T Zabłocka

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The effects of ablation of the superior colliculus-pretectum on a previously elaborated object discrimination task were compared in cats reared in normal conditions, in cats reared in the laboratory, and in cats deprived of patterned vision. The normally reared cats were least deficient postoperatively, whereas deprived cats were most deficient. Seven of 8(More)
Four cats deprived binocularly of pattern vision (BD cats), 4 control cats reared also in the laboratory (C cats), and 4 normal wild cats (N cats) were trained to discriminate gratings of progressively smaller difference in orientation. Differences in learning were found only in fine orientation discriminations. The stage of 15 degrees orientation(More)
Fifteen laboratory born cats were used: seven binocularly deprived, four reared under condition of daily alternating monocular exposure and four controls. At the 7th month of age four of the binocularly deprived cats and all the remaining cats were trained monocularly in a two choice apparatus. In the first stage of training the cats learned a test with the(More)
We used binocularly deprived cats (BD cats), control cats reared in the laboratory with open eyes (C cats) and normal wild cats (N cats). In stage 1, the cats were trained to discriminate a black ping-pong ball and a 3-dimensional cross of the same size and color for food reward. The BD cats learned slower than N cats. The difference between BD cats and C(More)
Three groups of cats were used: cats deprived binocularly of patterned vision from birth (BD cats), control cats reared in the laboratory with opened eyes (C cats) and cats reared in a rural environment during the first months of life (N cats). The cats were trained to discriminate vertical vs. horizontal oscillations of a light spot for food reward. The(More)
Pattern discrimination learning was compared in three groups of cats: reared in normal conditions, reared in the laboratory with opened eyes, and deprived of patterned vision from birth. A four-choice apparatus without partitions was used. The figure of a disc was reinforced with food, whereas a cross, triangle and square were not. All groups reached(More)
Visual fields were measured in 4 binocularly deprived cats and 2 controls. The animals were tested monocularly in the area between 60 degrees contralateral to the open eye and 105 degrees ipsilateral. No difference was found between visually deprived and control cats in response to stimuli presented in the binocular segment of the visual field from 30(More)
A two-choice apparatus for food reward was used. Normal and visually deprived cats were trained to discriminate white and black cards. After the animals had reached criterion, the contrast difference between the cards was diminished in steps. When the brightness ratio had been reduced to 1.8, discrimination was impaired in the deprived cats and not in the(More)
Pattern discrimination learning was compared in cats reared in a normal environment during the first months of life (N cats), control cats reared in the laboratory with opened eyes (C cats), and cats deprived binocularly of patterned vision from birth (BD cats). A two-choice apparatus was used for training. In Expt. I the cats had been trained without a(More)
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