Depression and its relation to light deprivation

The absence or diminution of light is potentially an anxiety-arousing situation for, perhaps, all of us. Even a cursory look at the origin myths of many cultures reveals the chaotic, destructive, and dangerous aspects of darkness. Additionally, language reflects the same qualities metaphorically and symbolically. Developmentally, the arrival of the darkness of evening potentially signals object loss and ego regression. But factors other than ubiquitous references to a consideration of light and darkness are relevant. Can it be that we are all at least prone to depression due in part to this factor? Questions regarding possible biological causes of depression are perhaps unanswerable at this time. Is the seratonin level really associated with depression and light deprivation? Research is as yet inconclusive. If a relationship exists, another question must be asked: Will certain psychological situations affect a person's seratonin production? The answer to this question of how depression is associated with biological causes is certainly beyond the scope of this paper. Yet the preceding case history reveals at least some psychological causes of depression that were initially seen as biologically based. The SAD proponents would have treated Mr. B with light therapy. The quick solution of light therapy, based on a shaky theoretical base and lacking sturdy research, has too often replaced the psychoanalytic approach. In all too many situations psychoanalysts are being replaced by lightbulbs.     

The effect of light intensity when onset or termination of illumination is used as reinforcing stimulus

The Psychological Record - Two experiments were performed to examine the reinforcing effects of onset and termination of non-aversive illumination, made conterminous with lever contacting, as a...     

The dissociation of discriminative and conditioned reinforcing functions of stimuli with changes in deprivation

Pigeons were studied in two experiments designed to explore the effects of deprivation level upon responding in each link of a two-link chained schedule. The stimulus associated with the terminal link of the chain can be both a discriminative stimulus (S^D) for responding in the presence of the stimulus and a conditioned reinforcer (S^r) for responding in the preceding link. Previous findings have indicated that the S^r function was more readily weakened by satiation than was the S^D function, i.e., the rate of responding decreased more rapidly in the initial link of the chain than in the terminal link. The first of the present experiments, in which tests were conducted after a series of sessions, produced different results: rates of responding in the two links declined simultaneously. The second experiment supported the hypothesis that the effects of satiation interact with the duration of maintenance on the satiation procedure: in early sessions the S^r function was more readily disrupted, but in later sessions the rates of responding in the two links declined simultaneously. Subsequent to this extensive series of identical sessions, the pigeons' deprivation level was altered before a session by pre-feeding the pigeons up to their normal post-session weights. The rates of responding failed to reflect fully this change in deprivation in the first such session, suggesting that the pigeons' behavior had become partially independent of deprivation level.     

Self-reported arousal during sleep deprivation and its relation to performance and physiological variables

Bohlin, G. & Kjellberg, A. Self-reported arousal during sleep deprivation and its relation to performance and physiological variables. Scand. J. Psychol., 1973, 14, 78–86.-Thayer's (1967) self-report inventory was translated and subjected to factor analysis. A four factor solution, slightly deviant from Thayer's, was adopted. The factors were labelled Sleep-Wakefulness, Stress, Euphoria, and Energy. Twenty Ss took part in a sleep deprivation (SD) experiment, which included physiological (EEG, skin conductance, body temperature), and reaction time (RT) recordings. All four factors showed decreasing trends over the night of SD, and with the exception of the Stres Factor, they were correlated with body temperature variations. The ratings in Sleep-Wakefulness and Energy were significantly lowered as a result of SD. The effect of SD upon these factors was also correlated with the effect upon the RT task and the physiological variables. From these results a model for phenomenological arousal was proposed and discussed.     

Age of onset of marijuana use and executive function

[Correction Notice: An Erratum for this article was reported in Vol 26(3) of Psychology of Addictive Behaviors (see record 2011-29227-001). Figure 1 should have been presented in color. All versions of this article have been corrected.] Marijuana (MJ) remains the most widely abused illicit substance in the United States, and in recent years, a decline in perceived risk of MJ use has been accompanied by a simultaneous increase in rates of use among adolescents. In this study, the authors hypothesized that chronic MJ smokers would perform cognitive tasks, specifically those that require executive function, more poorly than control subjects and that individuals who started smoking MJ regularly prior to age 16 (early onset) would have more difficulty than those who started after age 16 (late onset). Thirty-four chronic, heavy MJ smokers separated into early and late onset groups, and 28 non-MJ smoking controls completed a battery of neurocognitive measures. As hypothesized, MJ smokers performed more poorly than controls on several measures of executive function. Age of onset analyses revealed that these between-group differences were largely attributed to the early onset group, who were also shown to smoke twice as often and nearly 3 times as much MJ per week relative to the late onset smokers. Age of onset, frequency, and magnitude of MJ use were all shown to impact cognitive performance. Findings suggest that earlier MJ onset is related to poorer cognitive function and increased frequency and magnitude of MJ use relative to later MJ onset. Exposure to MJ during a period of neurodevelopmental vulnerability, such as adolescence, may result in altered brain development and enduring neuropsychological changes. (PsycINFO Database Record (c) 2012 APA, all rights reserved).     

Age of first onset major depression in Chinese Americans

Using data from the Chinese American Epidemiological Study, risk for experiencing an initial episode of major depression across the life course was examined. Data were collected on 1,747 U.S.-born and foreign-born Chinese Americans (ages 18-65 years). Results suggest that Chinese American women did not evidence higher risk than Chinese American men for experiencing a 1st major depressive episode. Risk for experiencing a 1st depressive episode decreased as length of residence in the United States increased. Although those who immigrated at younger ages evidenced greater overall risk, those who came at later ages were more likely to become depressed at or soon after arrival. Competing theories of acculturation-related risk are discussed and directions for future research are proposed.     

Adolescent individuation in relation to parents and friends: Age and gender differences

The general aim of the study was to examine age and gender differences in various aspects of dependency needs and autonomy strivings of Slovene adolescents in relations to parents and friends. Another research question was whether the components of separation – individuation in relation to parents were related to four aspects of adolescent – friends relationships which resemble some aspects of separation – individuation (i.e., support seeking from friends, friends' idealization, successful separation, fear of losing friends' love). The questionnaires were given to 495 adolescents in Grades 7 to 12. Results showed that early adolescence is a period during which the most prominent changes occur in individuation process. In comparison with other groups, seventh graders showed the highest levels of dependency needs (i.e., high support seeking, high parental idealization). Another group of early adolescents (eighth graders) appeared to be the most ambivalent group as far as individuation towards parents is concerned. A pattern of successful individuation was most evident in the two late adolescent groups. Girls reported greater support seeking and more successful individuation from parents and friends than boys. On the other hand, boys showed more excessive autonomy strivings in their individuation, but they also reported more parental and friends' idealization than girls. We found a support for the thesis about positive associations between the aspects of separation – individuation that are reflected in adolescent – parents and adolescent – friends relations. However, the results also support the thesis that in the case of less satisfactory relations with parents adolescents can compensate for the deprivation of their dependency needs by an increased support seeking in their relations with friends.