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Biomedical subjects

A Moffitt

Publications and source records attributed to A Moffitt.

7 recordsLinked to original sources
PubMed1990

Dream recall: imagination, illusion and tough-mindedness.

The failure of dream psychology to delineate clear, consistent and interesting correlates of dream recall presents serious difficulties for the claim that dream recall is functionally significant. The present study examined the relation of six indices of boundary functioning and four measures of life affect to the consistency and frequency of dream recall in 373 young adults. Factor analysis indicated that consistency and frequency of dream recall were unrelated to global measures of boundary functioning, stress, depression, hassles and uplifts. On the assumption that the correlates of dream recall might be specific rather than global, 34 items from our expanded boundary questionnaire having significant zero order correlations with the frequency of dream recall were factor analyzed separately for consistent and inconsistent recallers. The two factors in each analysis were quite similar. Factor one was called the Imagination, factor two, Illusion. Among consistent recallers, dream recall and a group of items called "tough mindedness" loaded on the Imagination factor. For inconsistent recallers similar variables loaded on the Illusion factor. For all subjects, dream recall and tough mindedness were linked whether associated with Imagination or Illusion. The Imagination factor is creative and linked to dream recall for consistent recallers. Their illusion factor is frightening. For inconsistent recallers, the Illusion factor is linked to dreaming and is not frightening, and their Imagination factor is not creative. The stability-instability of dream generation and recall over time apparently results in the association of the dream recall tough-mindedness group of items with either the Imagination or Illusion factors.

Adaptation, Psychological↗
PubMed1989

Variations in period-analysed EEG asymmetry in REM and NREM sleep.

Monopolar EEG was recorded from lateral frontal and parietal sites with linked ear reference during sleep in 24 adults. Electrode placement followed the 10-20 International system. EEG was quantified using digital period analyses. The absolute difference in interhemispheric EEG parameters was compared for Stage 2, REM, and a slow wave sleep measure. The absolute difference measures reflect the degree of symmetry or asymmetry, regardless of the hemisphere of origin. Theta and delta activity in slow wave sleep was more asymmetrical than in either Stage 2 or REM. REM sleep was associated with the smallest asymmetries. These results do not support a right hemisphere REM, left hemisphere NREM relationship. Rather they suggest that REM sleep is associated with relative hemispheric symmetry whereas asymmetries are most prominent in slow wave sleep. Stage 2 sleep was significantly less asymmetrical than slow wave on a number of theta and delta measures. The significant differences between slow wave and Stage 2 sleep may denote functional differences within NREM sleep stages.

Adolescent↗
PubMed1986

Dream self-reflectiveness as a learned cognitive skill.

This research was directed toward the contradiction sustained by cognitive dream psychology, which on the one hand regards dreaming as higher symbolic activity and, on the other, sees its organizational and functional characteristics as derivative and/or inferior to those of waking consciousness. Study 1 evaluates the degree of self-reflective meta-cognition in dreams from different sleep stages. Subjects were 24 college students selected such that half were self-reported high-frequency dream recallers and half were low-frequency recallers. Both groups were composed equally of men and women. Greater self-reflectiveness (SR) was found in REM dreams as compared with those from stages 2 and 4, which did not differ. High-frequency recallers showed more dream SR than did low-frequency recallers. Study 2 assessed the extent to which self-reflective and lucid dreaming can be learned as a cognitive skill by varying levels of intention and attention paid to dreaming. After 3 weeks of home dream collection, results showed that four experimental groups had greater dream SR than did a baseline group. The most effective treatment was the mnemonic, wherein attention patterning schemas learned in waking resulted in more self-reflective and lucid dreaming than did either baseline or attention-control conditions. These results provide evidence that dreaming is not single-minded but variable along a self-reflective process continuum, and suggest functional and organizational levels that are consistent with the conception of dreaming as higher order cognitive activity.

Adult↗
PubMed1984

Quantitative description of sleep stage electrophysiology using digital period analytic techniques.

The purpose of the current study was to assess the overlap in variance of two procedures for the quantification of sleep electrophysiology: conventional stage scoring and computer quantification of tonic activity. Data were collected on 24 nights from eight subjects and were scored according to a modified set of Rechtschaffen and Kales criteria and submitted to a period-analytic computer analysis. Following this, discriminant function analyses were performed on the data for each night to predict the visual stage scores from the computer-generated data. The results indicate a very high degree of predictive accuracy (91.05%) supporting the contention that the computer-quantified data set includes the variance normally captured by stage scoring. The implications of computer quantification of sleep electrophysiology are discussed.

Adolescent↗
PubMed1979

The description of structural and temporal characteristics of tonic electrophysiological activity during sleep.

The structural and temporal characteristics of tonic variation among electrophysiological measures during sleep are examined from the point of view of sleep stage scoring procedures and the digital quantification and statistical analysis of these measures. Sleep stage scoring procedures are nominally scaled and therefore less able to index structural and temporal characteristics than are measures derived from digital methods of quantification having the properties of interval or ratio scales. These arguments are illustrated using principal components analysis to describe the structure of tonic covariation among 36 variables derived from the computer analysis of EEG, EMG, and EOG. Three components resulting from the analysis are tentatively named 'slow-fast', 'hemispheric-shift' and 'eyes-activation'. They appear across variations in experimental manipulations such as night time awakenings and also across differences in age and species. The periodic characteristics of the vectors associated with the three components are specified by means of the Fast Fourier transform in combination with digital low pass and band pass filtering. Cycles are found which are both slower and faster than the paradigmatic 90 min ultradian rhythm. These results indicate that currently available techniques of digital and statistical analysis provide new possibilities for research on the electrophysiology and psychophysiology of sleep.

Adolescent↗