Postcentral neurons with covert receptive fields in conscious macaque monkeys: Their selective responsiveness to simultaneous two-point stimuli applied to discrete oral portions

Takashi Toda, Miki Taoka

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

The representation of the oral structures in the postcentral somatosensory cortex was studied in conscious macaque monkeys by recording the activity of single neurons. A total of 2,807 neurons were isolated in the oral regions of three hemispheres in two animals. Of these, 375 neurons (area 3a, 3; area 3b, 123; area 1, 99; area 2, 150) lacked an apparent receptive field (RF), and their relative frequency was significantly higher in area 2 (19%) than in more rostral areas (area 3a, 8%; area 3b, 10%; area 1, 12%). We tested the responsiveness of these neurons to stimuli applied simultaneously to two discrete, but functionally related, oral structures (interstructural two-point stimuli: iTPS). Neurons in areas 3a, 3b, and 1 that lacked an apparent RF were not responsive to iTPS. However, 35 neurons in area 2 responded stably to iTPS applied to either of the following sets of oral structures: the tongue and incisors (n = 18), incisors and lip (n = 9), lip and tongue (n = 12), or upper and lower lips (n = 8). Of them, 19 neurons were activated during self-movements such as tongue protrusion, lip licking, and food manipulation. The neurons selectively responsive to iTPS might detect converging inputs from different oral structures and play a pivotal role in detecting objects straddling different oral structures and the mutual contact of oral structures.

Original languageEnglish
Pages (from-to)303-306
Number of pages4
JournalExperimental Brain Research
Volume168
Issue number1-2
DOIs
Publication statusPublished - 2006 Jan

Keywords

  • Hierarchy
  • Oral representation
  • Oral stereognosis
  • Postcentral somatosensory cortex
  • Somesthetic convergence

ASJC Scopus subject areas

  • Neuroscience(all)

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