Effects of across-chapter signals on recall of text.

Investigated 2 forms of across-chapter text signals: "preview" sentences, which signal contents in upcoming chapters, and "recall" sentences, which are backward signals that signal back to previously read materials. These signals may influence readers' recall of text material by guiding their attention during reading. They also may facilitate readers' activation of memory representations of previous content, thereby enhancing integrative processing. Seven experiments examined the effects of preview and recall sentences. The results of 4 experiments indicated a clear signaling effect across chapters. In Exp IV, there were significantly longer inspection times and reaction times (RTs) to secondary probes in signaled than in unsignaled paragraphs. The results of Exp V indicate that backward-signaled materials were recalled at a significantly greater rate than unsignaled materials. In addition, the signaled materials in Ss' recalls were clustered together at a significantly greater rate than unsignaled materials. Results of Exp VII indicate significantly longer inspection times and RTs to secondary probe tasks in the reading of paragraphs containing recall sentences than in the reading of paragraphs not containing signals. Results indicate that across-chapter signals have a strong effect on readers' recall of prose. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of number signals on reading and recall.

Examined the influence of number signals (i.e., numbers or number words preceding important textual information) on text recall. 120 undergraduates read and recalled 2 texts containing 10 target sentences each. Reading times were recorded for each target sentence. For half of the Ss, the target sentences were preceded by numbers indicating their organization; for the other half, the target sentences were not signaled. Half of the Ss completed a free-recall task, while the remainder completed a cued-recall task. Results indicate that Ss read target sentences more slowly if they were signaled than if they were unsignaled. Ss' recalls of target information followed the text organization more closely if the sentences were signaled. Signaling aided free recall of target sentences, but had no effect on cued recall. Results demonstrate that number signals directed attention to the sentences they marked, led to better encoding of the organization of target information, and influenced the process of recalling the target information. (33 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Backward inhibitory conditioning with signaled and unsignaled unconditioned stimuli: Distribution of trials across days and intertrial interval.

Through summation tests in conditioned suppression with rats we assessed the effects of distribution of trials across days (Experiment 1) and intertrial interval (ITI) (Experiment 2) on the degree of backward conditioned inhibition established through signaled and unsignaled unconditioned stimuli (USs). Two backward conditioned inhibitory stimuli (CS-s) were established within subjects: One backward CS- followed signaled shocks; the other followed unsignaled shocks. After 12 daily sessions (Experiment 1), the signaled backward CS- was strongly inhibitory and significantly more inhibitory than the unsignaled backward CS-. When the same number of trials occurred in a single long session, performances to both CS-s converged at moderate levels. At the 90-s ITI, (Experiment 2) the signaled and unsignaled backward CS-s were nearly equivalent in effectiveness. When the ITI was 540 s, performances diverged, and signaled backward CS- was substantially more effective; the longer ITI facilitated inhibitory backward conditioning based upon signaled USs but prevented the development of inhibitory backward conditioning based upon unsignaled USs. These functionally opposite effects on backward conditioned inhibition, depending on whether the US was signaled or not, are anticipated by Wagner's "standard operating procedure" (SOP) model of short-term memory. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Signaling, notetaking, and field independence–dependence in text comprehension and recall.

Experiment 1 involved having undergraduates take or not take notes while listening to two passages with or without signals (structural cues). When notetaking on signaled text, recall was maximized; on nonsignaled text, recall was minimized. Because notetakers appeared to rely on signals in processing text, it seemed that notetaking produced a structure-search process. Regression analyses suggested that notetaking in the presence of signals enhanced recall of field-dependent (FDs) but not field-independent learners (FIs). Experiment 2 directly examined this issue in a reading context. Increased high-level recall across passages of the same overall structure (a transfer of structure effect) was found for FIs only in the non-notetaking conditions and for the FDs only in the notetaking conditions. Thus, FIs seemed to spontaneously use a tacit structure strategy when left to their own devices and FDs appeared to immediately display powerful structuring skills when induced to do so via notetaking. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Context extinction following conditioning with delayed reward enhances subsequent instrumental responding.

In Experiment 1, delayed reward generated low response rates relative to immediate reward delivered with the same frequency. Lister rats exposed to delayed reward subsequently responded at a higher rate in extinction if they received nonreinforced exposure to the conditioned context after instrumental training and prior to test, compared with animals that received home cage exposure. In Experiment 2, a signaled delay of reinforcement resulted in higher rates than an unsignaled delay. Nonreinforced exposure to the conditioning context elevated response rate for subjects in the unsignaled condition relative to a home cage group, but had no effect on response rates for subjects that had received the signaled delay. In Experiment 3, following an unsignaled reinforcement delay, groups receiving either no event or signaled food in the context responded faster in extinction than groups receiving no context exposure or unsignaled food. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of signaling topic structure on text recall.

Two experiments studied effects of signaling devices (headings, overviews, and summaries) on text memory. In Exp 1, Ss read a text with or without signals, then recalled the topics of the text. Signaling produced better memory for the topics and their organization. In Exp 2, Ss recalled the content of the text they read, and recalls were scored for the number of accurately recalled ideas. Signals produced recalls that were better organized by text topics. Signals also influenced the distribution of recall of ideas: Ss remembered more topics but recalled less about each accessed topic if the text they read contained signals than if it did not. The results are interpreted as supporting a model in which signals influence readers' representations of a text's topic structure, which, in turn, is used to guide the recall of text content. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Attenuation and enhancement of instrumental responding by signals for reinforcement on a variable interval schedule.

In three experiments we used pigeons responding on a variable interval schedule to examine the effects of signaling reinforcement on instrumental performance. Using a four-component multiple schedule, we found in Experiment 1 that when reinforcement was delayed by 0.5 s for two of the components, response rates were attenuated by signaling reinforcement relative to performance in the unsignaled delay condition. A delay of 3 s in the remaining two components resulted in an enhancement of responding when the delay was signaled. An enhancement of responding occurred when we used a scheduled 0.5-s delay when the procedure ensured that responding was prevented during the delay interval by extinguishing the keylight (Experiment 2) or by resetting the delay timer when responses were emitted during the delay (Experiment 3). These results are discussed with reference to the theories of signaling reinforcement during instrumental responding. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Activation of human neutrophil procollagenase by nitrogen dioxide and peroxynitrite: a novel mechanism for procollagenase activation involving nitric oxide

Electrolytic lesions of the dorsal hippocampus (DH) produce deficits in both the acquisition and expression of conditional fear to contextual stimuli in rats. To assess whether damage to DH neurons is responsible for these deficits, we performed three experiments to examine the effects of neurotoxic N-methyl-D-aspartate (NMDA) lesions of the DH on the acquisition and expression of fear conditioning. Fear conditioning consisted of the delivery of signaled or unsignaled footshocks in a novel conditioning chamber and freezing served as the measure of conditional fear. In Experiment 1, posttraining DH lesions produced severe retrograde deficits in context fear when made either 1 or 28, but not 100, days following training. Pretraining DH lesions made 1 week before training did not affect contextual fear conditioning. Tone fear was impaired by DH lesions at all training-to-lesion intervals. In Experiment 2, posttraining (1 day), but not pretraining (1 week), DH lesions produced substantial deficits in context fear using an unsignaled shock procedure. In Experiment 3, pretraining electrolytic DH lesions produced modest deficits in context fear using the same signaled and unsignaled shock procedures used in Experiments 1 and 2, respectively. Electrolytic, but not neurotoxic, lesions also increased pre-shock locomotor activity. Collectively, this pattern of results reveals that neurons in the DH are not required for the acquisition of context fear, but have a critical and time-limited role in the expression of context fear. The normal acquisition and expression of context fear in rats with neurotoxic DH lesions made before training may be mediated by conditioning to unimodal cues in the context, a process that may rely less on the hippocampal memory system.     

Processing and recall differences among selective details.

Three experiments examined processing and recall differences associated with 2 different types of seductive details (i.e., highly interesting, but unimportant, text segments). Experiment 1 provided evidence of 2 different types of seductive details: those that are less interesting when read in isolation (context dependent) and those that are equally interesting in context or isolation (context independent). Experiment 2 found that context-dependent seductive details took longer to read and were recalled better than main ideas. Context-independent seductive details were recalled as well as context-dependent seductive details, but did not require more reading time than main ideas. Experiment 3 found that including seductive details did not interfere with overall story recall or recall of main ideas. Suggestions are made for future research that would enhance a theory of seductive details. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Engaging texts: Effects of concreteness on comprehensibility, interest, and recall in four text types.

Concreteness was investigated as a text feature that engaged readers' comprehension, interest, and learning in 4 text types: persuasion, exposition, literary stories, and narratives. Three concrete and 3 abstract texts were selected in each text type. Concrete and abstract titles served as recall cues and to investigate title concreteness effects. In 2 experiments, undergraduates read the texts and either provided written recalls or rated them for familiarity, concreteness, interestingness, and comprehensibility. Concrete texts were recalled better than abstract texts, although the magnitude of the advantage varied across text types. Concreteness was overwhelmingly the best predictor of overall comprehensibility, interest, and recall. Effects of title concreteness varied across text types. Results extend the findings of M. Sadoski, E. T. Goetz, and J. B. Fritz (see records 1993-36182-001 and 1993-32227-001) and are consistent with dual coding theory. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Relative aversiveness of signaled vs. unsignaled avoidable and escapable shock situations in humans.

Conducted 2 experiments dealing with signaled and unsignaled shock, using a total of 18 male college students. In Exp I 6 Ss avoided shock, and in Exp II 12 Ss escaped shock by pressing one button under an unsignaled shock condition. By pressing on a separate button, Ss could change to signaled avoidance (Exp I) or signaled escape (Exp II). All Ss changed from the unsignaled to signaled condition whether shock was avoidable or escapable. 6 Ss were also given a chance to change from signaled to unsignaled escapable shock. Changeover responding remained at or near operant levels for these Ss. Comparing results of this study with studies using the rat revealed much similarity but some differences. Differences depended upon whether an escapable or avoidable procedure was used. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Formation of tone–US associations does not interfere with the formation of context–US associations in pigeons.

In four experiments we investigated whether signaled and unsignaled unconditional stimuli (US) presentations resulted in differential context conditioning. Experiments 1 and 2 showed that the presence of a tone during grain presentation facilitated the formation of tone–food associations in pigeons. Experiment 2 also showed that the acquisition of associative value by the tone did not diminish associations between context and the US. Experiment 3 showed that signaled USs did not interfere with the acquisition of context–US associations, and Experiment 4 showed that even when the signal was extensively pretrained, context–US associations could not be blocked. The results of these experiments are inconsistent with conditioning models that require competition between cues and contexts for associative value. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Teaching readers about the structure of scientific text.

Adults may have difficulty in reading and retaining scientific text because they are unaware of the text's top-level structure. Experiment 1 revealed that college students had difficulty in sorting passages into categories on the basis of text structures, such as generalization, enumeration, sequence, classification, and compare/contrast. In Experiment 2, junior college chemistry students either received approximately 8 hr of training in how to discriminate among and use text structures found in their chemistry textbook (trained group) or engaged in unrelated activities (control group). All students took matched pretests and posttests in which they read biology passages and then freely recalled the passages and answered comprehension questions. On the recall test, the trained group showed a substantial pretest-to-posttest gain in recall of high conceptual information but not in recall of low conceptual information, whereas the control group showed no substantial gains. On the comprehension test, the trained group showed a substantial pretest-to-posttest gain in answering application questions and a lesser gain in answering literal questions, whereas the control group showed no substantial gains. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

How prior knowledge, WMC, and relevance of information affect eye fixations in expository text.

This study examined how prior knowledge and working memory capacity (WMC) influence the effect of a reading perspective on online text processing. In Experiment 1, 47 participants read and recalled 2 texts of different familiarity from a given perspective while their eye movements were recorded. The participants' WMC was assessed with the reading span test. The results suggest that if the reader has prior knowledge related to text contents and a high WMC, relevant text information can be encoded into memory without extra processing time. In Experiment 2, baseline processing times showed whether readers slow down their processing of relevant information or read faster through the irrelevant information. The results are discussed in the light of different working memory theories. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of structure strategy training and signaling on recall of text.

Younger and older adults participated in 9 hr of either structure strategy training, interest strategy training, or no training. Both trained groups reported positive changes in reading, but only the structure strategy group showed increased total recall from a variety of texts and an informative video. Structure strategy training increased the amount of information remembered as well as recall of the most important information. This training affected the organization of recall and was critical for producing readers who could use the structure strategy consistently across a variety of expository texts. In addition, it helped learners use signals in text more effectively. There was an additive effect of training plus signaling for use of the structure strategy consistently across five passages. The strategy switch hypothesis was supported, indicating that signaling affects encoding rather than retrieval processes. The findings have implications for both reading and writing. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Effects of organizational signals on text-processing strategies.

Two hypotheses about how organizational signals influence text recal1 were tested: (a) that signals cause readers to change their text-processing strategies and (b) that signals facilitate readers' attempts to encode topic structure information but do not cause a shift in strategies. College students read and recalled a text that contained either no signals or contained headings, overviews, or summaries emphasizing the text's topic structure. At recall, students either received no cues or were reminded of the text's topics. Providing cues facilitated recall much more in the 3 conditions involving signaling than in the no-signals condition. The results are consistent with the hypothesis that organizational signals induce readers to change their text-processing strategies. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Memory for music: Effect of melody on recall of text.

The melody of a song, in some situations, can facilitate learning and recall. The experiments in this article demonstrate that text is better recalled when it is heard as a song rather than as speech, provided the music repeats so that it is easily learned. When Ss heard 3 verses of a text sung with the same melody, they had better recall than when the same text was spoken. However, the opposite occurred when Ss heard a single verse of a text sung or when Ss heard different melodies for each verse of a song; in these instances, Ss had better recall when the text was spoken. Furthermore, the experiments indicate that the melody contributes more than just rhythmic information. Music is a rich structure that chunks words and phrases, identifies line lengths, identifies stress patterns, and adds emphasis as well as focuses listeners on surface characteristics. The musical structure can assist in learning, in retrieving, and if necessary, in reconstructing a text. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Associative modulation of the orienting response: Distinct effects revealed by hippocampal lesions.

The ability of auditory stimuli to modulate rats' tendency to orient to visual targets was assessed. In Experiment 1, trials where an auditory stimulus (A) signaled one visual array (X) were intermixed with unsignaled presentations of a second array (Y). Comparison of the orienting responses (ORs) to X and Y revealed that A produced a transient (unconditioned) and an emerging (conditioned) disruptive influence on the OR to X. In Experiments 2 and 3, trials where A signaled X were intermixed with others where another auditory stimulus (B) signaled Y. Stimulus A's ability to modulate the OR to X was then assessed by presenting A prior to test arrays containing both X and Y Control rats were more likely to orient to Y than X (Experiments 2 and 3) and rats with excitotoxic lesions of the hippocampus were more likely to orient to X than Y (Experiment 3). These results show that auditory stimuli exert distinct modulatory influences on the OR to visual stimuli with which they are associated. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Explanatory analogies can help children acquire information from expository text.

In this experiment, we investigated whether children can profit from the use of explanatory analogies to acquire information from expository text. Five-year-old (n?=?24) and seven-year-old (n?=?34) children listened to four texts describing relatively unfamiliar topics with or without explanatory analogies. The children were asked to recall the information described in the texts and to communicate this information to another child. They were also asked a number of inferential questions about the topics. The children in the analogy condition recalled and communicated more of the information contained in the texts and were more likely to remember the content units shared by the analogous concepts than were the children in the no-analogy condition. This effect was stronger for the older children than for the younger children. Although the children made a number of erroneous inferences about the topic, these inferences were not related to the presence of the analogies. These results show that analogies can help children acquire information from expository text, presumably because they make it possible for the children to transfer an explanatory structure from a familiar domain to an unfamiliar one. (PsycINFO Database Record (c) 2010 APA, all rights reserved)