Time courses in visual-information processing: Some empirical evidence for inhibition

Summary In the literature two different views on the time course of activation of recognition units — hypothetical units that represent identity information — are proposed. The first view assumes that the recognition units accumulate activation gradually over time. The second assumes that the activation levels increase fast initially and then start to decrease. Hagenzieker and Van der Heijden (1990) have proposed a more general information-processing model, which is compatible with both views. In this model a treshold determines what type of time course will be obtained. For below-threshold-activation values a gradual accumulation of activation will be found; for above-threshold values activation levels will first increase and then, because of inhibition, decrease. This model served as a starting-point for the present paper. Elaboration of this model led to two testable hypotheses with regard to identification performance. The first prediction is that evidence for inhibition should be observed only under relatively bright luminance conditions. The second is that, given inhibition, the amount of the effect of this inhibition should increase over time. A partial-report bar-probe task was used to test the predictions. The experiment involved two luminance conditions and the information was sampled at two different moments in time. To control for possible localization artefacts a digit-naming task was also used. Evidence for inhibition was found in both luminance conditions. In accordance with the model the amount of the effect of inhibition increased over time.     

The internal clock: evidence for a temporal oscillator underlying time perception with some estimates of its characteristic frequency

Evidence for the proposition that human time perception is determined by an internal clock is largely indirect. It would strengthen the case for this hypothesis if a model for the internal clock were available from which predictions could be derived and tested, and if the basic parameter of such a model, the frequency at which the clock runs, could be estimated. A model for an internal temporal pacemaker is briefly described and its properties are explored by computer simulation. Results are obtained that provide a basis for predicting that, under appropriate conditions, interference between an imposed rhythm and the frequency of a temporal oscillator may cause perturbations in temporal judgment which are related to the characteristic frequency of that oscillator. Experimental data are reported which appear to demonstrate such an interference pattern. These results allow some estimates of the characteristic frequency of the temporal oscillator to be obtained.     

Interpersonal loss and self-mutilation

Self-mutilation was hypothesized to increase in frequency during periods of interpersonal loss in a treatment program for seriously disturbed adolescents. The study examined changes in the frequency of acts of self-mutilation, aggression, and running away for 32 teenagers who experienced interpersonal loss when staff members left employment. Data were collected for a 4-year period. Statistical findings indicated that the frequency of self-mutilation increased significantly during the time period of anticipated loss, 2 weeks prior to staff terminations. There was no significant increase in the frequency of self-mutilation immediately following the staff terminations. Also, there was no significant change in the rates of aggression or running away either before or after the loss events. It was concluded that the time of anticipated loss was the period of highest risk for these adolescents in terms of self-mutilative behavior.     

Disordered eating in women of color

It has been assumed that the occurrence of eating disorders in American racial minority groups are rare. Indeed, whereas the cultural context may afford “protection” to the group, it does not necessarily protect specific individuals. Individuals within each racial/ethnic group are subject to the standards of the dominant culture, particularly when the culture-of-origin is devalued by the dominant culture. Social, familial, and individual factors which contribute to disorders eating symptomatology are discussed. Discussions of obstacles to detecting eating disorders and guidelines for developing more inclusive theory of and treatment of persons with eating disorders is included.     

Light-dark variation and changes across the lactational period in the behaviors of undisturbed mother and infant guinea pigs (Cavia porcellus)

Lactating guinea pigs (Cavia porcellus) and their litters were observed by videophotography across the light/dark cycle at 1, 11, 21, and 31 days postpartum. The highest level of behavioral activity was seen in the dark, particularly in the hour after light offset. This circadian pattern was evident from Day 1 in mothers and from Day 11 in pups. Contact between mothers and pups was inversely related to activity, occurring more frequently during light. Maternal grooming of pups occurred on Day 1 and then declined: self-grooming by pups increased across days. Intake of solid food and water by pups occurred on Day 1 and increased thereafter. A nearly complete transition from nursing to independent ingestion was observed between 21-31 days of age. Overall, we document several ontogenetic changes in young guinea pigs and demonstrate that under laboratory conditions mother and infant guinea pigs exhibit a nocturnal activity pattern.     

Implicit learning: Indirect, not unconscious

Dienes and Berry (1997) argue that there really are two kinds of knowledge, implicit and explicit, that can be characterized through a subjective threshold. We argue that the subjective threshold does not separate two forms of knowledge, but instead two uses of knowledge, for two different purposes. With Neal and Hesketh (1997), we suggest that an understanding of learning will be better served by investigating the processing that occurs under various circumstances than by attempting to isolate learning that occurs with awareness from that which occurs without it.     

Book reviews

Modern American Religion, Vol. 3. Under God, Indivisible, 1941–1960 Martin E. Marty, 1996 Chicago: University of Chicago Press 548 pp. + xii. £27.96, US$34.95 ISBN 0–22–50898–6

Perspectives on New Religious Movements John A. Sauba, 1995 London: Geoffrey Chapman 240 pp., £12.99 (pb), £35.00 (hb) ISBN 0–225–66787–8 (pb),’ ISBN 0–225–66786‐X (hb)

New Religions and the New Europe Robert Towler, ed., 1995 Aarhus: Aarhus University Press 246 pp., £19.95 ISBN 87 7288 433 9

A New Dictionary of Religions John R. Hinnells, ed., 1995 Oxford: Blackwell 760 pp., US$74.95 (hb) ISBN 0–631–18139–3

Den Fremden verstehen: Eine Praktische Hermeneutik Theo Sundermeier, 1996 Göttingen: Vandenhoek & Ruprecht 260 pp. ISBN 3–525–01619–0

Religion and Mass Media: Audiences and Adaptations Daniel A. Stout & Judith M. Buddenbaum, eds, 1996 Thousand Oaks, California: Sage Publications 294 pp., £37.00 (hb), £18.50 (pb) ISBN 0–8039–7173–7 (hb), 0–8039–7174–5 (pb)

Contemporary Mainstream Religion: Studies from Humberside and Lincolnshire Peter G. Forster, ed., 1995 Aldershot: Avebury xxxvii +135 pp., £30.00 ISBN 1–8562–919–2

One Earth Many Religions: Multifaith Dialogue and Global Responsibility Paul F. Kntiter, 1995 Maryknoll, New York: Orbis xiv + 218 pp., US$17.00 ISBN 1–57075–037–8

A Wider Vision: A History of the World Congress of Faiths 1936–1996 Marcus Braybrooke, 1996 Oxford: Oneworld Publications 192 pp., £10.99, US$16.95 ISBN 1–85168–119–1

The Phenomenon of Teilhard: Prophet for a New Age David H. Lane, 1996 Macon, Georgia: Mercer University Press xvi +192 pp., US$21.95 ISBN 0–86554–498–0

The Wisdom of the Wyrd: Teachings for Today from our Ancient Past Brian Bates, 1996 London: Rider xiii +306 pp., £12.99 ISBN 0‐712E‐7277‐X

Desinformation als Methode. Die Bahā'ísmus‐Monographie des F. Ficicchia Udo Schaefer, Nicola Towfigh, Ulrich Gollmer, 1995 Hildesheim Georg Olms Verlag xiii + 685 pp., DM 65.00 (hb) ISBN 3–487–10041‐X

The New Latin American Mission History (Latin American Studies Series) Erick Langer & Robert H. Jackson, eds, 1995 Lincoln & London: University of Nebraska Press 212 pp., £15.95 (pb), £32.95 (hb) ISBN 0–8032–7953–1 (pb), ISBN 0–8032–2911–9 (hb)

Gender Rituals: Female Initiation in Melanesia Nancy C. Lutkehaus & Paul B. Roscoe, eds, 1995 New York Routledge 265 pp., £13.99 (pb), £37.50 (hb) ISBN 0–415–91107–9 (pb), ISBN 0–415–91106–0 (hb)

Daughters of Anowa: African Women and Patriarchy Mercy Amba Oduyoye, 1995 Maryknoll, New York: Orbis Books 229 pp., US$18.00 (pb) ISBN 0–88344–999–4

Christianity in Africa: The Renewal of a Non‐Western Religion Kwame Bediako, 1995 Edinburgh: Edinburgh University Press; Maryknoll: Orbis Books 276 pp., £16.95 ISBN 0–7486–0625–4

The Christian Heritage in the Holy Land Anthony O'Mahony with Goran Gunner & Kevork Hintuan, eds, 1995 Epping, Essex: Scorpion Cavendish xi + 320 pp., £15.95 ISBN 1–900269–06–6 (pb)

Patterns of the Sacred: English Protestant and Russian Orthodox Pilgrims of the Nineteenth Century Ruth & Thomas Hummel, 1995 Epping, Essex: Scorpion Cavendish ix + 76 pp., £10.00 ISBN 1–900269–08–2 (pb)

Pilgrimage Past and Present: Sacred Travel and Sacred Space in the World Religions Simon Coleman & John Elsner, 1995 London: British Museum Press 240 pp., Illus., £20.00 ISBN 0–7141–1738–2