The effects of interpolated US alone (USa) presentations on classical nictitating membrane conditioning in rabbit(Oryctolagus cuniculus)

The nictitating membrane (NM) response of 36 rabbits was classically conditioned using a 1,000-Hz tone (CS) paired with circumorbital shock (US) at a 250-msec CS-US interval. Two experimental groups received additional presentations of the US given alone (USa), either 30 seconds (Group E30) or 60 seconds (Group E60) following each CS-US pairing, and their performance was compared to that of control Ss (Group C60) which never experienced USa. Presentations of USa resulted in significant and approximately equal performance decrements in both experimental groups relative to the C60 controls. However, no significant differences among the groups appeared during an extinction phase. The effects of USa presentations were discussed in terms of Papsdorf’s consolidation interpretation and Rescorla’s (1967) contingency theory of conditioning, and appeared to favor the latter view. Additional analyses led to the conclusions that (1) the increased amplitude of the NM UR on paired CS-US trials relative to USa trials can be attributed, at least in part, to the simple laws of the reflex, independent of the conditioning processper se, and (2) the partial reinforcement extinction effects previously reported by Leonard and Theios (1968) cannot be attributed solely to the presence of USa in their continuous reinforcement control Ss.     

The role of stimulus material in determining release from proactive inhibition

The release from proactive inhibition (PI) paradigm has been widely used as a technique for exploring the encoding dimensions of short-term memory for verbal items. PI release data have been used not only to infer particular memory codes but also to index their relative salience. In the present study, the effects of manipulating the colour (red or black) in which the stimulus material is printed were investigated in two separate experiments. No release effect was obtained in the first, where common two-syllable words were presented. In the second, where consonant trigrams were presented, a large effect was found. Since the same colour feature was manipulated in each experiment, it is argued that this pattern of results has serious implications for the use of PI release data as a technique for mapping the encoding dimensions of short-term memory.     

Visual working memory in young children

Five experiments investigated immediate memory for drawings of familiar objects in children of different ages. The aims were to demonstrate younger children’s greater dependence on visual working memory and to explore the nature of this memory system. Experiment 1 showed that visual similarity of drawings impaired recall in young (5-year-old) children but not in older (10-year-old) children. Experiment 2 showed that younger and older children were affected in contrasting ways when the temporal order of recall was manipulated. Experiment 3 explored a recency effect found in backward recall and investigated its sensitivity to the presentation modality of materials used to produce retroactive interference (RI). For younger children, recency was reduced by visual but not by auditory-verbal RI; for older children, recency was more sensitive to auditoryverbal RI. Experiment 4 confirmed the effect of visual RI on visual recency in young children and showed that the same RI had little effect on their recall of spoken words. These results confirm younger children’s dependence on visual working memory. A final experiment showed that the effects of visual similarity and visual RI are additive, suggesting that they reflect different modes of accessing stored visuospatial information. Implications of these findings for developmental issues and for the nature of visual working memory are discussed.     

Perceptions of self-disclosure as a function of gender-linked variables

One hundred and sixty raters with either an androgynous, masculine, or feminine sex role orientation judged the intimacy and commonness of masculine and feminine self-disclosures attributed to either men or women speakers. Feminine disclosures were rated as significantly more intimate and more common than masculine disclosures. Masculine disclosures made by women were rated as significantly less common than either feminine disclosures by women, or masculine or feminine disclosures by men. Although rater sex role orientation had no significant effects, physical gender did. Female raters judged all disclosures as more intimate than male raters. Implications for future research are discussed.We express our appreciation to Camille DeBell, to the late JoAnn Mantovani, and to Christine Robitschek for their assistance in this research.     

The child's social network: Sex differences from three to six years

The social networks of 85 young children as they make the transition from a home-centered to a more school-centered existence is examined using longitudinal data. When the children were three and six years of age, their mothers completed a questionnaire of network structure; at six years both the child and mother independently reported the friends that the child would invite to a birthday party. The effects of age and sex of child on the number and daily contact with peers, adults, kin, nonkin, males, and females were found. As expected, as children reached formal school age they had increased contact with peers and decreased contact with kin, while adult contact remained fairly consistent over the three- to six-year age period. Sex differences were also apparent. As predicted, children as early as 3 years, and to an even greater extent at six years, showed more same-sex compared to opposite-sex peer contact. At six years both children and mothers reported more same- as compared to opposite-sex friends who would be invited by the child to a birthday party. The findings suggest how children's social networks, as shaped by their parents and themselves, provide a framework within which experience and interaction is structured to fit cultural norms.     

Imagery ability and the acquisition and retention of movements

In this study, we examined the relationship between imagery ability, as measured by the Movement Imagery Questionnaire (MIQ), and the acquisition, retention, and reacquisition of movements. Based on their MIQ scores, 10 subjects were selected for the following imagery groups: high visual/high kinesthetic (HH), high visual/low kinesthetic (HL), and low visual/low kinesthetic (LL). The subjects learned four movements to a criterion level. Before each trial, subjects kinesthetically imaged the movement about to be produced. Following each acquisition trial, subjects were provided visual feedback. The acquisition phase was followed by a 2-day retention interval, a retention test consisting of three trials on each movement (no feedback provided), and a reacquisition phase. The HH group acquired the movements in the least number of trials, the LL group required the greatest number of trials, and the HL group required an intermediate number of trials. The data for the reacquisition phase showed the same trend. There was only weak evidence for a relationship between imagery ability and the retention of the movements. These findings support the position that high imagery ability facilitates the acquisition, but probably not the short term retention, of movements.