16,106 research outputs found
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Problematic technology use during adolescence: why don’t teenagers seek treatment?
No full textIn recent issues of Education and Health, I have briefly reviewed the empirical evidence relating to problematic use of technology by adolescents including online video gaming (Griffiths, 2014), social networking (Griffiths, 2013a; Kuss & Griffiths, 2011), and mobile phone use (Griffiths, 2013b). Most of the research studies that have examined ‘technological addictions’ during adolescence have indicated that a small but significant minority experience severe problems resulting in detriments to education, physical fitness, psychological wellbeing, and family and personal relationships (Griffiths, 2010; Kuss, Griffiths, Karila & Billieux, 2014). Given these findings, why is it that so few teenagers seek treatment? This article briefly outlines a number of reasons why this might be the case by examining other literature on adolescent drug use and adolescent gambling (e.g., Chevalier & Griffiths, 2005; 2005; Griffiths, 2001). Three different types of explanation are discussed: (i) treatment-specific explanations, (ii) research-related explanations, and (iii) developmental and peer group explanations
Griffiths, N, B2912
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/389171Surname: GRIFFITHS. Given Name(s) or Initials: N. Military Service Number or Last Known Location: B2912. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 44136.212892
Item: [2016.0049.21464] "Griffiths, N, B2912
Predictive value of developmental testing in the second year for cognitive development at five years of age
No full textThere is mixed evidence about the predictive validity of the Griffiths mental developmental scales. This study aimed to assess the predictive value of developmental assessments of children in their second year using the Griffiths mental development scales for neuro-developmental status at five years using the Wechsler preschool and primary scale of intelligence, revised (WPPSI-R). In a longitudinal study 253 children were assessed in their second year of life using the Griffiths scales and again at five years using the WPPSI-R. The scores were compared and the predictability of the WPPSI-R outcome on the basis of Griffiths scores was assessed. The WPPSI-R full scale IQ and the performance IQ at age five could be predicted moderately by the Griffiths general quotient (GQ) and by the personal/social scale. The Griffiths GQ was not a significant predictor of verbal IQ at age 5. The Griffiths performance scale predicted subsequent WPPSI-R performance IQ, and marginally the Full Scale IQ. For the early identification of children at risk for language delay, the Griffiths scales may not be suitable. However, a shortened form would be useful to predict overall cognitive development from the second year to school entry, focussing on the personal-social and performance scales
Quantum Griffiths Inequalities
No full textWe present a general framework of Griffiths inequalities for quantum systems. Our approach is based on operator inequalities associated with self-dual cones and provides a consistent viewpoint of the Griffiths inequality. As examples, we discuss the quantum Ising model, quantum rotor model, Bose-Hubbard model, and Hubbard model. We present a model-independent structure that governs the correlation inequalities
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Gaming addiction in adolescence (revisited)
No full textGaming addiction has become a topic of increasing research interest. Over the last 25 years, I have written many articles on adolescent video gaming for Education and Health as it is one of the research fields that is constantly evolving. In fact, over the last decade, there has been a significant increase in the number of scientific studies examining various aspects of online addiction particularly among adolescents and young adults (Kuss & Griffiths, 2012; Kuss, Griffiths, Karila & Billieux, 2014). Although the amount and the quality of research in the field has progressed much over this period, it is still in its infancy compared to other more established behavioural addictions (such as pathological gambling). This article briefly examines (i) how adolescent gaming addiction research has changed over the last three decades, (ii) how online gaming addiction has gained genuine psychiatric status, (iii) excessive gaming as an addiction, and (iv) where the gaming addiction field is going
The Alysiinae (Hym. Braconidae) parasites of the Agromyzidae (Diptera). VII Supplement.
No full textZusätzliche Informationen aus der Sammlung europäischer Alysiinae (haupsächlich Dacnusini) des Autors werden veröffentlicht aus Anlaß der Übergabe dieser Sammlung an das British Museum (Natural History). Zehn neue Arten werden beschrieben, zwei in Dacnusa Haliday (D. arctica spec. nov. und D. euphrasiella spec. nov.), drei in Exotela Förster (E. viciae spec. nov., E. lathyri spec. nov. und E. chromatomyia spec. nov.) und fünf in Chorebus Haliday (C. galii spec. nov., C. rostratae spec. nov., C. chenopodii spec. nov., C. claripennis spec. nov. und C. eucodonis spec. nov.). Chorebus stenocentrus (Thomson) wird neu beschrieben.Nomenklatorische Handlungenchenopodii Griffiths, 1984 (Chorebus), spec. n.claripennis Griffiths, 1984 (Chorebus), spec. n.eucodonis Griffiths, 1984 (Chorebus), spec. n.galii Griffiths, 1984 (Chorebus), spec. n.rostratae Griffiths, 1984 (Chorebus), spec. n.stenocentrus (Thomson, 1895) (Chorebus), comb. n. hitherto Dacnusa (Dacnusa) stenocentraarctica Griffiths, 1984 (Dacnusa), spec. n.cerpheres (Nixon, 1948) (Dacnusa), comb. n. hitherto Rhizarcha cerphereseuphrasiella Griffiths, 1984 (Dacnusa), spec. n.chromatomyiae Griffiths, 1984 (Exotela), spec. n.lathyri Griffiths, 1984 (Exotela), spec. n.viciae Griffiths, 1984 (Exotela), spec. n.Supplementary information from the author´s collection of European Alysiinae (mainly Dacnusini) is here published on the occasion of the deposition of that collection in the British Museum (Natural History). Ten new species are described, two in Dacnusa Haliday (D. arctica spec. nov. and D. euphrasiella spec. nov.), three in Exotela Förster (E. viciae spec. nov., E. lathyri spec. nov. and E. chromatomyia spec. nov.), and five in Chorebus Haliday (C. galii spec. nov., C. rostratae spec. nov., C. chenopodii spec. nov., C. claripennis spec. nov. and C. eucodonis spec. nov.). Chorebus stenocentrus (Thomson) is redescribed.Nomenclatural Actschenopodii Griffiths, 1984 (Chorebus), spec. n.claripennis Griffiths, 1984 (Chorebus), spec. n.eucodonis Griffiths, 1984 (Chorebus), spec. n.galii Griffiths, 1984 (Chorebus), spec. n.rostratae Griffiths, 1984 (Chorebus), spec. n.stenocentrus (Thomson, 1895) (Chorebus), comb. n. hitherto Dacnusa (Dacnusa) stenocentraarctica Griffiths, 1984 (Dacnusa), spec. n.cerpheres (Nixon, 1948) (Dacnusa), comb. n. hitherto Rhizarcha cerphereseuphrasiella Griffiths, 1984 (Dacnusa), spec. n.chromatomyiae Griffiths, 1984 (Exotela), spec. n.lathyri Griffiths, 1984 (Exotela), spec. n.viciae Griffiths, 1984 (Exotela), spec. n
Griffiths House
No full textStaff at Griffiths House. Doris Oliver, Betty Stoneman, H. Gledhall, Rev. A.W. Pederick (director, Methodist Inland Mission), Rev. N. Pearce, Carol Marker, P. Bonyton. Griffiths House opened in 1941 as Service club.Pearce, Norman C.Date:195
Conulinus randalanai Griffiths & Herbert 2013, sp. n.
No full textConulinus randalanai sp. n. Fig. 10 Etymology: Named for Roger Randalana, on-site manager of the Tsingy Beanka reserve and participant in many malacological expeditions throughout Madagascar. Diagnosis: Shell bulimiform, whorls relatively elongate, body whorl comprising approx. 66% of total shell height; spire profile cyrtoconoid; columella reflected, umbilicus narrow; sculptured by microscopic axial riblets and even finer spiral threads; lustreless, mauve-brown, paler apically. Description: Shell: Elongate-bulimiform, thin; body whorl comprising approx. 66 % of total shell height; spire profile cyrtoconoid, suture not strongly indented; whorls weakly convex, base a little more strongly so, periphery rounded; umbilicus reduced to a narrow tube-like channel by reflected upper portion of columella lip. Protoconch of approx. 1¼ whorls, smooth. Teleoconch of a further 4¾–5 whorls; appearing smooth, but microsculptured by numerous, very fine, close-set axial riblets, and even finer microscopic spiral threads; axial riblets becoming less regular with growth and resembling fine, uneven growthlines on last adult whorl, spiral sculpture persisting throughout and extending on to base. Aperture elongate-ovate; somewhat oblique to vertical axis of shell; peristome incomplete, simple and thin; no subterminal thickening evident inside outer lip; upper part of columella reflected and compressed against preceding whorl such that its edge is narrow (pleat-like in some specimens) and the umbilicus restricted to a very narrow, tube-like channel. Shell somewhat lustreless rather than glossy; predominantly mauve-brown in the freshest specimens, with some axial variations in intensity particularly on middle spire whorls; paler pinkish brown to fawn apically. Dimensions: Holotype, height 16.9 mm, max. diameter 8.5 mm; largest specimen, height 17.5 mm. Holotype: MADAGASCAR: Central W Madagascar, ca 60 km E of Maintirano, E of Belitsaka, E part of Tsingy Beanka, 18.06145°S 44.52595°E, ca 450 m, in leaf-litter and tsingy slots in comparatively lush tall dry deciduous/evergreen forest on south-facing hill, 2.x.2006, O. Griffiths, R. Randalana, D. Herbert & L. Davis, st’n 12/06 (AMS C.469591). Paratypes: St’n R 02/10 (NMSA L8469 /T2897, 1 specimen; AMS C.469584, 4 specimens; MNHN IM-2010-20069, 1 specimen). Additional locality data: Tsingy Beanka: st’ns 03/10, 11/10. Distribution: Evidently a narrow-range endemic; known only from the Tsingy Beanka. Habitat: Fresh dead shells have been found in tall, relatively lush dry deciduous and evergreen forest. No living specimens known. Remarks:The only comparable species known from Madagascar is C. rufoniger (Reeve, 1849), but that species differs in having more rounded whorls, a less elongate shape and a darker, chestnut brown colour (Fig. 7D, E). It also lacks spiral sculpture, and has a wider umbilicus and a thickened white varix inside the outer lip at maturity. C. rufoniger has been mostly recorded from north-eastern Madagascar (Fischer-Piette et al. 1994), but we can also confirm its presence at Antsingimavo (st’ns 04/06, 06/06), Tsingy Beanka (st’ns 01/09, 02/09, 09/09) and in the Tsingy de Bemaraha (Manombolo River). In the absence of anatomical data, our referral of this species to Conulinus is tentative. In its shape and spiral microsculpture, C. randalanai also resembles some species of Rachis Albers, 1850, but it lacks the colour pattern of dark spots and/or spiral bands commonly seen in species of that genus. Indeed, the referral of C. rufoniger to Conulinus also requires confirmation.Published as part of Griffiths, O. L. & Herbert, D. G., 2013, New species of land snails (Mollusca: Gastropoda) from two isolated karst formations in central western Madagascar: Tsingy Beanka and Antsingimavo, with additional notes on other regional endemics, pp. 1-48 in African Invertebrates 54 (1) on pages 15-16, DOI: 10.5733/afin.054.0101, http://zenodo.org/record/767010
Ampelita lindae Griffiths & Herbert 2013, sp. n.
No full textAmpelita lindae sp. n. Fig. 14 Etymology: Named for Linda Davis, manager of the Mollusca collection at the KwaZuluNatal Museum and one of the members of the team that discovered this species. Diagnosis: Shell discoidal, spire flat or nearly so, periphery rounded; aperture strongly descendant with reflected rim; umbilicus wide; surface rough, sculptured by raised collabral vermiform granules; lustreless, mid-brown with whitish, flake-like markings and a pale peri-umbilical band. Description: Shell: Medium sized, relatively thin, discoidal with very low spire (H:D= 0.357 –0.485); periphery at or just above mid-whorl, rounded or weakly angled; a very weak supraperipheral gutter evident in occasional individuals, particularly near start of last whorl; suture indented, final part of last adult whorl descending steeply prior to aperture; umbilicus wide, funnel-shaped. Protoconch of ca 1¼–1½ whorls, the first smooth, thereafter with numerous, irregular, axially elongate granules; junction with teleoconch ill-defined. Teleoconch of a further 2½ whorls; with irregular growth-lines and an uneven sculpture of raised vermiform granules, in a primarily collabral alignment (Fig. 14D); surface thus rendered rough to the touch; granules not simply periostracal, but present on underlying shell; this sculpture continues onto base and into umbilicus. Aperture elongate-ovate, strongly oblique to vertical axis of shell; peristome incomplete, interrupted in parietal region; rim of peristome reflected forming a flaring lip. Shell lustreless, covered with a predominantly mid-brown periostracum when fresh, with irregular, pale, flake-like markings; underlying shell mostly pale with darker brownish spiral bands either side of a pale, peri-umbilical band; sometimes also darker behind flared aperture lip. Aperture lip white, interior greyish brown in fresh material. Dimensions: Holotype, max. diameter 30.5 mm, height 12.6 mm; largest specimen, max. diameter 31.4 mm, height 12.7 mm. Holotype: MADAGASCAR: Central W Madagascar, ca 10 km NE of Belitsaka and ca 60 km E of Maintirano, E side of Tsingy Beanka, in leaf-litter and amongst limestone boulders in tall moist east-facing forest growing on limestone, above Bokarano River Cave, 17.90568°S 44.48822°E, ca 230 m, 29.x.2009, O. Griffiths, D. Herbert, L. Davis & R. Randalana, st’n 07/09 (AMS C.474167). Paratypes: Same data as holotype (NMSA L8468 /T2903, 1 adult specimen); st’n 07/10 (AMS C.469580, 3 adult specimens); st’n 09/10 (AMS C.469579, 1 adult specimen); st’n 07/10 (TMAM T163, 1 adult specimen). Distribution: Evidently a narrow-range endemic, currently known only from Tsingy Beanka; not yet known from either Tsingy de Bemaraha or Antsingimavo. Habitat: Known only from fresh dead shells collected in leaf-litter in tall, east-facing, evergreen forest in the central part of Tsingy Beanka. Remarks: With its relatively small, very depressed shell and rough, vermiform microsculpture, A. lindae is a distinctive species. A. granulosa (Deshayes, 1840) (from the north-eastern tip of Madagascar), another species with coarse microsculpture, is much larger and has distinct periostracal bristles arising from the granules, a feature not evident in the present species. Additional material resembling A. lindae has been found as subfossils in the Kasijy Forest (Kelifely Plateau). These are larger (max. diameter 32.9–35.0 mm, height 15.3– 17.9 mm) than the present material but are clearly morphologically close to it. The material available, however, is inadequate to permit thorough study and meaningful comparison.Published as part of Griffiths, O. L. & Herbert, D. G., 2013, New species of land snails (Mollusca: Gastropoda) from two isolated karst formations in central western Madagascar: Tsingy Beanka and Antsingimavo, with additional notes on other regional endemics, pp. 1-48 in African Invertebrates 54 (1) on pages 21-22, DOI: 10.5733/afin.054.0101, http://zenodo.org/record/767010
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