Coordination dynamics of rhythmical and discrete prehension movements: Implications of the scanning procedure and individual differences

The aim of this study was to compare the coordination dynamics of discrete and rhythmical reaching and grasping movements from a dynamical systems perspective. Previous research from this theoretical perspective had focused on rhythmical actions and it is unclear to what extent discrete movements are amenable to a similar dynamical systems analysis. Six adult subjects performed prehension in two conditions: a discrete, non-continuous mode and a rhythmical, continuous mode. A `scanning procedure' was implemented between pre- and post-tests in which the required time of final relative hand closure (T_rfc) was systematically varied. It was shown that the error in the reaching and grasping pattern was least at an attractor region and systematically increased with deviation from the attractor. Results also indicated that there were no differences between condition or trial block for the group. However, there were several within-subject effects of interest. The validity of the scanning procedure was found to be questionable in the discrete condition, where four subjects showed differences in T_rfc between pre- or post-test and the predicted T_rfc of the scanning procedure. Four out of six subjects also had different preferred T_rfc values for discrete and rhythmical movement, indicating that individual specific models might need to be constructed for future dynamical modelling of discrete movement.PsycINFO classification: 2330     

Inhibition of Intermediate-Term Memory Following Passive Avoidance Training in Neonate Chicks by a Presynaptic Cholinergic Blocker

The effects of a specific presynaptic cholinergic antagonist, toosendanin, on memory formation following a passive avoidance training experience in day-old chicks was investigated. Bilateral injection of toosendanin into the neostriatal/hyperstriatal region of the chick forebrain produced memory impairment in a dose-dependent manner. Retention deficits were apparent from 20 min following training in chicks treated with toosendanin, regardless of the injection time relative to training. Chicks that received injections of the drug at corresponding times prior to retention tests showed normal retention levels, suggesting that toosendanin has no effect on performance and memory retrieval. These results indicate an involvement of cholinergic transmission during an early stage of memory formation.     

Assessing the specific psychopathology of binge eating disorder patients: Interview or self-report?

Research addressing the assessment of binge eating and associated eating disorder psychopathology has steadily increased in recent years. Few studies have examined the relationship between the various assessment methods. This study compared an investigator-based interview, the Eating Disorder Examination (EDE), with a self-report version of that interview, the EDE-Q. Fifty-two individuals (six men and 46 women) with binge eating disorder (BED) completed both instruments. Modest-to-good agreement and significant correlations (P < 0.0001) were found between the two methods on all four subscales assessing specific eating disorder psychopathology (i.e., Restraint, Eating Concern, Weight Concern, and Shape Concern subscales). However, higher levels of disturbance were consistently reported on the EDE-Q than the EDE interview. The two methods were not significantly or reliably related to one another when assessing binge eating. This may be due in part to the difficulty inherent in identifying binges in subjects with BED. Examination of individual item scores suggest that it might be possible to improve the performance of the EDE-Q by clarifying the definitions of certain complex features, although this should not be at the expense of compromising the practical utility of its self-report format.     

Evidence of deontic reasoning in 3- and 4-year-old children

Deontic reasoning is reasoning about what one may, ought, or ought not do in a given set of circumstances. Virtually all of our social institutions and child-rearing practices presume the capacity to reason about deontic concepts, such as what is permitted, obligated, or prohibited. Despite this, very little is known about the development of deontic reasoning. Two experiments were conducted that contrasted children’s reasoning performance on deontic and indicative reasoning tasks (i.e., the reduced array selection version of the Wason card selection task). Like adults, children as young as 3 years of age were found to adopt a violation-detecting strategy more often when reasoning about the deontic case than when reasoning about the indicative case. These results indicate that violation detection emerges as an effective deontic reasoning very early in human development.     

Book reviews

The Oxford Encyclopedia of the Modern Islamic World. John L. Esposito (Ed.), 1995. New York, Oxford, Oxford University Press. 4 vols, £295.00, ISBN 0 19 506613 8.

Deciphering the Signs of God: a phenomenological approach to Islam. Annemarie Schimmel, 1994. Edinburgh, Edinburgh University Press. 302 pp., hb. £39.50, ISBN 0 7486 0460 X.

The Rainbow of Faiths. John Hick, 1995. London, SCM Press. 160 pp., pb. £9.95, ISBN 0 334 02608 3.

Scholarly Approaches to Religion, Interreligious Perceptions, and Islam. Jacques Waahdenburg, (Ed.), 1995. Bern, Berlin, Frankfurt a. M., New York, Paris, Vienna, Peter Lang. 464 pp., hb. Sf76. (= £38), ISBN 3 906752 93 3.

Tariqat al‐Tahin al‐Balaghi wa al‐Tafsir. Roland Meynet, Louis Pouzet, Naila Farouki & Ahyaf Sinno, 1993. Beirut, Lebanon, Dar al‐Mashriq. 306 pp., pb. n.p., ISBN 2 7214 5003 4.

Religious Polemic and the Intellectual History of the Mozarabs, c. 1050–1200. T. Burman, 1994. Leiden, E. J. Brill. 407 pp., hb. np., ISBN 90 04 09910 7.

Justice, Courtesy and Love: theologians and missionaries encountering world religions, 1846–1914. Kenneth Cracknell, 1995. London, Epworth Press. 459 pp, pb. £20, ISBN 0 7162 0501 7.

Mission and Dialogue. Michael Nazir‐Ali, 1995. London, SPCK Press. 152 pp, pb., £8.99, ISBN 0 281 04810 X.

Early Mamluk Diplomacy (1260–1290): treaties of Baybars and Qalawun with Christian rulers. P. M. Holt, 1995. Leiden, E. J. Brill. 161 pp., hb. NLG 100, ISBN 90 04 10246 9.

The Search for Fundamentals: the process of modernization and the quest for meaning. Lieteke Van Vucht Tljssen, Jan Berting & Frank Lechner (Eds), 1995. Dordrecht, The Netherlands, Kluwer Academic Publishers. 293 pp., £80.00, 0 7923 3542 2.

Religion und prosoziales Verhalten Ein Symposion. Walter Kerber, (Ed.), 1995. Munchen, Kindt Verlag. 224 pp., hb. DM.36.00, ISBN 3 925412 18 2.

Nationalism, Ethnicity and Cultural Identity in Europe. (Comparative Studies in Migration and Ethnic Relations 1). Keebat von Benda‐Beckman & Maykel Verkuyten (Eds), 1995. Utrecht, European Research Centre on Migration and Ethnic Relations (ERCOMER). 199 pp., £11.95, ISBN 90 75719 01 9.

‘Das Projekt Weltethos’ in der Erziehung: Referate und Ergebnisse des Nurnberger Forums 1994. Johannes Lahnemann (Ed.), 1995. Hamburg, E.B. Verlag. 410 pp., pb. n.p., ISBN 3 923002 86 6.

Fundamentalism and Intellectuals in Egypt, 1973–1993. David Sagiv, 1995. London, Frank Cass. 188 pp., hb. £35, ISBN 0 7146 4581 8.

Being Human in Africa: toward an African Christian anthropology. Augustine C. Musopole, 1994. New York, Peter Lang. 261 pp., pb. n.p., ISBN 0 8204 2304 1.

Russians in the Former Soviet Republics. Paul Kolstoe with a contribution by Andrei Edemsky, 1995. London, Hurst & Company. 340 pp., hb. £35.00, ISBN 1 8065 206     

Conditioning of a free operant in Octupus cyaneus Gray

Operant conditioning was studied in six specimens of Octopus cyaneus Gray. An “arm-out-of-water” operant, in which the octopus inserted an arm up a feeding-tube breaking the water surface, proved susceptible to reinforcement schedules. An apparatus was developed that provided automated reinforcement and recording. Performance was studied under continuous reinforcement, fixed-ratio and variable-ratio schedules, and extinction conditions.