Related Experiment Videos
Visual evoked potentials are affected by trunk rotation in neglect patients
1Dipartimento di Psicologia, Universita degli studi di Roma La Sapienza Rome, Italy.
Neuroreport
|January 31, 1996
Summary
Visuo-spatial neglect patients show delayed visual evoked potentials (VEPs) in the left visual field. Body rotation normalized VEPs, suggesting neck afferents may influence neglect and visual processing.
Area of Science:
- Neuroscience
- Visual Perception
- Cognitive Psychology
Background:
- Unilateral visuo-spatial neglect is a cognitive disorder affecting spatial awareness.
- Visual evoked potentials (VEPs) measure visual pathway activity.
- The role of body posture in neglect is not fully understood.
Purpose of the Study:
- To investigate the effect of body rotation on VEPs in patients with visuo-spatial neglect.
- To explore the potential influence of neck proprioception on visual processing in neglect.
Main Methods:
- Recorded steady-state and transient VEPs in four neglect patients stimulating left and right hemifields.
- Compared VEP latencies under standard conditions versus with body turned left.
- Included a control group of patients with left brain damage but no neglect.
Main Results:
- Left hemifield VEPs were delayed in the standard condition for neglect patients.
- Body rotation to the left normalized VEP latencies between hemifields.
- Trunk rotation did not affect VEPs in patients without neglect.
Conclusions:
- Neck muscle sensory afferents may modulate occipital activity in neglect.
- Body positioning, potentially via neck afferents, can influence VEPs and visuo-spatial neglect.
- Findings suggest a link between somatosensory input and visual processing deficits in neglect.