The Cerebral Cortex of Man¶
Penfield, W., & Rasmussen, T. (1950). The Cerebral Cortex of Man: A Clinical Study of Localization of Function.
Cited by¶
2 citations across 2 artifacts.
Each citation links to the sentence it supports in the citing article.
Primes¶
- Topographic Map
- The lesion-implies-deficit signature is the clinical payoff: damage to a contiguous cortical region produces a numb patch on a predictable, contiguous body region, and the size of the sensory deficit scales with that region's magnification — a small lesion in the over-magnified hand area produces a large, behaviourally serious deficit, while the same-sized lesion in trunk cortex barely registers.
This sourceEstablishes the somatotopic organization of cortex and the link between cortical lesions and localized, magnification-scaled sensory deficits.
- The lesion-implies-deficit signature is the clinical payoff: damage to a contiguous cortical region produces a numb patch on a predictable, contiguous body region, and the size of the sensory deficit scales with that region's magnification — a small lesion in the over-magnified hand area produces a large, behaviourally serious deficit, while the same-sized lesion in trunk cortex barely registers.
Domain-specific¶
- Somatotopy
- The canonical instance is primary somatosensory cortex (S1), where the complete body surface is laid out as a continuous but heavily distorted map — Wilder Penfield's "sensory homunculus," derived through direct cortical stimulation in awake neurosurgical patients — in which topological neighbourhoods of the body are preserved while magnification is wildly non-uniform: the lips, tongue, and fingers receive cortical representation grossly disproportionate to their physical area, reflecting their high receptor density and high two-point discrimination acuity, while the torso and proximal limbs are compressed
This sourcePenfield and Rasmussen's sensory homunculus, the canonical S1 body map derived from direct cortical stimulation in awake neurosurgical patients: neighbourhoods of the body preserved, magnification wildly non-uniform, with lips, tongue and fingers enlarged far beyond their physical area and the trunk and proximal limbs compressed.
SupportedVerified against the source
- The canonical instance is primary somatosensory cortex (S1), where the complete body surface is laid out as a continuous but heavily distorted map — Wilder Penfield's "sensory homunculus," derived through direct cortical stimulation in awake neurosurgical patients — in which topological neighbourhoods of the body are preserved while magnification is wildly non-uniform: the lips, tongue, and fingers receive cortical representation grossly disproportionate to their physical area, reflecting their high receptor density and high two-point discrimination acuity, while the torso and proximal limbs are compressed
Verification¶
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