Conceptions of first‐year university students of the constituents of matter and the notions of acids and bases

Preconceptions of first‐year university students of the constituents of matter and the notions of acids and bases were investigated on a total of 400 students. The procedure used consisted of free interviews, semi‐structured interviews and questionnaires.

It was found that the constituents of matter were well known to students, but that interactions between these constituents were either totally unknown or were the subject of severe misconceptions. The students’ knowledge tended to be qualitative and formal, with a worrying lack of connection with everyday life.     

Etude en temps réel de la production eEcrite chez des enfants de sept et huit ans

The aim of this research is to study on-line written production in children. Twelve seven year old children and twelve eight year old children were asked to compose two texts (a narrative and a report). They were filmed as they wrote in order to investigate the temporal caracteristics of their composition (pauses, rates…). The results show three main findings:

- the rates increases from seven to eight year old.

- pauses times varied according to the syntactic organisation of the next sentence.

- longer pause times are localized after punctuation marks and before connective.

     

Judgement and production of drawings by 3- to 10-year-olds: Comparison of declarative and procedural drawing knowledge

In this experiment, 80 children between the ages of three and ten produced and judged drawings of a person and a house. Two alternative hypotheses were tested. Under the first hypothesis, young children have internal models of persons and objects which are comparable to those of adults, but they have problems implementing their knowledge and planning and managing the graphic activity. If this hypothesis is true, we should obtain an interaction between age and type of task (production vs. judgement). Under the second hypothesis, children’s drawings are a direct reflection of their internal models of the items drawn. This hypothesis predicted a significant positive correlation between performance on production and judgement. In the judgement task, the subjects were presented with pairs of drawings and asked to indicate the more elaborate drawing. For the house and the man drawing, children by the age of three were able to correctly determine the most elaborated of the two presented drawings. A strong interaction was obtained between age and type of task (production or judgement), due to the fact that the difference between production performance and judgement performance decreases with age. The discussion suggests a limited cognitive capacity hypothesis to account for the results, and proposes some possibilities for future studies.     

Impact des formulations sur la résolution de problèmes additifs chez l’enfant de 6 a 10 ans

An experiment was carried out concerning arithmetical problem solving in children. Three between sujects variables were manipulated. All problems followed the same underlying pattern with an initial state (Ei), two additive transformations (T1 and T2), and a final state (Ef); yet the unknown state concerned either Ef (S1 problems) or Ei (S2 problems). The order of introducing the transformations was counterbalanced: either state first (O1 order) or transformations first (O2). Finally, the question was located either at the end of the problem (Q1) or at its beginning (Q2). One hundred and ninety two subjects (64 six, eight, and ten year-olds) were submitted to 8 different problems of the same type. The difficulties of the numerical series were tentatively controlled on an atempt to render the computations roughly «proportional» to ages. Quantitative and qualitative analysis were conducted. Results show that: a) Problems with final state unknown (S1) are solved more easily and early, whereas problems with initial state unknown (S2) are better solved as the children grow older. b) Introducing the transformations first (O2) and placing the question at the beginning of the problem-text (Q2) yields better performances c) The procedures used to solve the problems are clearly dependant on the wording of the problems. An interpretation is proposed which takes in account both the knowledge available in L.T.M. and the limitations of working memory.     

Tracking the mind during writing: immediacy, delayed, and anticipatory effects on pauses and writing rate

This study examines the dynamics of cognitive processes during writing. Participants were 5th, 7th and 9th graders ranging in age from 10 to 15?years. They were shown a short silent video composed of clips illustrating conflictual situations between people in school, and were invited to produce a narrative text. Three chronometric measures of word n were analyzed using a Linear Mixed-Effects Model regression procedure: pause duration before word n, pause duration within word n, and writing rate of word n. The predictors were sublexical and lexical properties of word n, i.e., immediacy effects, word n ? 1, i.e., delayed effects, and of word n?+?1, i.e., anticipatory effects. The writing-rate and the intra-word-pause measures show both immediacy and anticipatory effects. However, the between-word-pause durations show only delayed effects, which has not been reported in previous studies. As far as we know, our study is the first investigation which reveals the occurrence of parallel and serial effects in written text production: preprocessing of word n?+?1 occurs when word n is being written, and properties of word n ? 1 still exert their influences while the pen has already moved to the next word.     

Disentangling the impact of semantic and formal factors in the acquisition of number inflections: Noun, adjective and verb agreement in written French

In written French, the acquisition of the nominal plural (-s) occurs earlier and faster than the acquisition of the verbal plural (-nt) (Totereau, Thevenin & Fayol, 1997, Learning to Spell). The reasons for this difference are not well known. The objective of the present research is to test two alternative hypotheses, which may provide an account of this difference by exploiting a particularity of written French: The agreement of adjectives. According to the first hypothesis, the nominal plural is acquired before the verbal plural because it is semantically grounded, unlike the latter. According to the second, the early emergence of noun agreements is due to the fact that -s occurs more consistently than -nt. These two hypotheses lead to different predictions, that can be tested empirically, with regard to the agreement of adjectives. These predictions were studied in three experiments using sentences recall or completion tasks presented to children from 7 to 10 years old. The results confirm the semantic hypothesis but reveal an impact of consistency on performance.     

The acquisition of subject-verb agreement in written French: From novices to experts' errors

Recent studies have shown that many subject-verb agreement errors consist of making the verb agree with the immediately preceding noun, as in The smell of the rubbish-bins are foul. Assuming that it is the automaticity of the agreement operation which is responsible for these attraction errors in expert writers, the present studies aimed at demonstrating the gradual automatization of this operation in young writers by examining developmental changes in the occurrence of agreement errors. In three experiments we found that subjects' performance moves from systematic errors in number agreement in young children (e.g., no use of plural marks) to attraction errors in fifth graders and older adults through an intermediate phase characterized by an attention-demanding and easily disrupted computation of verb agreement displayed by some second graders. Attraction errors are a byproduct of the automatization of the implementation of the agreement process.     

Can an early mathematical intervention boost the progress of children in kindergarten? A field experiment

European Journal of Psychology of Education - Socioeconomic status (SES) has been shown to be associated with children’s arithmetic knowledge as early as kindergarten, which is an important...