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At least 19 recordsLinked to original sources

Pattern detection by mongol and non-mongol subnormals.

Ten mongols and ten clinically heterogeneous subnormals matched on chronological age, mental age and digit span took part in an experiment in which tape-recorded supra-span digit sequences with different patterns were presented. There were six patterns: random, mirror (e.g. 583385); same-digit pairs (e.g. 558833), same-digit throughout (e.g. 333333), couplet repetition (e.g. 585858) and triplet repetition (583583). The numbers of digits correctly recalled in any order by the mongols in the various conditions ranked from least to most were: random, mirror, same-digit pairs, same-digit messages, triplet repetition and couplet repetition. The rank order for the non-mongols was the same except that the positions of couplet and triplet repetition were reversed. Mongols had significantly poorer recall for random, mirror and same-digit pair messages than non-mongols but were their equals in other conditions. The mongols' performance was more sensitive to pattern than the performance of the other subjects. There was some evidence that, in the messages with same-digit pairs and the same digit throughout, all subjects (but mongols in particular) tended to insert new digits into the response sequence and that the digit introduced was the next one in simple arithmetic progression. It would appear that the hypothesis about poor auditory-vocal channelling capacities of mongols needs qualification.

Adult↗

[Clinical psychological studies on adolescent and adult mongols (author's transl)].

A group of 20 mongol adolescents and adults with an average age of 19 years was strictly parallelized with a group of 20 brain-damaged adolescents and adults of other diagnostic groups with respect to age and intelligence level (average age 19 and average intelligence 50.65--52.90). The hypothesis of a possible deterioration of performance and personality was checked with the following battery of tests: Hamburg-Wechsler intelligence test for adults, the motoricity test according to Walther and the Rorschach experiment. The average difference in the sub-tests of HAWIE primarily emphasize the psycho-organic disturbance in visual-motor coordination, which is seen to a much greater extent in mongols than in non-mongols. The significant difference in completing pictures indicates an intensification of psycho-organicity. In agreement with the observations of WUNDERLICH, the psychomotoricity of the mongols is significantly slower and less adroit than the psychomotoricity of non-mongol oligophrenias. Non-significant differences in the psycho-organic sign (P%, F+%) in disfavor the mongols were seen in the Rorschach experiment. Factorial analysis distinguished the two groups very clearly. In the three most important factors, the mongol group showed stronger signs of psycho-organicity and weak mental performance associated with an intensified neuroticism factor compared with the brain-damage oligophrenia group of other diagnostic origin.

Adolescent↗

The chromosome abnormality in mongolism.

In an examination of our present knowledge regarding chromosome anomalies in mongolism the anomalies of trisomy-21 (the commonest anomaly in association with mongolism), 13-15/21 translocation and 21-22/21 translocation were illustrated and discussed. The relatively uncommon chromosome translocations and chromosome mosaicisms found in association with mongolism have especial clinical importance. Translocation of either type may occur as an isolated finding in a mongoloid patient. However, the translocation chromosome is frequently also found in one of the phenotypically normal parents. This is associated with an increased incidence of mongolism in the offspring, though the actual risk figure is uncertain in view of the small number of families described to date. The occurrence of chromosome mosaicism in mongolism may be associated with incomplete manifestation of the syndrome, and the ultimate mental development in such patients has varied from normal to severely retarded in cases described in the literature.

Chromosome Aberrations↗

Discrimination of size, form and order in mongol and other mentally handicapped children.

136 mongol, 129 non-mongol subnormal and 152 normal children were tested in a series of experiments to determine visual discrimination and perceptual skills in size, form and order. An attempt was made to demonstrate possible differences in strategies and behaviour in the groups, particularly in the mongol group. It was shown that, in spite of contrary impressions arising from results of normal standardised tests, in these three groups matched on M.A., there was no significant difference in performance when extraneous developmental factors were eliminated. The literature relating to this is discussed. There was further support for the existing experimental evidence that poor short-term memory for visual stimuli in terms of size, form and order is a characteristic weakness of subnormal groups. No relationship was found between M.A. and visual perceptual tasks in any group; supporting the theory that perceptual skills develop independently. A peculiar phenomenon was discovered in the mongol group significant enough to warrant further investigation, viz. a distinctive form of perseveration and a related and clearly marked tendency to order reversal. Suggestions are made and possible reasons presented for this, but, at this stage, without experimental backing.

Down Syndrome↗