receptors are fast-adapting and signal joint angle | ||
+ | |||
+ | | ||
+ | |||
+ | == Tendon and spindle model == | ||
+ | [[http:// | ||
+ | |||
+ | |||
+ | ==Proprioreceptive ilusions == | ||
+ | * In the absence of movement & visual feedback, the perceived location of our hand may ' | ||
+ | * This drift may be due to the information available from proprioception degrading over time | ||
+ | *usefull for WILD and OOBE project | ||
+ | |||
+ | * Vibrating the tendons of a muscle (at about 100-120Hz) mimics signals arising from normal muscle stretch | ||
+ | * This can ' | ||
+ | *pics body parts vibration treesholds and receptor frequenci sensitivity | ||
+ | |||
+ | {{http:// | ||
+ | |||
+ | {{http:// | ||
+ | |||
+ | **Various vibrations inducted illusions** | ||
+ | |||
+ | For example, vibration | ||
+ | of the biceps brachii of the arm leads to the forearm feeling more extended than it | ||
+ | actually is . | ||
+ | When **postural muscles are vibrated, various illusions of body motion can be | ||
+ | elicited**. For example, simultaneous vibration of the Achilles tendons of a standing | ||
+ | subject restrained in position will cause the subject to experience forward pivoting | ||
+ | in pitch about the ankles. The subject, if in total darkness, will exhibit nystagmoid | ||
+ | eye movements with the slow phase compensatory for the direction of apparent | ||
+ | self-displacement. If a visual target is presented for the subject to fixate, it will | ||
+ | be seen to move in the direction of apparent self-motion and to displace ahead of | ||
+ | the subject in the same direction . Thus, the visual target | ||
+ | motion has the same characteristics as the oculogyral illusion described above, | ||
+ | and a similar physiological explanation in terms of suppression of involuntary eye | ||
+ | movements can account for its properties. | ||
+ | **Vibration of neck muscles leads to illusions of head rotation and displacement** | ||
+ | **In fact, with vibration of the appropriate skeletal muscles, apparent motion and | ||
+ | displacement of the body or its segments can be elicited in virtually any desired | ||
+ | configuration**. If visual or auditory targets are present, their positions | ||
+ | also are remapped in the direction of apparent body motion and displacement. | ||
+ | For example, when a small target light is attached to the hand and illusory motion | ||
+ | of the restrained forearm is elicited by vibration of the biceps brachii or triceps | ||
+ | muscles, the target light will be seen to displace physically in the direction of | ||
+ | the apparent motion of the hand. This phenomenon is known as the oculobrachial | ||
+ | illusion . | ||
+ | |||
+ | {{http:// | ||
+ | {{http:// | ||
+ | |||
+ | |||
+ | **Pinocchio’s Effect** | ||
+ | | ||
+ | | ||
+ | | ||
+ | | ||
+ | |||
+ | |||
+ | |||
+ | **Propriroceptive laterization** | ||
+ | |||
+ | The nondominant arm (the left for most people) was better at matching positions. Furthermore, | ||
+ | with the difficulty of the task.When visual cues were provided. As expected, the dominant arm excelled, but when only proprioception was allowed, the nondominant arm won every time. | ||
+ | |||