SwePub
Sök i SwePub databas

  Utökad sökning

Träfflista för sökning "WFRF:(Johansson Kenneth) ;conttype:(refereed);pers:(Holmqvist Kenneth);pers:(Johansson Roger)"

Sökning: WFRF:(Johansson Kenneth) > Refereegranskat > Holmqvist Kenneth > Johansson Roger

  • Resultat 1-10 av 26
Sortera/gruppera träfflistan
   
NumreringReferensOmslagsbildHitta
1.
2.
  • Johansson, Roger, et al. (författare)
  • Eye movements play an active role when visuospatial information is recalled from memory
  • 2012
  • Ingår i: Journal of Vision. ; 12:9
  • Konferensbidrag (refereegranskat)abstract
    • Abstract in Undetermined Whilst it has been established that spontaneous eye movements occur with visual imagery and that they are comparable with those from an original scene inspection (e.g., Brandt & Stark, 1997; Johansson, Holsanova, & Holmqvist, 2006), the exact purpose of these eye movements has been a hot topic of debate (cf., Ferreira et al., 2008; Richardson et al., 2009). Do they have an active and functional role in memory retrieval or are they merely an epiphenomenon? In a recent study we reported that when eye movements were prohibited for participants who orally described pictures from memory, their recollections became altered and impaired (Johansson, Holsanova, Dewhurst, & Holmqvist, (in press). Journal of Experimental Psychology: Human Perception and Performance). The current study was designed as a follow-up, aiming to uncover exactly how imposing different eye movements on participants affects memory retrieval processes. Eye movements were recorded from participants who recalled properties and spatial arrangements of sets of objects under four different manipulations: (1) free viewing on a blank screen; (2) gazing at a fixation cross; (3) looking at an area which was matched with the original locations of the objects to be recalled; (4) looking at an area which did not match the original locations of the objects to be recalled. By restricting eye movements in different ways during recall, we demonstrate the sensitivity of retrieval performance to specific eye movement manipulations. Results provide evidence that eye movements do have an active and supportive role when visuospatial information is recalled by highlighting the circumstances under which a visual memory is hampered. Additionally, findings suggest that the influence of "eye movements to nothing" is primarily related to the processing and retrieval of spatial information.
3.
  • Johansson, Roger, et al. (författare)
  • Eye movements to “nothing” have an active role when arrangements of objects are retrieved from memory
  • 2012
  • Konferensbidrag (refereegranskat)abstract
    • Several studies have reported that spontaneous eye movements occur with visual imagery and that they closely reflect content and spatial relations from an original picture or scene (e.g., Brandt & Stark, 1997; Spivey & Geng, 2001; Johansson, Holsanova, & Holmqvist, 2006). Nevertheless, the exact purpose of these eye movements to “nothing” is elusive and has currently been the target of a hot topic of debate (cf., Ferreira et al., 2008; Richardson et al., 2009). Do they have an active and functional role when visuospatial memories are retrieved or are they merely an epiphenomenon? In a recent study we reported that when eye movements were prohibited for participants who orally described pictures from memory, their recollections became altered and impaired (Johansson, Holsanova, Dewhurst, & Holmqvist, 2011). The current study was designed as a follow-up, with the purpose to uncover exactly how imposing different eye movements on participants affect memory retrieval of visuospatial memories. Eye movements were recorded – using a SMI RED 500-system – from 16 participants during an experiment where sets of objects were visually encoded and subsequently retrieved from memory. In the encoding phase, the participants encoded 24 objects in different locations on a computer screen. In the retrieval phase, they listened to pre-recorded spoken statements that either dealt with a property of an object – intra-object – or with the spatial arrangement between two objects – inter-object. The participants were instructed to orally decide whether those statements were true (by saying ‘yes’) or false (by saying ‘no’). The retrieval phase was divided into blocks of four different conditions: (1) free viewing on a blank screen; (2) gazing at a fixation cross; (3) looking at an area which was matched with the original location of the object(s) to be recalled; (4) looking at an area which did not match the original location of the object(s) to be recalled. Over the entire experiment each participant responded to 192 statements. The data was analyzed within-subjects over the four conditions in respect to reaction time (RT) for correct responses. The eye movement data was used to verify if the participants were able to comply in the conditions when they were restricted to look at the fixation cross or inside the matched/non-matched area. If not, those trials were excluded. Results revealed a significant main effect for RT in regard to inter-object statements but not for intra-object statements. Post-hoc comparisons revealed that looking at the fixation cross and looking at the area which did not match the original location of the objects to be retrieved yielded significantly longer RT when compared to free viewing and looking at the area which matched the original location of the objects to be retrieved. Consequently, these results demonstrate that eye movements to “nothing” do indeed have an active and supportive role when visuospatial information is retrieved from memory and show that those eye movements primarily influence processes that integrate spatial properties between objects.
  •  
4.
  • Johansson, Roger, et al. (författare)
  • Looking at the keyboard or the monitor: relationship with text production processes
  • 2010
  • Ingår i: Reading and Writing. - Springer. - 0922-4777. ; 23:7, s. 835-851
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper we explored text production differences in an expository text production task between writers who looked mainly at the keyboard and writers who looked mainly at the monitor. Eye-tracking technology and keystroke-logging were combined to systematically describe and define these two groups in respect of the complex interplay between text production and the reading of one's own emerging text. Findings showed that monitor gazers typed significantly faster and were more productive writers. They also read their own text more, and they frequently read in parallel with writing. Analysis of fixation durations suggests that more cognitive processing is in use during reading in parallel with writing than during reading in pauses. Keyboard gazers used the left and right cursor keys significantly more. We suggest that this is because they revised their texts in a much more serial mode than monitor gazers. Finally, analysis of the characteristics of the final texts showed no differences between the groups.
  •  
5.
  • Johansson, Roger, et al. (författare)
  • Reading During Text Production
  • 2012
  • Ingår i: Learning to Write Effectively: Current Trends in European Research, Studies in Writing / editors: Mark Torrance, Denis Alamargot, Montserrat Castelló, Franck Ganier, Otto Kruse, Anne Mangen, Liliana Tolchinsky and Luuk van Waes. - Bingley, UK : Emerald. - 978-17-80-52928-8 ; s. 359-361
  • Bokkapitel (refereegranskat)
  •  
6.
  •  
7.
  • Wengelin, Åsa, et al. (författare)
  • Combined eyetracking and keystroke-logging methods for studying cognitive processes in text production.
  • 2009
  • Ingår i: Behavior Research Methods. - The Psychonomic Society. - 1554-351X. ; 41:2, s. 337-351
  • Tidskriftsartikel (refereegranskat)abstract
    • Writers typically spend a certain proportion of time looking back over the text that they have written. This is likely to serve a number of different functions, which are currently poorly understood. In this article, we present two systems, ScriptLog+ TimeLine and EyeWrite, that adopt different and complementary approaches to exploring this activity by collecting and analyzing combined eye movement and keystroke data from writers composing extended texts. ScriptLog+ TimeLine is a system that is based on an existing keystroke-logging program and uses heuristic, pattern-matching methods to identify reading episodes within eye movement data. EyeWrite is an integrated editor and analysis system that permits identification of the words that the writer fixates and their location within the developing text. We demonstrate how the methods instantiated within these systems can be used to make sense of the large amount of data generated by eyetracking and keystroke logging in order to inform understanding of the cognitive processes that underlie written text production.
  •  
8.
  • Dewhurst, Richard, et al. (författare)
  • It depends on how you look at it: Scanpath comparison in multiple dimensions with MultiMatch, a vector-based approach
  • 2012
  • Ingår i: Behavior Research Methods. - The Psychonomic Society. - 1554-351X.
  • Tidskriftsartikel (refereegranskat)abstract
    • Eye movement sequences---or scanpaths---vary depending on stimulus characteristics and task (Foulsham \& Underwood, 2008; Land, Mennie, \& Rusted, 1999). Common methods for comparing scanpaths, however, are limited in their ability to capture both the spatial and temporal properties of which a scanpath consists. Here we validate a new method for scanpath comparison based on geometric vectors, which compares scanpaths over multiple dimensions retaining positional and sequential information (Jarodzka, Holmqvist, \& Nyström, 2010). `MultiMatch' was tested in two experiments and pitted against ScanMatch (Cristino, Mathôt, Theeuwes, \& Gilchrist, 2010), the most comprehensive adaptation of the popular Levenshtein method. Experiment 1 used synthetic data, demonstrating the greater sensitivity of MultiMatch to variations in spatial position. In experiment 2 real eye movement recordings were taken from participants viewing sequences of dots, designed to elicit scanpath pairs with commonalities known to be problematic for algorithms (for example, when one scanpath is shifted in locus, or fixations fall either side of an AOI boundary). Results illustrate the advantages of a multidimensional approach, revealing how two scanpath differ. For instance, if one scanpath is the reverse copy of another the difference is in direction but not the position of fixations; or if a scanpath is scaled down, the difference is in the length of saccadic vectors but not overall shape. As well as having enormous potential for any task in which consistency in eye movements is important (e.g. learning), MultiMatch is particularly relevant for "eye movements to nothing" in mental imagery research and embodiment of cognition, where satisfactory scanpath comparison algorithms are lacking.
9.
10.
  • Foulsham, Thomas, et al. (författare)
  • Comparing scanpaths during scene encoding and recognition: A multi-dimensional approach
  • 2012
  • Ingår i: Journal of Eye Movement Research. - European Group for Eye Movement Research. - 1995-8692. ; 5:4:3, s. 1-14
  • Tidskriftsartikel (refereegranskat)abstract
    • Abstract in Undetermined Complex stimuli and tasks elicit particular eye movement sequences. Previous research has focused on comparing between these scanpaths, particularly in memory and imagery research where it has been proposed that observers reproduce their eye movements when recognizing or imagining a stimulus. However, it is not clear whether scanpath similarity is related to memory performance and which particular aspects of the eye movements recur. We therefore compared eye movements in a picture memory task, using a recently proposed comparison method, MultiMatch, which quantifies scanpath similarity across multiple dimensions including shape and fixation duration. Scanpaths were more similar when the same participant's eye movements were compared from two viewings of the same image than between different images or different participants viewing the same image. In addition, fixation durations were similar within a participant and this similarity was associated with memory performance.
Skapa referenser, mejla, bekava och länka
  • Resultat 1-10 av 26
 
pil uppåt Stäng

Kopiera och spara länken för att återkomma till aktuell vy