Social Categories and Student Perceptions in High School Mathematics

The plans that adolescent boys and girls make about participating in senior mathematics courses and mathematics-related careers are often at odds with their actual mathematics achievements. In contrast to explanations relating plans to gender differences in mathematics performance, mathematics participation can be explained by expectancy-value models of academic choice, based on gendered self-perceptions, task perceptions, and value judgments. This study with Year 10 Australian students ( N = 199) added to an expectancy-value model the students' current course levels that act as salient social categories. The results suggest that intervention programs need to target perceptions by girls and boys about mathematical talent, as well as making mathematics more useful and interesting to young adults. The findings raise further questions about the stratification of students into separate mathematics courses during the early years of high school.     

Loss, Healing, and the Power of Place

Human beings have a tendency to transform geographical spaces into dwelling places which assume significance in terms of their social, cultural and personal identities. The authors describe the ways in which this occurs, how it is disrupted by a natural disaster - an Australian bushfire - and how the reciprocal relationship between place and person can contribute to personal and communal healing. The discussion draws on a doctoral thesis conducted by the principal author, and is illuminated by excerpts from narratives provided by those who experienced the bushfire. The discussion is informed by insights from phenomenological geography and ecological philosophy.     

A preliminary examination of the evocative effects of the establishing operation

We attempted to isolate the evocative effects of the establishing operation for positively reinforced problem behavior with 2 participants. The study consisted of three phases. First, a functional analysis identified tangible items (Participant 1) and attention (Participant 2) as maintaining problem behavior. Second, access to tangible items and attention was systematically controlled (continuous access vs. no access) immediately prior to functional analysis sessions in which these consequences were delivered contingent on problem behavior. Results of this phase indicated that problem behavior occurred at higher levels when access to tangible items and attention was restricted. In the third phase, prior access was again controlled, but problem behavior produced no consequences. Results of this final phase indicated that problem behavior occurred at higher levels during extinction sessions when participants did not have prior access to the reinforcers.     

Moving up from the segment: a comment on Aichert and Ziegler's syllable frequency and syllable structure in apraxia of speech, Brain and Language, 88, 148-159, 2004

In a recent article, explore whether apraxia of speech (AOS) can be explained by disruption of the phonetic plans for high frequency syllables. This approach is a hybrid one, combining the notion of a mental syllabary with an explanation that the impairment in AOS results from reduced access to supra-segmental phonetic plans. In this commentary, we explore Aichert and Ziegler's approach and suggest that in testing a hybrid model it is important to be cautious in identifying implications for the two source models.     

Hemispheric contributions to lexical ambiguity resolution: evidence from individuals with complex language impairment following left-hemisphere lesions

Nine individuals with complex language deficits following left-hemisphere cortical lesions and a matched control group (n = 9) performed speeded lexical decisions on the third word of auditory word triplets containing a lexical ambiguity. The critical conditions were concordant (e.g., coin-bank-money), discordant (e.g., river-bank-money), neutral (e.g., day-bank-money), and unrelated (e.g., river-day-money). Triplets were presented with an interstimulus interval (ISI) of 100 and 1250 ms. Overall, the left-hemisphere-damaged subjects appeared able to exhaustively access meanings for lexical ambiguities rapidly, but were unable to reduce the level of activation for contextually inappropriate meanings at both short and long ISIs, unlike control subjects. These findings are consistent with a disruption of the proposed role of the left hemisphere in selecting and suppressing meanings via contextual integration and a sparing of the right-hemisphere mechanisms responsible for maintaining alternative meanings.     

An on-line investigation of lexical ambiguity processing in schizophrenia

The processing of lexical ambiguity in context was investigated in eight individuals with schizophrenia and a matched control group. Participants made speeded lexical decisions on the third word in auditory word triplets representing concordant (coin-bank-money), discordant (river-bank-money), neutral (day-bank-money), and unrelated (river-day-money) conditions. When the interstimulus interval (ISI) between the words was 100 ms, individuals with schizophrenia demonstrated priming consistent with selective, context-based lexical activation. At 1250 ms ISI, a pattern of nonselective meaning facilitation was obtained. These results suggest an attentional breakdown in the sustained inhibition of meanings on the basis of lexical context.