Transformations of consciousness. A cartography. I. The perception-hallucination continuum.

Self-awareness emerges from the evolutionary transformation of material structures into magical, mythical and mental structures of consciousness. Western varieties of conscious states may be mapped on a perception-hallucination continuum of increasing ergotropic or hyper-arousal. These levels of subcortical arousal are cortically or cognitively interpreted as normal, creative, hyperhrenic, cataleptic and ecstatic states. During increasing hyper-arousal (characterized by EEG desynchronization): (1) the variability of the EEG amplitude decreases in introverts whereas in extroverts, it increases; (2) exteroception is transformed into an experience of interoception, while willed motor activity becomes increasingly impaired and ultimately inhibited, and (3) information processing during these hallucinatory states is preferentially shifted from the speech dominant and motor-coordinating or "major" toward the nonverbal, gestalt-perceiving, the non-dominant or "minor" cortical hemisphere.     

Ontogenetic development of somatosensory thalamus. I. Morphogenesis.

Structural maturation of the somatosensory thalamus in several laboratory mammals has been studied with the use of the Golgi methods. The period covered extends from approximately 1 week before term to 90 days after birth with emphasis on the immediate postnatal period. Although all systems appear immature at birth, the data indicate that those ascending and descending axon systems playing upon the ventrobasal complex tend to mature more quickly than certain significant elements in the neuropil of the receptive field. Those elements are particularly the small dendritic structures (for example, excrescences, tufts, etc.) which enter into the formation of synaptic glomeruli and are probably involved in the dendrodendritic linkages which abound in this part of the thalamus. The possible significance of the earlier maturation of thalamopetal afferents compared to the intrinsic thalamic neuropil whose processing operations they modulate, is discussed.     

Animal model of depression. III. Mechanism of action of tetrabenazine.

A study was undertaken to gain an understanding of the biochemical mechanism whereby tetrabenazine (TBZ) produces a sedative effect on the locomotor activity of rats. Rats injected with L-5-hydroxytryptophan (L-5-HTP, 30 mg/kg), the immediate precursor of 5-hydroxytryptamine (5-HT), showed the characteristic bison appearance, pitosis, and catalepsy normally observed after injecting TBZ (30 mg/kg). The treatment of rats with low doses of L-5-HTP (9 mg/kg) plus TBZ (2 mg/kg) significantly decreased locomotor activity, whereas low doses of either one of these drugs given alone had no significant effect on locomotor activity. The level of 5-hydroxyindoleacetic acid (5-HIAA) was elevated in the brain of rats sacrificed 3 hr after treatment with low doses of either L-5-HTP or TBZ alone. Treatment of rats with p-chlorophenylalanine to inhibit the synthesis of 5-HT had an inhibitory effect on the duration of sedation following an injection of TBZ (30 mg/kg). The results of the biochemical and pharmacological studies as reflected by changes in locomotor activity were interpreted to indicate that the sedative action of TBZ was due to an excess of functional 5-HT.     

P.O.E.M.S. syndrome with complete recovery after treatment of a solitary plasmocytoma.

The P.O.E.M.S. syndrome is a rare clinical entity that has been described mainly in Japan. It is characterized by a progressive polyneuropathy with raised CSF protein content, organomegaly, endocrinopathy, skin changes and plasma cell dyscrasia. We report a new documented case associated with a solitary plasmocytoma of the 12th thoracic vertebra. Immunopathological and ultrastructural studies of the peripheral nerve did not disclose any immune-specific changes. Surgery and radiation therapy of the plasmocytoma allowed a complete recovery, with a 5-year follow-up. This case report illustrates the need for serial full skeletal survey, including scintigraphy, in middle-aged patients with progressive polyneuropathy of obscure origin.     

Survey of cases of familial mental illness. L. S. Penrose, July 1945.

An investigation was made of all known cases of mental illness where more than one member of the family entered one of the Ontario Mental Hospitals. The materials is fairly complete for a period of 18 years. Analysis of the resulting data, on pairs of relatives, gave rise to the following conclusions of particular interest. (i) Schizophrenia, affective psychosis, senile psychosis, Huntington's chorea and mental defect are shown to be conditions which remain significantly true to type when mental disease occurs in different members of a family. As a rider to this, however, it is found that schizophrenia and affective psychosis are not very distinct entities and groups of closely related familial cases frequently include both diagnoses. (ii) Schizophrenia is a rare diagnosis in the fathers of patients and occurs in only 8.7% of fathers, as opposed to the 30.7% in the whole sample of relatives: it is not so rare in mothers (24.5%). (iii) The most frequent type of relationship in pairs of patients is sister and sister: next in frequency is the type brother and brother, then brother and sister. Mother and son, mother and daughter, father and daughter and then father and sone come next in order. Less frequent are uncle and nephew or uncle and niece and, again less frequent, aunt and nephew or niece; grandparents and grandchildren were rarely found. (iv) Fathers, diagnosed schizophrenic or first admitted below the age of 35, have more psychotic sons than psychotic daughters, but the reverse is true for mothers in the same categories. (v) Fathers diagnosed as having affective illness or first admitted at the age of 35 or over have more psychotic daughters than psychotic sons, but the reverse is true for mothers in the same categories. (vi) Male subjects with either schizophrenic or affective diagnosis and in early- or late-onset age groups, have more psychotic brothers than psychotic sisters. Similarly, female subjects have more psychotic sisters than psychotic brothers. (vii) Each main diagnosis group has its characteristic first admission age. (viii) The first admission age is earlier in males than in females for schizophrenics, and later in males than in females for affective disorders. (ix) Study of first admission ages in families indicates that parents and, particularly, grandparents are much older than children and, particularly, grandchildren at first admission. This effect is not attributed to progressive degeneration. (x) Male subjects show a significantly wider scatter of first admission ages than do female subjects.(ABSTRACT TRUNCATED AT 400 WORDS)