A multistream model of visual word recognition

Four experiments are reported that test a multistream model of visual word recognition, which associates letter-level and word-level processing channels with three known visual processing streams isolated in macaque monkeys: the magno-dominated (MD) stream, the interblob-dominated (ID) stream, and the blob-dominated (BD) stream (Van Essen & Anderson, 1995). We show that mixing the color of adjacent letters of words does not result in facilitation of response times or error rates when the spatial-frequency pattern of a whole word is familiar. However, facilitation does occur when the spatial-frequency pattern of a whole word is not familiar. This pattern of results is not due to different luminance levels across the different-colored stimuli and the background because isoluminant displays were used. Also, the mixed-case, mixed-hue facilitation occurred when different display distances were used (Experiments 2 and 3), so this suggests that image normalization can adjust independently of object size differences. Finally, we show that this effect persists in both spaced and unspaced conditions (Experiment 4)—suggesting that inappropriate letter grouping by hue cannot account for these results. These data support a model of visual word recognition in which lower spatial frequencies are processed first in the more rapid MD stream. The slower ID and BD streams may process some lower spatial frequency information in addition to processing higher spatial frequency information, but these channels tend to lose the processing race to recognition unless the letter string is unfamiliar to the MD stream—as with mixed-case presentation.     

Hormonal response to competition in human males

Changes in testosterone (T) and cortisol (C) were evaluated in males competing in a non-athletic laboratory reaction time task. Subjects were randomly assigned to “win” or “lose” by adjusting feedback regarding their task performance. Further, subjects were randomly assigned to either a Close Contest condition (where one person barely “defeated” his opponent), or a Decisive condition (in which the victory was clear). Throughout competition, samples of saliva were taken and assayed later for T and C. Post-competition mood and attributions were also measured. Winners had higher overall T levels than losers, with no significant difference between Close Contest or Decisive Victory conditions. In contrast, C levels did not differ between winners and losers nor did Condition (Close or Decisive) have any effect. Mood was depressed in Decisive losers compared to all other groups. The results indicate that the perception of winning or losing, regardless of actual performance or merit on the task, differentially influenced T (but not C) levels, and that such hormonal changes are not simply general arousal effects but are related to mood and status change.     

The offensive nature of maternal aggression in mice: Effects of fluprazine hydrochloride

The phenylpiperazine fluprazine hydrochloride was used to test the hypothesis that maternal aggression in laboratory mice reflects offensive motivation. Lactating females (n = 8 per condition) tested for aggression following drug treatment (1.0 mg/kg and 5.0 mg/kg of fluprasine) were significantly less aggressive than saline controls according to all measures used. The findings support the hypothesis that maternal aggression is offensive in nature, and provide no evidence that maternal attack is a mixture of offensive and defensive tendencies.     

Spiritual health,illness, and death

This essay outlines a view of spiritual health in middle life, particularly as it relates to an individual's confrontation with mortality. It was originally offered as part of a symposium on “Living and Dying” at the twenty-fifth reunion of the Harvard-Radcliffe Class of 1968 in Cambridge, Massachusetts, in June, 1993.     

Book reviews

Private Practice Youngstown, Ohio 44512     

Does Conscientiousness Explain the Relationship Between Integrity and Job Performance?

There is a meta-analytic evidence that scores on integrity tests are related to measures of overall job performance, but it is not clear why this relationship exists. One hypothesis that would account for this correlation is that both integrity and performance measures are related to the personality trait conscientiousness, and that statistically controlling for conscientiousness would substantially reduce the integrity-performance correlation. To test this hypothesis, we used the results of three meta-analyses to estimate the components needed to calculate the partial correlation between integrity and performance, controlling for conscientiousness. Partialling had little effect; the best estimate of the corrected zero-order and partial correlations between integrity and performance were 0.34 and 0.28, respectively. Sensitivity analyses suggest that imprecision in the estimates of the various components of this partial correlation cannot reasonably explain the small effects of partialling.     

Family Background,Social and Academic Capital,and Adolescents' Aspirations: A Mediational Analysis

In this study a mediational model was constructed to examine relationships between refined measures of childhood and adolescent social capital and the aspirations of adolescents with varying academic capital and from differing social status and ethnic backgrounds. Longitudinal data were collected from 460 16-year-old Australians and their parents from Anglo-Australian, Greek, and Southern Italian groups. Using partial least squares path modeling the findings suggest: (a) family background, childhood social and academic capital, and adolescents' social capital combine to have medium to large associations with adolescents' aspirations, and that the associations are larger for educational aspirations than for occupational aspirations and stronger for males than for females; (b) the mediational model is more successful in explaining family background differences in educational aspirations than variations in occupational aspirations; and (c) after taking into account social and academic capital, Greek males continue to have higher occupational aspirations than do Anglo-Australian and Southern Italian males, and sons of fathers with high social status continue to have higher occupational aspirations than do other male adolescents. The investigation indicates that within encompassing family backgrounds, differences in educational outcomes should be examined in relation to children's and parents' perceptions of social and cultural capital and to variations in children's academic capital.