Preparation Time and Response Complexity Effects on Stutterers’ and Nonstutterers’ Acoustic LRT

1991 ◽  
Vol 34 (1) ◽  
pp. 49-59 ◽  
Author(s):  
James Dembowski ◽  
Ben C. Watson
Keyword(s):  
Stimulus Condition ◽  
Reaction Times ◽  
Group Differences ◽  
Response Type ◽  
Response Preparation ◽  
Preparation Time ◽  
Stimulus Response ◽  
The Difference ◽  
Motor Initiation ◽  
Do So

Nonstutterers’, mild stutterers’, and severe stutterers’ acoustic laryngeal reaction times (LRTs) were recorded for isolated vowels and nonpropositional VCV responses in different stimulus conditions governing response preparation. In all stimulus-response conditions severe stutterers produced the longest LRTs, followed in turn by mild stutterers and nonstutterers. The three groups significantly differed from one another in most conditions, but the magnitude of difference between mild and severe stutterers was notably greater than the difference between mild stutterers and nonstutterers. LRT changes as a function of stimulus condition showed that, in general, nonstutterers were best able to use a preparation-facilitating stimulus condition to reduce LRT, and severe stutterers least able to do so. LRT changes as a function of response complexity showed that only nonstutterers produced statistically significant within-group differences. Patterns of LRT change as a combined function of group, stimulus condition, and response type suggest a complex relationship between stutterer severity, preparation time, and type of response complexity. Results illustrate aspects of Goldberg’s (1985) model of preparation processes, and support hypotheses that stutterer subgroups show differential preparation deficits along with high motor initiation variability.

The Role of Feedback in Learning Spatially Incompatible Choice Reaction Tasks: Does it Have one?

1993 ◽  
Vol 37 (19) ◽  
pp. 1320-1324
Author(s):  
Addie Dutta ◽  
Robert W. Proctor
Keyword(s):  
Compatibility Effect ◽  
Reaction Times ◽  
Response Compatibility ◽  
Stimulus Response ◽  
Response Deadline ◽  
Extended Practice ◽  
Stimulus Response Compatibility ◽  
The Difference ◽  
Speed Accuracy

Stimulus-response compatibility effects have been shown to persist even after extended practice. In the present study, two experiments were conducted to see if the effects persist when knowledge of results that allows subjects to set performance goals is provided. In the first experiment, summary feedback about mean accuracy and mean reaction time was provided after each block of 40 trials of practice in a two-choice spatial compatibility task. Subjects practiced the task for 2,400 trials, yet the compatibility effect was not eliminated. Compared to previous experiments, reaction times were faster overall, but the degree of change was the same for both compatible and incompatible assignments. In the second experiment, a response deadline was imposed on each trial. If the subject did not respond within the time limit, which was reduced as the experiment progressed, auditory feedback was presented. Summary feedback was also presented as in Experiment 1. Again, 2,400 trials of practice reduced but did not eliminate the compatibility effect. The greater reduction in the difference in reaction times for compatible and incompatible assignments, relative to other experiments, could be attributed to speed-accuracy tradeoff. The results indicate that the persistence of stimulus-response compatibility effects with extended practice is not due to poorer motivation to perform with the incompatible assignment. The results suggest that training will be insufficient to overcome difficulties in performance resulting from spatially incompatible assignments.

Effects of Context in Simple Stimulus Identification: Reading-Related Differences

1984 ◽  
Vol 59 (1) ◽  
pp. 71-76
Author(s):  
Karen B. Nicholas ◽  
Enrique Acosta
Keyword(s):  
Prediction Accuracy ◽  
Context Effects ◽  
Fourth Graders ◽  
Reaction Times ◽  
Error Rates ◽  
Group Differences ◽  
Skilled Readers ◽  
Random Occurrence ◽  
The Difference ◽  
Stimulus Identification

Highly skilled, skilled, and less-skilled third and fourth graders ( N = 30) predicted the random occurrence of left or right arrows. For all subjects, reaction times (RTs) to correctly predicted events were faster than RTs to incorrectly predicted events. However, the difference in RT between correctly and incorrectly predicted events was larger for the less-skilled readers than for the other subjects. No other group differences, e.g., error rates or prediction accuracy, were found. The results extend a basic finding in the adult literature to younger subjects and suggest that reading-related differences in context effects may be related to differences in basic processing rather than specific difficulties in processing linguistic information.

scholarly journals Dissociable Roles for Working Memory in Sensorimotor Learning

2018 ◽  
Author(s):  
Samuel D. McDougle ◽  
Jordan A. Taylor
Keyword(s):  
Working Memory ◽  
Time Pressure ◽  
Cognitive Strategies ◽  
Reaction Times ◽  
Specific Model ◽  
Sensorimotor Learning ◽  
Preparation Time ◽  
Stimulus Response ◽  
Discrete Response ◽  
Memory Representations

ABSTRACTThe computations underlying cognitive strategies in sensorimotor learning are poorly understood. Here we investigate such strategies in a sensorimotor transformation task. We show that strategies assume two forms, reflecting distinct working memory representations: discrete response caching of stimulus-response contingencies (e.g., look-up table; RC), and time-consuming parametric computations (e.g. mental rotation; MR). Subjects’ reaction times and errors suggest that both strategies are employed during learning, and trade off based on the progress of learning and the complexity of the task. Experiments using pressured preparation time support these working memory mechanisms: In discrete RC, time pressure elicits bimodal distributions of movements, in agreement with cached responses; in parametric MR, time pressure elicits a shifting distribution producing intermediate movements between visual targets and distal goals, consistent with analog re-computing of a movement plan. These results provide a specific model of working memory contributions to motor learning.

Adjectives and their keyness: a corpus-based analysis of tourism discourse in English

Corpora ◽  
2019 ◽  
Vol 14 (3) ◽  
pp. 351-378 ◽  
Author(s):  
Isabel Durán-Muñoz
Keyword(s):  
Domain Specific ◽  
Adventure Tourism ◽  
Frequency Of Use ◽  
Relevant Reference ◽  
The Difference ◽  
Do So

This paper attempts to shed some light on the importance of adjectives in the linguistic characterisation of tourism discourse in English in general and in adventure tourism in particular as well as to prove how significant the difference in usage is compared to the general language. It seeks to understand the role that adjectives play in this specific subdomain and to contribute to the linguistic characterisation of tourism discourse in this respect. It also aims to confirm or reject previous assumptions regarding the use, and frequency of use, of adjectives and adjectival patterns in this specialised domain and, in general, to promote the study of adjectivisation in domain-specific discourses. To do so, it proposes a corpus-based study that measures the keyness of adjectives in promotional texts of the adventure tourism domain in English by comparing their usage in the compiled corpus to the two most relevant reference corpora of English (coca and the bnc).

scholarly journals A Secular Critique of Religious Ethics and Politics

2017 ◽  
Author(s):  
Paul Cliteur
Keyword(s):  
Extreme Case ◽  
Moral Autonomy ◽  
Religious Ethics ◽  
Religious Leader ◽  
Political Autonomy ◽  
Central Notion ◽  
The Difference ◽  
Do So ◽  
The Ideal ◽  
Ethics And Politics

This chapter discusses the difference between a nonsecular or religious critique of religious ethics and politics and a specifically secular critique. It introduces the central notion of a secular critique, autonomy, and its two types, moral and political. Moral autonomy entails the separation of religion from ethics. The ideal of making that separation is called “moral secularism.” The opposite of moral autonomy is “moral heteronomy.” An extreme case of moral heteronomy is discussed: Abraham’s willingness to sacrifice his own son when God commanded him to do so. Next, the importance of political autonomy and political secularism is illustrated with reference to the conflict between the king Ahab (the model of a secular ruler) and the prophet Elijah (the model of a religious leader). Some stories in the holy scriptures of the monotheist religions held in common by Judaism, Christianity, and Islam are unfavorable toward secularism (both moral and political).

Effect of Bilingualism on Multitasking: A Pilot Study

2015 ◽  
Vol 22 (3) ◽  
pp. 94-101 ◽  
Author(s):  
Li Hsieh
Keyword(s):  
Executive Control ◽  
Positive Impact ◽  
Reaction Times ◽  
Language Experience ◽  
Bilingual Advantage ◽  
Bilingual Speakers ◽  
Proficiency Level ◽  
Linguistic Representations ◽  
A Cell ◽  
The Difference

Bilingual speakers rely on attentional and executive control to continuously inhibit or activate linguistic representations of competing languages, which leads to an increased efficiency known as “bilingual advantage”. Both monolingual and bilingual speakers were asked to perform multiple tasks of talking on a cell phone while simultaneously attending to simulated driving events. This study examined the effect of bilingualism on participants' performance during a dual-task experiment based on 20 monolingual and 13 bilingual healthy adults. The within-subject and between-subject comparisons were conducted on reaction times of a visual event detection task for (a) only driving and (b) driving while simultaneously engaged in a phone conversation. Results of this study showed that bilingual speakers performed significantly faster than monolingual speakers during the multitasking condition, but not during the driving only condition. Further, bilingual speakers consistently showed a bilingual advantage in reaction times during the multitasking condition, despite varying degrees on a bilingual dominance scale. Overall, experiences in more than one language yield bilingual advantage in better performance than monolingual speakers during a multitasking condition, but not during a single task condition. Regardless of the difference in bilingual proficiency level, such language experience reveals a positive impact on bilingual speakers for multitasking.

Rule Fitness and Pathology in Learning Classifier Systems

2004 ◽  
Vol 12 (1) ◽  
pp. 99-135 ◽  
Author(s):  
Tim Kovacs
Keyword(s):  
Value Functions ◽  
Classifier Systems ◽  
Reward Function ◽  
Learning Classifier ◽  
Learning Tasks ◽  
General Rules ◽  
Strength Based ◽  
The Difference ◽  
The Value Function ◽  
Do So

It has long been known that in some relatively simple reinforcement learning tasks traditional strength-based classifier systems will adapt poorly and show poor generalisation. In contrast, the more recent accuracy-based XCS, appears both to adapt and generalise well. In this work, we attribute the difference to what we call strong over general and fit over general rules. We begin by developing a taxonomy of rule types and considering the conditions under which they may occur. In order to do so an extreme simplification of the classifier system is made, which forces us toward qualitative rather than quantitative analysis. We begin with the basics, considering definitions for correct and incorrect actions, and then correct, incorrect, and overgeneral rules for both strength and accuracy-based fitness. The concept of strong overgeneral rules, which we claim are the Achilles' heel of strength-based classifier systems, are then analysed. It is shown that strong overgenerals depend on what we call biases in the reward function (or, in sequential tasks, the value function). We distinguish between strong and fit overgeneral rules, and show that although strong overgenerals are fit in a strength-based system called SB-XCS, they are not in XCS. Next we show how to design fit overgeneral rules for XCS (but not SB-XCS), by introducing biases in the variance of the reward function, and thus that each system has its own weakness. Finally, we give some consideration to the prevalence of reward and variance function bias, and note that non-trivial sequential tasks have highly biased value functions.

Pure and Applied Research in Linguistics: Is the Difference Merely One of Motivation?

1979 ◽  
Vol 1 (2) ◽  
pp. 77-90 ◽  
Author(s):  
S.P. Corder
Keyword(s):  
Personal Identity ◽  
Applied Research ◽  
Applied Linguistics ◽  
Early Years ◽  
Academic World ◽  
The Social ◽  
Learned Societies ◽  
The Difference ◽  
Own Name ◽  
Do So

It is perhaps natural that in the early years of emergence of a new field of study and research its practitioners should from time to time ask themselves what is the nature of the activity they are engaged in. The need to do so may stem from a number of different causes: philosophical, sociological and psychological. The practitioners may feel the need to establish a personal identity, that is, some accepted place for themselves in the social structure of the academic world, to achieve respect and recognition as workers in the field of scholarship, a role in the institution of higher studies. They may feel that the discipline they profess is not properly recognised within the scholarly domain, its place not clearly determined in the structure of science or scholarship, its value to society not appreciated; and that consequently it does not attract research funds in its own name, permit the establishment of courses and programmes which lead to academic degrees or qualifications bearing its name, or of learned societies devoted to discussing its problems and disseminating its notions. All of these factors I believe play a part in the motivations for the constantly renewed discussion of WHAT IS APPLIED LINGUISTICS? None of them is in any way reprehensible or unworthy. The intensity or frequency with which these discussions occur is a response to the prevailing orthodox views about the discipline itself and its relation to neighbouring disciplines found in the society where the discussions take place, and to the degree to which its practitioners (i.e. people who call themselves applied linguists) feel oppressed, unrecognised or undervalued by the members of the institution in which they work and with whom they interact. This is a whole field of investigation open to the sociologist of science to describe and explain.

scholarly journals Attention and the motion after effect: New measurements with visual search reveal important individual differences in adaptability

2018 ◽  
Author(s):  
Michael J. Morgan ◽  
Joshua A. Solomon
Keyword(s):  
Reaction Times ◽  
Visual Pathway ◽  
Human Vision ◽  
The Other ◽  
Test Array ◽  
Mouse Click ◽  
Search Speed ◽  
After Effect ◽  
The One ◽  
Do So

AbstractIt is usually assumed that sensory adaptation is a universal property of human vision. However, in two experiments designed to measure adaptation without bias, we have discovered a minority of participants who were unusual in the extent of their adaptation to motion. One experiment was designed so that targets would be invisible without adaptation; the other, so that adaptation would interfere with target detection. In the first, participants adapted to a spatial array of moving Gabor patches. On each trial the adapting array was followed by a test array in which but all of the test patches except one were identical to their spatially corresponding adaptors; the target moved in the opposite direction to its adaptor. Participants were required to identify the location of the changed target with a mouse click. The ability to do so increased with the number of adapting trials. Neither search speed nor accuracy was affected by an attentionally-demanding conjunction task at the fixation point during adaptation, suggesting low-level (pre-attentive) sites in the visual pathway for the adaptation. However, a minority of participants found the task virtually impossible. In the second experiment the same participants were required to identify the one element in the test array that was slowly moving: reaction times in this case were elevated following adaptation. The putatively weak adapters from the first experiment found this task easier than the strong adapters.

scholarly journals Comparison of organics and heavy metals acute toxicities to Vibrio fischeri

2016 ◽  
Vol 81 (6) ◽  
pp. 697-705 ◽  
Author(s):  
Xuepeng Yang ◽  
Yan Ji ◽  
Fangfang Wang ◽  
Jia Xu ◽  
Xiangzhen Liu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Cell Death ◽  
Benzoic Acid ◽  
Death Rate ◽  
Vibrio Fischeri ◽  
Reaction Times ◽  
Inhibition Rate ◽  
Cell Death Rate ◽  
Bioluminescence Inhibition ◽  
The Difference

Vibrio fischeri bioluminescence inhibition has been widely used to test acute toxicities of metals and organics contaminants. However, the differences of metals and organics acute toxicities to V. fischeri have not been compared. Here, four heavy metals (Zn2+, Cu2+, Cd2+, Cr6+) and five organics (phenol, benzoic acid, p-hydroxy benzoic acid, nitro-benzene and benzene) acute toxicities to V. fischeri were investigated. Heavy metals toxicities to V. fischeri were increased along with the reaction time, while the organics toxicities kept the same level in different reaction times. In order to explain the difference, the relative cell death rate of V. fischeri was detected. In metals toxicities tests, the bioluminescence inhibition rate of V. fischeri was found to be significantly higher than the relative cell death rate (P<0.05), while for the organics toxicities tests, the cell death rate was similar to the bioluminescence inhibition rate. These results indicated that organics acute toxicities to V. fischeri could reflect the death of cell, but metals acute toxicities to V. fischeri may not lead to the death of cell, just represent the bioluminescence inhibition.

Sign in / Sign up

Export Citation Format

Share Document