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The dorsal columns of the spinal cord are a major source of haptic (sense of active touch) and proprioceptive input to the brainstem and sensory-motor cortex. Following injury in primates, there are impairments in two-point discrimination, direction of movement across the skin, and frequency of vibration, and qualitative control of the digits, but simple spatial discriminations recover. In the rat...
Rats are capable of reaching for food with a single forelimb, but since they locate the target of their reach using olfaction, it is unclear how they adjust their limb movement to compensate for errors. Although it is thought that their reaching movement is ballistic and can only be adjusted by trial and error, whether they can use haptic cues to aid in locating and identifying a target has not been...
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