Contrast sensitivity and orientation selectivity in lamina IV of the striate cortex of Old World monkeys

Michael Hawken, A. J. Parker

Research output: Contribution to journalArticle

Abstract

Contrast sensitivity and orientation selectivity were measured for neurons in lamina IV of macque striate cortex. Contrast sensitivity was determined for a range of spatial frequencies, using a staircase method. The stimuli were at the optimal orientation, direction and speed of drift for each neuron. The assignment of each recording site to a subdivision of lamina IV was made by histological reconstruction of each electrode penetration from sections reacted for cytochrome oxidase and stained for Nissl substance. Neurons in the magnocellular recipient zone of IVc (IVcα) have high contrast sensitivities, while those in the parvocellular recipient zone (IVcβ) have low contrast sensitivities. Both of the upper subdivisions of lamina IV (IVa and IVb) contain a mixture of neurons with high and low contrast sensitivities. There were orientation selective neurons within all subdivisions of lamina IV, even in IVc, whereas non-oriented neurons were found only in those subdivisions that receive a direct parvocellular geniculate input (IVa and IVcβ).

Original languageEnglish (US)
Pages (from-to)367-372
Number of pages6
JournalExperimental Brain Research
Volume54
Issue number2
StatePublished - 1984

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Cercopithecidae
Contrast Sensitivity
Visual Cortex
Neurons
Electron Transport Complex IV
Spinal Cord Dorsal Horn
Electrodes

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Contrast sensitivity and orientation selectivity in lamina IV of the striate cortex of Old World monkeys. / Hawken, Michael; Parker, A. J.

In: Experimental Brain Research, Vol. 54, No. 2, 1984, p. 367-372.

Research output: Contribution to journalArticle

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