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Self-Motion Illusion Measures - Coggle Diagram
Self-Motion Illusion Measures
compley, largely subjective pehenomenon
reported self-motion illusion per stimulus type (vection reports or binary vection)
Vection onset time (or vection latency)
when a moving external stimulus suddenly appears stationary and an illusory self.-motion phase oocurs
use subjective scales when accessing the strength of the perceived self-motion or the compelligness of body displacement
intensity: strength of the illusion, compellingness: direction, force analogy
compellingness (convincingness) of a body displacement in a
particular direction
strength and compellingness highly correlated, but only if clear directional cues are present
intensity: continuous assessment using a joystick or a lever
vection onset and duration can also be determined like this
caution: assessing subjective experience is dependent on reference frame
relative to moving stimulus or ground of laboratory
objective measures
dissociation between conscious awareness of environmental situation and subconscious motor control
variety of psychophysical measurment techniques
magnitude of perceived displacmeent
self-motion velocity
illusory body tilt
several more indirect measures
threshold for object motion detection is higher when vection is stronger
perception of visually induced self-motion modulates time-to-collision judgements
temporal order judgements task
behavioural
head and body displacement
body sway
amplitude tend to increase with strength of vection sensation
postural sway - complex and equipment-intensive procedure
force platforms, body mounted accelerometers, or video methods
important to combine postural cues with subjective account of sensation: responses to both perceptual and cognitive self-motion cues
physiological correlates
Nystagmus, part of VOR
often accompanies, but vection can be perceived in the absence of nystagmus (and vice versa)
Nystagmus might not categorize objectively
afternystagmus as a stronger, more reliable indicator
electrodermal activity and cardiovascular responses
large individual differences,
dependent upon individual stereotypes and differences in the somatosensory and vestibular contributions to autonomic regulation
Neural correlates
optokinetic stimulation inhibits vestibular areas
similar brain areas are de-activated during linear or roll vection types
target objects as cues, position relative to landmarks, cognitive plausibility
motion sickness, full body illusions and pain perception
acoustic landmark?
vection onset, vection build up,
convincingness
reduce motion after-effects
natural and relaxed, no fixation, as this could supress nystagmoid eye movements
audiokinetic reflex