Velocity perception for sounds moving in frequency space

In three experiments, we considered the relative contribution of frequency change (Δf) and time change (Δt) to perceived velocity (Δf/Δt) for sounds that moved either continuously in frequency space (Experiment 1) or in discrete steps (Experiments 2 and 3). In all the experiments, participants estimated “how quickly stimuli changed in pitch” on a scale ranging from 0 (not changing at all) to 100 (changing very quickly). Objective frequency velocity was specified in terms of semitones per second (ST/s), with ascending and descending stimuli presented on each trial at one of seven velocities (2, 4, 6, 8, 10, 12, and 14 ST/s). Separate contributions of frequency change (Δf) and time change (Δt) to perceived velocity were assessed by holding total Δt constant and varying Δf or vice versa. For tone glides that moved continuously in frequency space, both Δf and Δt cues contributed approximately equally to perceived velocity. For tone sequences, in contrast, perceived velocity was based almost entirely on Δt, with surprisingly little contribution from Δf. Experiment 3 considered separate judgments about Δf and Δt in order to rule out the possibility that the results of Experiment 2 were due to the inability to judge frequency change in tone sequences.     

Methodological and practical issues regarding phenomenological subtypes of highly suggestible individuals: A response to Kumar

A hypnotic induction produces different patterns of spontaneous experiences across individuals. The magnitude and characteristics of these responses covary moderately with hypnotic suggestibility, but also differ within levels of hypnotic suggestibility. This study sought to identify discrete phenomenological profiles in response to a hypnotic induction and assess whether experiential variability among highly suggestible individuals matches the phenomenological profiles predicted by dissociative typological models of high hypnotic suggestibility. Phenomenological state scores indexed in reference to a resting epoch during hypnosis were submitted to a latent profile analysis. The profiles in the derived four-class solution differed in multiple experiential dimensions and hypnotic suggestibility. Highly suggestible individuals were distributed across two classes that exhibited response patterns suggesting an inward attention subtype and a dissociative subtype. These results provide support for dissociative typological models of high hypnotic suggestibility and indicate that highly suggestible individuals do not display a uniform response to a hypnotic induction.     

Cultural Missteps and Ethical Considerations with Indigenous Populations: Preliminary Reflections from Northeastern Ontario,Canada

Within this submission the authors share their experiences as a blended research team with Aboriginal community and mainstream academic researchers. The team has collaborated since 2004 on several externally funded research projects. Initially, the team engaged in research through mainstream methodologies. In the process, the community co-researchers and participants were silenced through mainstream cultural practices that were unfamiliar and meaningless in Wikwemikong culture. More recently, the team has employed a community conceived de-colonizing methodology, developed from within Wikwemikong Unceded Indian Reserve. Within this submission, the authors will highlight their initial cultural missteps, followed by more recently utilized culturally relevant approaches. It is proposed that what might be ethically sound research with mainstream participants and among mainstream researchers can silence and subvert practices among those from marginalized groups/cultures. Provisional suggestions are offered for researchers interested in co-researching in Aboriginal communities.     

Crossed-categorization, evaluation, and face recognition

We investigated the relationship between evaluative intergroup bias and biased errors in intergroup face recognition after crossed-categorization (the combination of two social categories in defining a target of perception). Although evaluative bias and recognition bias often operate in parallel, we draw on two previously unconnected literatures to predict a divergence between these two processes after crossed-categorization. We tested this hypothesis by assessing participants’ evaluations of and recognition of targets who shared two ingroups with participants, targets who shared only one ingroup with participants, and targets who shared neither ingroup. Consistent with predictions, targets’ shared and unshared group memberships combined additively to affect evaluation, but targets who shared two ingroup memberships were better recognized than all other category combinations. These results document the relationship between evaluative bias and recognition bias after crossed-categorization and indicate that crossed-categorization affects evaluative bias and recognition bias in different ways.     

Tempo sensitivity in isochronous tone sequences: the multiple-look model revisited

Factors affecting tempo sensitivity in isochronous tone sequences were investigated in two experiments. Participants listened to tones in sequence conditions in which the number of time intervals in isochronous standard and comparison sequences was varied, and they were asked to judge the tempo of the comparison relative to the standard. When the duration of the standard interval was held constant, tempo sensitivity was affected by the number of comparison intervals, but not by the number of standard intervals. In contrast, when the duration of the standard interval was varied randomly from trial to trial, tempo sensitivity was affected by the number of intervals in both sequences. The present findings are discussed in the context of a generalized multiple-look model that posits independent contributions of both sequences to tempo sensitivity. Quantitative model fits suggest that the relative contribution of the number of the standard intervals to tempo thresholds depends on (1) the availability of a stable long-term referent for the standard tempo and (2) a priori knowledge about the number of standard intervals.     

The Diabetes Family Behavior Checklist: A Psychometric Evaluation

The Diabetes Family Behavior Checklist (DFBC) assesses supportive and non-supportive parental behavior specific to diabetes management via parent and child reports. The DFBC was administered to 133 children with type 1 diabetes (T1D) and their caregivers. Subsequent analysis verified the two-factor structure of the DFBC corresponding to positive and negative support behaviors. Internal consistency was high for DFBC scores. Moderate to strong correlations with other measures of diabetes-specific familial behaviors, adherence, and metabolic control support the validity of the DFBC. Clinical application of the DFBC is discussed.     

Selective antagonism of GABAA receptor subtypes: an in vivo approach to exploring the therapeutic and side effects of benzodiazepine-type drugs

Benzodiazepines (BZs) are clinically used as anxiolytic, hypnotic, anticonvulsant, and antispasmodic drugs. Research using transgenic mouse models has suggested that the effects of BZs involve multiple subtypes of the gamma-aminobutyric acid type A (GABAA) receptor, identified by specific a subunits (alpha1, alpha2, alpha3, alpha5). This review discusses the experimental uses of b-carboline-3-carboxylate-t-butyl ester (betaCCT), a drug that binds preferentially to the GABAA alpha1 subtype but exerts no action (ie, is a pharmacologic antagonist at the GABAA alpha1 subtype receptor). betaCCT blocks the anxiolytic-like effects of BZs, although studies in primates suggests this antagonism may reflect multiple receptor populations. betaCCT antagonized the ataxic but not muscle relaxant effects of BZs, a finding that implicates the GABAA alpha1 subtype receptor in ataxia but not muscle relaxation. The potential clinical utility of betaCCT is discussed, both in terms of treatment (ie, hepatic encephalopathy) and as a diagnostic imaging agent. Altogether, these results indicate that subtype-selective antagonists represent a useful approach to studying receptor mechanisms underlying the behavioral effects of BZ-type drugs.     

Family narrative interaction and children's sense of self

Family narratives about the shared past may be a particularly significant site for preadolescents' emerging sense of self both as an individual and as a member of a unified family. We examined the relations between family narrative interaction style when reminiscing and preadolescents' sense of self. Results indicated three narrative interaction styles that describe the extent to which families discuss or fail to discuss their past in integrated and validating ways. Specifically, conversations with a coordinated perspective incorporated information from all members and were related to higher self-esteem, especially in girls. Conversations with an individual perspective, in which family members took turns telling their thoughts and feelings about the event without integration among the perspectives, were associated with a more external locus of control, especially in boys. Conversations with an imposed perspective, in which one family member was in charge of the conversation or in which unpleasant exchanges between members occurred, were not associated with either self-esteem or locus of control. Implications of these narrative interaction styles for children's developing sense of self are discussed.     

The Role of Parent-Child Interaction in Community-Based Youth Relationship Education

This study sought to answer whether there is an association between parent-adolescent relationship processes and adolescents' awareness of unhealthy relationships. Adolescent awareness of unhealthy relationships was measured using a retrospective pre/post survey after participation in a relationship education (RE) program that has been adapted for use with youth. Supportiveness in the parent-child relationship was measured at pre-test. The sample consisted of 6984 adolescents aged 11–18. The sample was fairly representative of the areas from which it was drawn: 54% European American, 36% African American. Results revealed significant improvement in awareness of unhealthy relationships after program participation. Greater supportiveness predicted greater change in the outcome. This suggests that RE programs targeted at youth should specifically inform parents of goals so that they may be reinforced in parents' interactions with their adolescents.