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Retinotopic organisation of cortical mechanisms responsive to colour: evidence from patient studies

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Retinotopic organisation of cortical mechanisms responsive to colour : evidence from patient studies. / Morland, A B; Ruddock, K H.

In: Acta psychologica, Vol. 97, No. 1, 1997, p. 7-24.

Research output: Contribution to journalArticle

Harvard

Morland, AB & Ruddock, KH 1997, 'Retinotopic organisation of cortical mechanisms responsive to colour: evidence from patient studies', Acta psychologica, vol. 97, no. 1, pp. 7-24.

APA

Morland, A. B., & Ruddock, K. H. (1997). Retinotopic organisation of cortical mechanisms responsive to colour: evidence from patient studies. Acta psychologica, 97(1), 7-24.

Vancouver

Morland AB, Ruddock KH. Retinotopic organisation of cortical mechanisms responsive to colour: evidence from patient studies. Acta psychologica. 1997;97(1):7-24.

Author

Morland, A B ; Ruddock, K H. / Retinotopic organisation of cortical mechanisms responsive to colour : evidence from patient studies. In: Acta psychologica. 1997 ; Vol. 97, No. 1. pp. 7-24.

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@article{de97ca9acfe34d26bd801280afa45bee,
title = "Retinotopic organisation of cortical mechanisms responsive to colour: evidence from patient studies",
abstract = "This paper deals with the visual responses of three patients who have impaired colour vision consequent on cortical dysfunction which, in two of them, is associated with demonstrable neuronal damage. The studies to be described are concerned particularly with the spatial attributes of their chromatic response mechanisms. Data are presented which establish that a hemianope GY has coarse chromatic discrimination for large stimuli located within his 'blind' hemifield. GY responds to stimuli containing differently coloured equiluminant components as if the coloured components were averaged over the whole field and it is speculated that such spatial averaging may correspond to the process which, in normal vision, provides compensation for change of illuminant in order to achieve colour constancy. Colour constancy is impaired in a second patient, BL, who has cortical lesions involving the lingual and fusiform gyri, areas which are partially spared in GY. It is shown that movement, but not colour, presented to GY's normal hemifield generates a response localised in his blind hemifield and disinhibitory interaction between movement and colour is illustrated for a patient MW, in whom colour chromatic stimuli generate spreading inhibition of visual responses. This inhibitory interaction is propagated between widely separated stimuli, including those which are located on opposite sides of the vertical meridian. We discuss these experimental results in relation to anatomical and physiological mechanisms of the primate visual cortex.",
keywords = "Adult, Color Perception, Hemianopsia, Humans, Male, Middle Aged, Retina, Visual Acuity, Visual Fields",
author = "Morland, {A B} and Ruddock, {K H}",
year = "1997",
language = "English",
volume = "97",
pages = "7--24",
journal = "Acta psychologica",
issn = "0001-6918",
publisher = "Elsevier",
number = "1",

}

RIS (suitable for import to EndNote) - Download

TY - JOUR

T1 - Retinotopic organisation of cortical mechanisms responsive to colour

T2 - evidence from patient studies

AU - Morland, A B

AU - Ruddock, K H

PY - 1997

Y1 - 1997

N2 - This paper deals with the visual responses of three patients who have impaired colour vision consequent on cortical dysfunction which, in two of them, is associated with demonstrable neuronal damage. The studies to be described are concerned particularly with the spatial attributes of their chromatic response mechanisms. Data are presented which establish that a hemianope GY has coarse chromatic discrimination for large stimuli located within his 'blind' hemifield. GY responds to stimuli containing differently coloured equiluminant components as if the coloured components were averaged over the whole field and it is speculated that such spatial averaging may correspond to the process which, in normal vision, provides compensation for change of illuminant in order to achieve colour constancy. Colour constancy is impaired in a second patient, BL, who has cortical lesions involving the lingual and fusiform gyri, areas which are partially spared in GY. It is shown that movement, but not colour, presented to GY's normal hemifield generates a response localised in his blind hemifield and disinhibitory interaction between movement and colour is illustrated for a patient MW, in whom colour chromatic stimuli generate spreading inhibition of visual responses. This inhibitory interaction is propagated between widely separated stimuli, including those which are located on opposite sides of the vertical meridian. We discuss these experimental results in relation to anatomical and physiological mechanisms of the primate visual cortex.

AB - This paper deals with the visual responses of three patients who have impaired colour vision consequent on cortical dysfunction which, in two of them, is associated with demonstrable neuronal damage. The studies to be described are concerned particularly with the spatial attributes of their chromatic response mechanisms. Data are presented which establish that a hemianope GY has coarse chromatic discrimination for large stimuli located within his 'blind' hemifield. GY responds to stimuli containing differently coloured equiluminant components as if the coloured components were averaged over the whole field and it is speculated that such spatial averaging may correspond to the process which, in normal vision, provides compensation for change of illuminant in order to achieve colour constancy. Colour constancy is impaired in a second patient, BL, who has cortical lesions involving the lingual and fusiform gyri, areas which are partially spared in GY. It is shown that movement, but not colour, presented to GY's normal hemifield generates a response localised in his blind hemifield and disinhibitory interaction between movement and colour is illustrated for a patient MW, in whom colour chromatic stimuli generate spreading inhibition of visual responses. This inhibitory interaction is propagated between widely separated stimuli, including those which are located on opposite sides of the vertical meridian. We discuss these experimental results in relation to anatomical and physiological mechanisms of the primate visual cortex.

KW - Adult

KW - Color Perception

KW - Hemianopsia

KW - Humans

KW - Male

KW - Middle Aged

KW - Retina

KW - Visual Acuity

KW - Visual Fields

M3 - Article

VL - 97

SP - 7

EP - 24

JO - Acta psychologica

JF - Acta psychologica

SN - 0001-6918

IS - 1

ER -