Rapid volitional control of apparent motion during percept generation

How rapidly can one voluntarily influence percept generation? The time course of voluntary visual–spatial attention is well studied, but the time course of intentional control over percept generation is relatively unknown. We investigated the latter question using “one-shot” apparent motion. When a vertical or horizontal pair of squares is replaced by its 90º-rotated version, the bottom-up signal is ambiguous. From this ambiguous signal, it is known that people can intentionally generate a percept of rotation in a desired direction (clockwise or counterclockwise). To determine the time course of this intentional control, we instructed participants to voluntarily induce rotation in a precued direction (clockwise rotation when a high-pitched tone was heard, and counterclockwise rotation when a low-pitched tone was heard), and then to report the direction of rotation that was actually perceived. We varied the delay between the instructional cue and the rotated frame (cue-lead time) from 0 to 1,067 ms. Intentional control became more effective with longer cue-lead times (asymptotically effective at 533 ms). Notably, intentional control was reliable even with a zero cue-lead time; control experiments ruled out response bias and the development of an auditory–visual association as explanations. This demonstrates that people can interpret an auditory cue and intentionally generate a desired motion percept surprisingly rapidly, entirely within the subjectively instantaneous moment in which the visual system constructs a percept of apparent motion.     

La enseñanza práctica de la Psicología: una experiencia de condicionamiento instrumental

RESUMEN

n este informe se presenta una experiencia docente en la que un elevado número de estudiantes de primero de Psicología (140), trabajando en grupos de cinco personas y utilizando unos recursos limitados, consiguieron llevar a cabo un condicionamiento instrumental con ratas en la caja de Skinner, cumpliendo adecuadamente los objetivos metodológicos propuestos. Esta experiencia confirma la posibilidad de realizar prácticas en Psicología a pesar de los numerosos impedimentos que existen para ello, destacados por los autores.     

Defect analysis of Fe3(Al1– x Si x ) alloys by positron-lifetime spectroscopy

The recovery behaviour of vacancy-type defects created at 1000°C in Fe₃(Al_{1– x} Si _x ) alloys has been investigated by positron-lifetime measurements in samples cooled to room temperature by water quenching, air quenching and furnace cooling. In addition, a set of samples was aged for one week at 520°C. After water quenching, measurements reveal a high concentration of thermal vacancies, and from the decrease of the average positron lifetime it is inferred that vacancy recovery is strongly composition-dependent. Greater decreases of the positron lifetime were found for Si-rich samples, suggesting diffusion enhancement as the Si concentration increases. For the Fe₃Al alloy, the retained vacancy concentration depends strongly on the cooling rate. This is related to atomic ordering and a rebuilding of the D0₃ structure.     

El lenguaje de los antropoides

RESUMEN

José Eugenio Ortega presenta este dossier sobre el lenguaje de los antropoides repasando algunos intentos de enseñar lenguaje a chimpancés y recordando la gran influencia del “Proyecto Washoe” en investigaciones posteriores desde distintas perspectivas. A continuación explica la clasificación de orden de los primates y las características que hacen de los chimpancés los sujetos idóneos para este tipo de estudios y aborda la polémica entre los grupos que siguen distintos procedimientos respecto a cuál es la metodología correcta, afirmando que en todos los trabajos de lenguaje de antropoides ha habido fallos en el control de variables. En la última parte explica cuatro posturas de los investigadores a la hora de interpretar los resultados de sus estudios, finalizando con algunas reflexiones en torno a las implicaciones de estos trabajos con relación a los de Darwin y manifestando que el estudio de las capacidades de simbolización de los antropoides puede aportar bastantes datos al problema de la evolución humana.     

Narrative Skills in Written Texts by Deaf and Hearing Bilingual Adolescents

Most studies on narrative competence have focused on monolingual subjects, and there are very few studies which address this issue in bilingual subjects dealing with two language systems. In the present case study we analyzed and compared the textual and narrative written skills of three deaf and three hearing adolescents attending eighth grade at a bilingual school (Italian and Italian Sign Language), characterized by a pragmatic approach to writing (based on production and the interpretation of texts in genuine and meaningful situations).Their competences were assessed through a well-known narrative task, the Frog Story (Mayer, 1969), and the following parameters were examined: complex syntax, narrative structure and evaluation devices. Results show that there were not significant differences in the texts written by the deaf students compared to the hearing students and that being immersed in a bilingual context did not interfere with the development of textual and narrative competence in either hearing or deaf students.     

The (un)reasonableness of reporting: antecedents and consequences of reporting sexual harassment

This study places the reporting of sexual harassment within an integrated model of the sexual harassment process. Two structural models were developed and tested in a sample (N = 6,417) of male and female military personnel. The 1st model identifies determinants and effects of reporting; reporting did not improve--and at times worsened--job, psychological, and health outcomes. The authors argue that organizational responses to reports (i.e., organizational remedies, organizational minimization, and retaliation) as well as procedural satisfaction can account for these negative effects. The 2nd model examines these mediating mechanisms; results suggest that these mediators, and not reporting itself, are the source of the negative effects of reporting. Organizational and legal implications of these findings are discussed.     

Coping in context: sociocultural determinants of responses to sexual harassment

The authors investigated coping responses to sexual harassment across 4 samples of working women from 3 cultures and 2 occupational classes. Complete-link cluster analyses provide preliminary support for D. E. Knapp, R. H. Faley, S. E. Ekeberg, and C. L. Z. Dubois's (1997) coping framework, suggesting that avoidance, denial, negotiation, advocacy seeking, and social coping are universal responses to sexual harassment. Further, L. F. Fitzgerald's (1990) internal-external dichotomy appears to capture higher order relationships among coping responses. In addition, regression analyses suggest that Turkish and Hispanic American women engage in more avoidance than Anglo American women, and Hispanic women also use more denial but less advocacy seeking. No differences emerged in social coping. The authors discuss these results in the context of coping theory, individualism-collectivism, power distance, and patriarchal gender norms.