Survey return rates as a function of priority versus first-class mailing

Prior research indicates survey procedures that signal significance and individualized mailings have higher response rates. Thus, it was hypothesized that surveys delivered via Priority mail would result in higher return rates than surveys delivered via First-Class. 260 surveys were sent to individuals randomly selected from lists of licensed physical and behavioral healthcare providers in Alaska and New Mexico. Half of the selected individuals were assigned randomly to receive mailings using Priority mail, the other half received First-Class mailings. Return rate was 39% for First-Class and 35% for Priority. Z tests of proportion indicated no statistically significant differences between methods. Given increased costs with no resultant increase in response rate, sending surveys to potential participants via Priority mail does not appear warranted.     

Improving return rates for health-care outcome

The objective was to test two methods of reducing loss of data in follow-up by abbreviating the questionnaire and offering a token monetary incentive. Primary data were collected between September 14, 1998 and July 23, 1999 from an adult psychiatric population, representing about 50% of all patients, all of whom agreed to participate in a quality-assurance monitoring program. Briefer components of the SF-36 Health Status Survey were expected to yield higher return rates than would the SF-36 plus a form assessing amount of treatment received. Small monetary incentives were expected to result in higher return rates also. Patients were randomly assigned to the groups (n = 73 each). Abbreviation of the questionnaire and use of a monetary incentive each reduced attrition by 10%. A diminishing returns effect for both methods was observed. Further study of a possible interaction between the questionnaire's length and monetary incentive is recommended.     

Independence versus interference in the perceptual processing of letters

Several experiments are reported that help resolve the discrepancy between studies indicating that letters are perceived independently and studies showing perceptual interference between letters. Two variables were examined which, based on the existing literature, appeared to be important in distinguishing between the perceptual independence and perceptual interference studies. In Experiment 1, the amount of spatial separation between letters was varied. Surprisingly, the letters were perceived independently, regardless of the amount of separation or degree of similarity between them. Thus, it was concluded that the amount of interletter separation is not sufficient to account for the difference between studies demonstrating independence and those demonstrating interference. The results of Experiments 2 and 3 indicated that the type of perceptual limitation that is used to control response accuracy determines whether perceptual independence or interference is obtained. Specifically, perceptual interference was obtained only under masking conditions, whereas perceptual independence was obtained only under energy-limited (no-mask) conditions. Experiment 4 extended these results, indicating that perceptual interference is obtained under prestimulus as well as poststimulus masking conditions. Several interpretations of the perceptual interference data are considered, and it is concluded that the data can best be accounted for in terms of a model based on the principle of feature-specific inhibition.     

One year return to custody rates among co-disordered offenders

The extent to which therapeutic community (TC) methods meet the treatment needs of offenders with substance abuse disorders and co-occurring psychiatric disorders in prison is largely unknown. Very little research has been conducted with this population. The purposes of this study were to generate profiles of co-disordered drug offenders entering TC treatment in prison and to assess their post-release reincarceration rates, compared with drug offenders without psychiatric disorders. Extensive intake interview data for over 8,500 men and women who received treatment in one of 16 prison-based TCs in California were analyzed to produce profiles of co-disordered participants. Intake data come from a 5 year process and outcome evaluation of the California Department of Corrections' (CDC's) treatment initiative. Post-release reincarceration rates come from the CDC's Offender Based Information System. Compared with non-psychiatric disordered drug offenders, co-disordered offenders had substantially more severe substance abuse and criminal histories, in addition to their psychiatric impairment, at treatment entry. Logistic regression results indicated that, compared with drug offenders without psychiatric illness, co-disordered offenders were significantly more likely to be reincarcerated during the first year of their parole. These results suggest that prison treatment programs may need to use more comprehensive diagnostic assessments at intake to assess the diverse mental health needs of drug offenders with co-occurring psychiatric disorders and to develop treatment approaches suitable for this population.     

Dissociating congruence effects in letters versus shapes: Kanji and kana

In order to consolidate the dissociation in feature integration found in earlier studies between letters of the Roman alphabet and corresponding pseudo-letters, the present study used kanji and kana and corresponding pseudo-letters, presented visually, either in isolation or surrounded by congruent or incongruent shape, as targets in a choice-response task with three different response criteria. When the criterion was shape, congruence effects were obtained for both real and pseudo-letters. With the second and third response criteria this result was found for pseudo-letters, but not for letters. These criteria either involved distinguishing between letters and visually similar pseudo-letters or distinguishing between visually similar letters. The dissociation of congruence effects between letters and pseudo-letters was therefore shown to depend on visual similarity between targets, independent of their category. This effect was found to be robust for kanji but not for kana, which is related to distinctions between these two writing systems.     

Inhibition of return and the attentional set for integrating versus differentiating information.

Cuing a location with an uninformative cue leads to a facilitatory effect at that location shortly afterward and later (about 300 ms) to a negative effect called inhibition of return (IOR). Until recently, it was argued that IOR occurs in detection and localization tasks, but not in discrimination tasks. However, the authors of several recent studies have demonstrated IOR effects in discrimination tasks, although at a later cue-to-target stimulus onset asynchrony (SOA). In this study, the authors examined why IOR occurs at a later SOA in discrimination tasks. In Experiments 1 and 2, different time courses of exogenous cuing effects in detection and discrimination tasks were established. In Experiment 3, the authors examined the role of an attentional set on the time course of exogenous cuing effects by manipulating the proportion of trials in which a distractor is presented in the location opposite the target. A new framework for understanding exogenous cuing effects and their dependence on endogenous attention is proposed.     

Reliability of estimates of return rates as a measure of public attitudes to violence

An analysis of letters placed in Mobile, Alabama and Sioux Falls, South Dakota (ns = 500 and 600) showed return rates among the several addresses were essentially uncorrelated (rs = -.11 to .08) so interpoll reliability is lacking.     

Different rates of forgetting following study versus test trials

Two experiments investigated recall following two study conditions, (1) repeated test: a study trial followed by multiple recall trials, and (2) repeated study: multiple study trials with no tests. At a retention interval of 5 minutes, repeated study produced a higher level of recall than repeated test. When the retention interval was extended, forgetting was much more rapid in the study condition, with the repeated test manipulation leading to higher recall at an interval of 7 days. We conclude that study and test trials have different effects upon memory, with study trials promoting memory acquisition, and test trials enhancing the retrieval process itself, which protects against subsequent forgetting.     

Different rates of forgetting following study versus test trials

Two experiments investigated recall following two study conditions, (1) repeated test: a study trial followed by multiple recall trials, and (2) repeated study: multiple study trials with no tests. At a retention interval of 5 minutes, repeated study produced a higher level of recall than repeated test. When the retention interval was extended, forgetting was much more rapid in the study condition, with the repeated test manipulation leading to higher recall at an interval of 7 days. We conclude that study and test trials have different effects upon memory, with study trials promoting memory acquisition, and test trials enhancing the retrieval process itself, which protects against subsequent forgetting.     

Inhibition of return for faces

Inhibition of return (IOR) refers to slower reaction times when a target appears unpredictably in the same location as a preceding cue, rather than in a different location. In the present study, frontal images of human faces were presented intact as face configurations, were rearranged to produce scrambled-face configurations, or were pixilated and randomized to produce nonface configurations. In an orienting paradigm designed to elicit IOR, face and scrambled-face stimuli were used as cues (Experiment 1), as targets (Experiment 2), or along with pixilated nonface stimuli as both cues and targets (Experiment 3). The magnitude of IOR for subsequent localization targets was unaffected by cue configuration. Likewise, the magnitude of IOR was unaffected by target configuration. These results suggest that IOR is a "blind" mechanism that is unaffected by the mere occurrence of biologically relevant cue and target stimuli.     

Lateral masking for letters with unlimited viewing time

Linear arrays of 1, 8, and 9 letters were exposed while S read off the items of the letter sequence while maintaining constant fixation. By this procedure, serial position effects were studied in the absence of requirements for scanning the array quickly, as in a tachistoscopic display, and for remembering a large number of items, as in a delayed whole report. Despite the absence of these requirements, typical serial position curves were generated. Serial position effects were partially ameliorated by the introduction of blank spaces into the array. Performance was influenced both in the immediate vicinity of the blank spacings, as well as extending over a large portion of the array. The data were interpreted in terms of lateral masking effects associated with adjacent elements.     

Base rates versus sample accuracy: competition for control in human matching to sample

People often place undue weight on specific sources of information (case cues) and insufficient weight on more global sources (base rates) even when the latter are highly predictive, a phenomenon termed base-rate neglect. This phenomenon was first demonstrated with paper-and-pencil tasks, and also occurs in a matching-to-sample procedure in which subjects directly experience case sample (cue) accuracy and base rates, and in which discrete, nonverbal choices are made. In two nonverbal experiments, subjects were exposed to hundreds of trials in which they chose between two response options that were both probabilistically reinforced. In Experiment 1, following one of two possible samples (the unpredictive sample), either response was reinforced with a .5 probability. The other sample (predictive) provided reinforcement for matching on 80% of the trials in one condition but in only 20% of the trials in another condition. Subjects' choices following the unpredictive sample were determined primarily by the contingencies in effect for the predictive sample: If matching was reinforced following the predictive sample, subjects tended to match the unpredictive sample as well; if countermatching the predictive sample was generally reinforced, subjects tended to countermatch the unpredictive sample. These results demonstrate only weak control by base rates. In Experiment 2, base rates and sample accuracy were simultaneously varied in opposite directions to keep one set of conditional probabilities constant. Subjects' choices were determined primarily by the overall accuracy of the sample, again demonstrating only weak control by base rates. The same pattern of choice occurred whether this pattern increased or decreased rate of reinforcement. Together, the results of the two experiments provide a clear empirical demonstration of base-rate neglect.     

Gay marriage affiliation and location in return of lost letters: reply to Waugh, Plake, and Rienzi (2000)

Reinspection of Waugh, Plake, and Rienzi's 2000 data allowed for several additional analyses. Statistical confirmation was found for no more negative attitudes toward gay marriage as measured by returned responses among churchgoers than among the general public. Confirmation was also found for their previous conclusion that the putative gay marriage controversy among Christian church attendees would be greater than among the general public, but for reasons different from those they proposed. Finally, it is argued that the limitations for the lost letter technique in "prohibiting fine distinctions" is not always correct because their analysis of one research question seemed not too subtle a distinction for the technique.     

How one gambles if one must: Effects of differing return rates on multistage betting decisions

In the multistage betting game (MBG), a decision maker (DM) is provided with some capital x which he is required to bet over m (m > 1) mutually exclusive and collectively exhaustive alternatives, each of which occurs with probability p_i (p_i > 0, i = 1,…, m; Σ_{i = 1}^mp_i = 1). If y_i is bet on alternative i (y_i ≥ 0, Σ_{i = 1}^my_i = x) and alternative i obtains, the DM's capital for the next stage is y_ir_i, (r_i > 0). The MBG lasts until either the DM loses his capital or N stages elapse, whichever comes first. Each of six subjects participated in six sessions consisting of several hundred 3-alternative MBG stages. A within-subject design assigned negative expected value (EV) bets to the first three sessions and positive EV bets to three more sessions. Significant effects were found due to return rate, capital size, homogeneous runs of either wins or losses, and individual differences. Four maximization of expected utility and two minimization of risk models were presented and tested. A modified logarithmic utility model is proposed, which provides the best fit to the data. The implications of the results and directions for further research are briefly discussed.     

Evidence for scanning with unilateral visual presentation of letters

When letters and words are presented tachistoscopically, material from the right visual field (RVF) can be reported more accurately than that from the left visual field (LVF). The RVF superiority may reflect either left hemispheric dominance for language or directional scanning. Previous studies have deliberately focused on the cerebral asymmetry factor while "controlling" scanning and, thus, have cast some doubt on the potency of the scanning factor. Two experiments were conducted to show that scanning can induce a RVF superiority comparable to that often associated with cerebral asymmetry. The first experiment required bilingual subjects to report six English or six Hebrew letters, shown briefly in either the LVF or RVF, with order of report controlled. A RVF superiority found with English characters was matched by an equal but opposite LVF effect with Hebrew. In a second experiment, five English characters were shown briefly in either the LVF or RVF, and subjects had to identify a single character indicated by a post exposural cue. Using a spatial cue to by pass scanning, there were no field differences; with an ordinal position cue--a procedure thought to force scanning--there was a strong RVF superiority. The results show clearly that scanning can induce visual field differences.     

Partially selective search of memory for letters and digits

Three experiments failed to provide evidence that subjects could search just the digits, or just the letters, of a mixed list of digits and letters in deciding whether a probe item was a member of the list. Providing a precue as to the category of the probe shortly before the presentation of the probe decreased the time needed to encode it, but did not change the memory search process. Repeating the category of the probe from one trial to the next, however, did change the pattern of memory search. A "partially selective search" model was proposed which claimed that a mixed list was stored as two categorized sublists, and that a self-terminating search of the sublists could occur in which the first sublist searched was the one which had been probed on the previous trial.     

An alternative for judging confusability of visual letters.

Numerical values for shared distinctive features were derived from Gibson's (1) feature analysis of the 26 uppercase alphabet letters. Due to the lack of agreement among the empirical matrices, it is proposed that this more general table is a useful and practical approach for judging confusability of visual letters for uppercase items. Reaction time data from a Posner-type of letter-matching task support the effectiveness of the table for judging visual confusability among uppercase letters.     

Effects of small monetary incentives on return rates of a health survey to adults in rural areas

This study assessed differences in response rates to a mailed health survey by adults in two neighboring rural midwestern counties with differential incentives, of dollar 2.00 and dollar 5.00. Potential respondents in each county were randomly selected from a commercial database of residents' addresses. County "F" respondents (n = 541) which were 57% female and 95% Euro-American having a mean age of 47.3 yr. (SD= 16.9), received the dollar 5 incentive. County "H" respondents (n= 514) were 63% female, 95% Euro-American, had a mean age of 49.0 yr. (SD= 14.7), and received a S2 incentive. The response rates were 71% using the dollar 2 incentive and 73% using the dollar 5 incentive. These were not significantly different by chi-square test. The more cost-effective incentive for increasing the response rate of adults in this rural midwestern sample was to code the envelopes and use a dollar 2.00 rather than dollar 5.00 incentive, a cost per returned survey of dollar 5.24 versus dollar 9.13, respectively. The findings support Dillman's principle of diminishing returns as the size of the incentive goes up.