scholarly journals Display repetitions do not improve search efficiency in parallel search tasks.

2018 ◽  
Vol 18 (10) ◽  
pp. 524
Author(s):  
Gavin Ng ◽  
Simona Buetti ◽  
Alejandro Lleras
Keyword(s):  
Parallel Search ◽  
Search Efficiency ◽  
Search Tasks

scholarly journals Can search result summaries enhance the web search efficiency and experiences of the visually impaired users?

2020 ◽  
Author(s):  
Aboubakr Aqle ◽  
Dena Al-Thani ◽  
Ali Jaoua
Keyword(s):  
Search Engine ◽  
Visually Impaired ◽  
Web Search ◽  
Task Completion ◽  
Formal Concept ◽  
Search Efficiency ◽  
User Interactions ◽  
Search Results ◽  
Search Tasks ◽  
Google Search

AbstractThere are limited studies that are addressing the challenges of visually impaired (VI) users when viewing search results on a search engine interface by using a screen reader. This study investigates the effect of providing an overview of search results to VI users. We present a novel interactive search engine interface called InteractSE to support VI users during the results exploration stage in order to improve their interactive experience and web search efficiency. An overview of the search results is generated using an unsupervised machine learning approach to present the discovered concepts via a formal concept analysis that is domain-independent. These concepts are arranged in a multi-level tree following a hierarchical order and covering all retrieved documents that share maximal features. The InteractSE interface was evaluated by 16 legally blind users and compared with the Google search engine interface for complex search tasks. The evaluation results were obtained based on both quantitative (as task completion time) and qualitative (as participants’ feedback) measures. These results are promising and indicate that InteractSE enhances the search efficiency and consequently advances user experience. Our observations and analysis of the user interactions and feedback yielded design suggestions to support VI users when exploring and interacting with search results.

Distractor rejection in parallel search tasks takes time but does not benefit from context repetition

2019 ◽  
Vol 27 (5-8) ◽  
pp. 609-625 ◽  
Author(s):  
Gavin Jun Peng Ng ◽  
Simona Buetti ◽  
Sanda Dolcos ◽  
Florin Dolcos ◽  
Alejandro Lleras
Keyword(s):  
Parallel Search ◽  
Search Tasks ◽  
Distractor Rejection

Measuring search efficiency in complex visual search tasks: Global and local clutter.

2010 ◽  
Vol 16 (3) ◽  
pp. 238-250 ◽  
Author(s):  
Melissa R. Beck ◽  
Maura C. Lohrenz ◽  
J. Gregory Trafton
Keyword(s):  
Visual Search ◽  
Search Efficiency ◽  
Search Tasks ◽  
Global And Local

Menu Organization and User Expertise in Information Search Tasks

1987 ◽  
Vol 29 (5) ◽  
pp. 577-586 ◽  
Author(s):  
J. G. Hollands ◽  
Philip M. Merikle
Keyword(s):  
Information Search ◽  
Subject Area ◽  
Matching Task ◽  
Search Efficiency ◽  
Subject Domain ◽  
Search Tasks ◽  
User Expertise ◽  
Scaling Procedure ◽  
The Subject ◽  
Different Levels

A categorical menu structure based on experts' semantic memory organization was developed, and search efficiency using this menu organization, relative to search efficiency using alphabetic and random menu organizations, was evaluated for users with different levels of expertise. In Experiment 1 experts in psychology sorted 120 psychological terms and the data were submitted to a multidimensional scaling procedure to identify the clusters of terms used to develop the categorical menu organization. In Experiment 2 search efficiency with the three different menu organizations was evaluated for users with different levels of expertise in the subject domain on two different search tasks: (1) definition matching, wherein given a definition, it was necessary to find the correct term with its definition; and (2) term matching, wherein given a term, it was necessary to find the identical term with its definition. Performance on both search tasks improved directly with expertise in the subject area when the categorical menu organization was used, and experts completed the definition-matching task faster than novices with all three types of menu organization. However, performance on the term-matching task was not influenced by expertise when alphabetic and random menu organizations were used.

scholarly journals Centre-of-Gravity Fixations in Visual Search: When Looking at Nothing Helps to Find Something

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Dustin Venini ◽  
Roger W. Remington ◽  
Gernot Horstmann ◽  
Stefanie I. Becker
Keyword(s):  
Visual Search ◽  
Information Gain ◽  
Higher Order ◽  
Search Efficiency ◽  
Centre Of Gravity ◽  
Search Tasks ◽  
Multiple Item ◽  
Efficient Processing ◽  
Abstract Stimuli

In visual search, some fixations are made between stimuli on empty regions, commonly referred to as “centre-of-gravity” fixations (henceforth: COG fixations). Previous studies have shown that observers with task expertise show more COG fixations than novices. This led to the view that COG fixations reflect simultaneous encoding of multiple stimuli, allowing more efficient processing of task-related items. The present study tested whether COG fixations also aid performance in visual search tasks with unfamiliar and abstract stimuli. Moreover, to provide evidence for the multiple-item processing view, we analysed the effects of COG fixations on the number and dwell times of stimulus fixations. The results showed that (1) search efficiency increased with increasing COG fixations even in search for unfamiliar stimuli and in the absence of special higher-order skills, (2) COG fixations reliably reduced the number of stimulus fixations and their dwell times, indicating processing of multiple distractors, and (3) the proportion of COG fixations was dynamically adapted to potential information gain of COG locations. A second experiment showed that COG fixations are diminished when stimulus positions unpredictably vary across trials. Together, the results support the multiple-item processing view, which has important implications for current theories of visual search.

scholarly journals Beyond Looking for the Rewarded Target: The Effects of Reward on Attention in Search Tasks

2021 ◽  
Vol 12 ◽  
Author(s):  
Annabelle Walle ◽  
Michel D. Druey
Keyword(s):  
Response Time ◽  
Time Pressure ◽  
Search Time ◽  
Search Efficiency ◽  
Attentional Processing ◽  
Search Tasks ◽  
Performance Effects ◽  
Underlying Mechanisms ◽  
Response Time Distributions

One puzzling result in training-test paradigms is that effects of reward-associated stimuli on attention are often seen in test but not in training. We focus on one study, where reward-related performance benefits occur in the training and which was discussed contentiously. By using a similar design, we conceptually replicated the results. Moreover, we investigated the underlying mechanisms and processes resulting in these reward-related performance benefits. In two experiments, using search tasks and having participants perform the tasks either with or without individually adjusted time pressure, we disentangled the mechanisms and processes contributing to the reward-related benefits. We found evidence that not only search efficiency is increased with increasing reward, but also that non-search factors contribute to the results. By also investigating response time distributions, we were able to show that reward-related performance effects increased as search time increased in demanding tasks but not in less demanding tasks. Theoretical implications of the results regarding how reward influences attentional processing are discussed.

scholarly journals Search efficiency in parallel search is not impacted (or only minimally so) by background complexity.

2021 ◽  
Vol 21 (9) ◽  
pp. 2458
Author(s):  
Yaoyun Cui ◽  
Gavin J.P. Ng ◽  
Alejandro Lleras ◽  
Simona Buetti
Keyword(s):  
Parallel Search ◽  
Search Efficiency
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