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Numbsense of shape, texture, and objects after left parietal infarction: A case report.
Keisuke Hanada1,2, Kayoko Yokoi3, Akinori Futamura4
1Department of Rehabilitation, Suishokai Murata Hospital, Osaka City, Osaka, Japan.
Journal of Neuropsychology
|October 17, 2020
Summary
Patients with numbsense can detect touch stimuli without conscious awareness, a phenomenon previously observed on the body. This study reports numbsense involving recognition of touched objects after brain injury.
Area of Science:
- Neuroscience
- Cognitive Psychology
- Sensory Perception
Background:
- Numbsense describes detecting somatosensory stimuli above chance levels without conscious perception.
- Previous cases focused on tactile localization on the patient's own body.
Observation:
- A patient with left parietal infarction exhibited numbsense.
- The patient demonstrated impaired conscious recognition of most somatosensory stimuli.
Findings:
- Despite impaired recognition, the patient could correctly identify the shape, texture, and type of touched objects.
- This indicates a dissociation between sensory detection and conscious object recognition.
Implications:
- Suggests distinct neural pathways for sensory processing and conscious awareness of external objects.
- Highlights the complexity of somatosensory processing and its disruption after focal brain injury.
- Offers insights into the neural basis of object recognition and tactile perception.
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