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Parvocellular layer
Parvocellular layer 4 superficial layers of the Lateral Geniculate Nucleus. Small neurons, termination sight of midget ganglion cells.
RELATED TERMS--------------------------------------
Lateral
Toward the side, sideways.
Nucleus
Plural: nuclei. The compartment of a cell that contains the chromosomes.
Termination
The act of ending or concluding. In psychotherapy, termination refers to the mutual agreement between patient and therapist to bring therapy to an end. The idea of termination often occurs to both, but usually it is the therapist who introduces the subject into the session as a possibility to be considered. In psychoanalytic treatment, the patient's reactions are worked through to completion before the treatment ends. The early termination that is characteristic of focal psychotherapy and other forms of brief psychotherapy often requires more extensive work with the feelings of loss and separation.
Ganglion
A cluster of nerve cells.
SIMILAR TERMS--------------------------------------
Parvocellular pathway
Pathway that begins with the midget (parvo) ganglion cells in the retina and terminates within the parvocellular layer of the LGN. Conduction slower than that of Magnocellular Pathway.
Parvovirus
May cause an arthritis in adults (females mainly) and behaves like rubella. Causes erythema infectiosum (Fifth disease or 'slapped cheek syndrome') in children.
PREVIOUS AND NEXT TERMS--------------------------------------
Primitive reflexes
The reflexes that every baby is born with, including the rooting, sucking, startle, and grasp reflexes.
Prolapsed cord
In one of every 300 or so births, the umbilical cord slips out through the cervix ahead of the baby, which is dangerous because uterine contractions block blood flow to the baby. Unless the cervix is already dilated and birth is imminent, cesarean delivery is the usual solution.
Prolonged labor
When labor does not progress to vaginalbirth after 18 hours.
Puerperium
The period from the third stage of labor through the uterus's recovery after childbirth.
Purgative
A purging medicine; something that cleanses or purges the body (via the bowels) of an unwanted substance.
Parvocellular layer
Palinopsia
Literally 'seeing again'; Is a form of visual perseveration. It refers to reappearance of an image after some time when the original external stimulus is no longer available. Neural basis of palinopsia is unknown but many palinopsia patients have some right-hemisphere disturbances.
Parvocellular pathway
Pathway that begins with the midget (parvo) ganglion cells in the retina and terminates within the parvocellular layer of the LGN. Conduction slower than that of Magnocellular Pathway.
Pattern adaptation
The perceived width and orientation of a grating pattern can be altered by first adapting to grating pattern of different frequencies and orientations. After adapting the contrast sensitivity to stimuli near the frequency or orientation of the adapting pattern is reduced. Suggests the existence of neurons tuned for frequency and orientation at are fatigued by the adapting pattern.
Perceptive field
Area of the retina or visual space that when stimulated by a visual stimulus produces a change in behavioral response.
Perceptual constancy
The phenomenon that the perception of an object remains constant despite changes in the its size, lighting conditions and orientation.
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