SENSATION and PERCEPTION an Integrated Approach
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Saccadic Eye Movements and Perceptual Judgments Reveal a Shared Visual Representation That Is Increasingly Accurate Over Time ⇑ Wieske Van Zoest A, , Amelia R
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Elsevier - Publisher Connector Vision Research 51 (2011) 111–119 Contents lists available at ScienceDirect Vision Research journal homepage: www.elsevier.com/locate/visres Saccadic eye movements and perceptual judgments reveal a shared visual representation that is increasingly accurate over time ⇑ Wieske van Zoest a, , Amelia R. Hunt b a Cognitive Psychology, Vrije Universiteit Amsterdam, van der Boechorststraat 1, 1081 BT, Amsterdam, The Netherlands b School of Psychology, University of Aberdeen, Aberdeen AB24 2UB, UK article info abstract Article history: Although there is evidence to suggest visual illusions affect perceptual judgments more than actions, Received 7 July 2010 many studies have failed to detect task-dependant dissociations. In two experiments we attempt to Received in revised form 22 September 2010 resolve the contradiction by exploring the time-course of visual illusion effects on both saccadic eye movements and perceptual judgments, using the Judd illusion. The results showed that, regardless of whether a saccadic response or a perceptual judgement was made, the illusory bias was larger when Keywords: responses were based on less information, that is, when saccadic latencies were short, or display duration Perception and action was brief. The time-course of the effect was similar for both the saccadic responses and perceptual judge- Visual illusions ments, suggesting that both modes may be driven by a shared visual representation. Changes in the Saccadic eye movements Time-course of processing strength of the illusion over time also highlight the importance of controlling for the latency of different response systems when evaluating possible dissociations between them. -
The Role of Motion Streaks in the Perception of the Kinetic Zollner Illusion
Journal of Vision (2012) 12(6):19, 1–14 http://www.journalofvision.org/content/12/6/19 1 The role of motion streaks in the perception of the kinetic Zollner illusion The School of Optometry and Vision Science, The University of New South Wales, Sieu K. Khuu Sydney, New South Wales $ In classic geometric illusions such as the Zollner illusion, vertical lines superimposed on oriented background lines appear tilted in the direction opposite to the background. In kinetic forms of this illusion, an object moving over oriented background lines appears to follow a titled path, again in the direction opposite to the background. Existing literature does not proffer a complete explanation of the effect. Here, it is suggested that motion streaks underpin the illusion; that the effect is a consequence of interactions between detectors tuned to the orientation of background lines and those sensing the motion streaks that arise from fast object motion. This account was examined in the present study by measuring motion-tilt induction under different conditions in which the strength or salience of motion streaks was attenuated: by varying object speed (Experiment 1), contrast (Experiment 2), and trajectory/length by changing the element life-time within the stimulus (Experiment 3). It was predicted that, as motion streaks become less available, background lines would less affect the perceived direction of motion. Consistent with this prediction, the results indicated that, with a reduction in object speed below that required to generate motion streaks (, 1.128/s), Weber contrast (, 0.125) and motion streak length (two frames) reduced or extinguished the motion-tilt-induction effect. -
Geometrical Optical Illusion Via Sub-Riemannian Geodesics in the Roto-Translation Group
Geometrical Optical Illusion via Sub-Riemannian Geodesics in the Roto-Translation Group B. Franceschiello1, A. Mashtakov2, G. Citti3, and A. Sarti4 1 Fondation Asile des Aveugles and Laboratory for Investigative Neurophisiology, Department of Radiology, CHUV - UNIL, Lausanne 2 Program Systems Institute of RAS, Russia, CPRC, 3 Department of Mathematics, University of Bologna, Italy 4 CAMS, Center of Mathematics, CNRS - EHESS,Paris, France [email protected], [email protected], [email protected], [email protected] Abstract. We present a neuro-mathematical model for geometrical op- tical illusions (GOIs), a class of illusory phenomena that consists in a mismatch of geometrical properties of the visual stimulus and its associ- ated percept. They take place in the visual areas V1/V2 whose functional architecture have been modelled in previous works by Citti and Sarti as a Lie group equipped with a sub-Riemannian (SR) metric. Here we ex- tend their model proposing that the metric responsible for the cortical connectivity is modulated by the modelled neuro-physiological response of simple cells to the visual stimulus, hence providing a more biologically plausible model that takes into account a presence of visual stimulus. Il- lusory contours in our model are described as geodesics in the new metric. The model is confirmed by numerical simulations, where we compute the geodesics via SR-Fast Marching. 1 Introduction Geometrical-optical illusions (GOIs) have been discovered in the XIX century by German psychologists (Oppel 1854 [50], Hering, 1878,[33]) and have been defined as situations in which there is an awareness of a mismatch of geometrical prop- erties between an item in the object space and its associated percept [68]. -
A Test of an Auditory Motion Hypothesis for Continuous and Discrete Sounds Moving in Pitch Space
A TEST OF AN AUDITORY MOTION HYPOTHESIS FOR CONTINUOUS AND DISCRETE SOUNDS MOVING IN PITCH SPACE Molly J. Henry A Dissertation Submitted to the Graduate College of Bowling Green State University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY May 2011 Committee: J. Devin McAuley, Advisor Rodney M. Gabel Graduate Faculty Representative Jennifer Z. Gillespie Dale S. Klopfer ii ABSTRACT J. Devin McAuley, Advisor Ten experiments tested an auditory motion hypothesis, which proposes that regular pitch- time trajectories facilitate perception of and attention to auditory stimuli; on this view, listeners are assumed to use velocity information (pitch change per unit time) to generate expectations about the future time course of continuous and discrete sounds moving in pitch space. Toward this end, two sets of experiments were conducted. In six experiments reported in Part I of this dissertation, listeners judged the duration or pitch change of a continuous or discrete comparison stimulus relative to a standard, where the comparison’s velocity varied on each trial relative to the fixed standard velocity. Results indicate that expectations generated based on velocity information led to distortions in perceived duration and pitch change of continuous stimuli that were consistent with the auditory motion hypothesis; specifically, when comparison velocity was relatively fast, duration was overestimated and pitch change was underestimated. Moreover, when comparison velocity was relatively slow, duration was underestimated and pitch change was overestimated. On the other hand, no perceptual distortions were observed for discrete stimuli, consistent with the idea that velocity information is less clearly conveyed, or easier to ignore, for discrete auditory stimuli. -
Computational Role of Disinhibition in Brain Function
COMPUTATIONAL ROLE OF DISINHIBITION IN BRAIN FUNCTION A Dissertation by YINGWEI YU Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY August 2006 Major Subject: Computer Science COMPUTATIONAL ROLE OF DISINHIBITION IN BRAIN FUNCTION A Dissertation by YINGWEI YU Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirements for the degree of DOCTOR OF PHILOSOPHY Approved by: Chair of Committee, Yoonsuck Choe Committee Members, Ricardo Gutierrez-Osuna Thomas Ioerger Takashi Yamauchi Head of Department, Valerie E. Taylor August 2006 Major Subject: Computer Science iii ABSTRACT Computational Role of Disinhibition in Brain Function. (August 2006) Yingwei Yu, B.E., Beihang University, China Chair of Advisory Committee: Dr. Yoonsuck Choe Neurons are connected to form functional networks in the brain. When neurons are combined in sequence, nontrivial effects arise. One example is disinhibition; that is, inhibition to another inhibitory factor. Disinhibition may be serving an important purpose because a large number of local circuits in the brain contain disinhibitory connections. However, their exact functional role is not well understood. The objective of this dissertation is to analyze the computational role of dis- inhibition in brain function, especially in visual perception and attentional control. My approach is to propose computational models of disinhibition and then map the model to the local circuits in the brain to explain psychological phenomena. Several computational models are proposed in this dissertation to account for disinhibition. (1) A static inverse difference of Gaussian filter (IDoG) is derived to account explic- itly for the spatial effects of disinhibition. -
An Investigation of Tactile Localization and Skin-Based Maps
Where was I touched? – An investigation of tactile localization and skin-based maps Jack Brooks Doctor of Philosophy Neuroscience Research Australia School of Medical Sciences, Faculty of Medicine University of New South Wales November 2017 ii Preface The coding of the position of touch on the skin and of the size and shape of the body are both fundamental for interacting with our surrounds. The aim of this thesis was to learn more about the mechanisms of tactile localization and to characterize the principles by which skin-based representations of the body update. It is commonly accepted that skin-based representations of the body are generated from the statistics of touch and other inputs. My studies required skin stimulation customised to account for inter-individual differences in touch sensitivity and forearm shape. Within the constraints of these methodological challenges, the central questions of this thesis were addressed by performing multiple behavioural experiments. In my first study, I tested how touch intensity and history influence touch localization. The study showed that reducing touch intensity increases the variability of pointing responses to touch and results in spatial biases to the middle of the recent history of touch. Thus, I showed that when uncertain about perceived touch location, a strategy is used that minimises localization errors over time. This error minimisation mechanism stabilises our perception of events on the skin and their sensory features. Next, I investigated uncertainty in a motion stimulus by fragmenting it. Studies in vision suggest that missing sensory inputs are filled-in from the surrounds, while previous tactile studies suggest fragmented motion could influence skin-based representations. -
234 CHAPTER 6: GENERAL DISCUSSION Introduction the Broad Themes of This Thesis Have Ranged from Crossmodal Plasticity to Automat
234 CHAPTER 6: GENERAL DISCUSSION Introduction The broad themes of this thesis have ranged from crossmodal plasticity to automaticity (behavioral and neural), and rehabilitation of the blind population. Crossmodal plasticity is critical to the learning of any sensory substitution encoding, as sensory substitution inherently bridges across two modalities: the sense that receives the information, and that which interprets it. The automaticity of sensory substitution was studied both behaviorally (Chapter 3) and with neural imaging (Chapter 4). Automaticity of SS is critical to improving blind rehabilitation with sensory substitution, and the studies in this thesis will aid in the development of better training techniques and device encodings. Finally, blind rehabilitation has recurred as a theme throughout all of the thesis chapters, and is an important end application of this research. Discussion Crossmodal Plasticity Crossmodal plasticity is the foundation of all sensory substitution learning. Through crossmodal interactions and then plastic changes of those interactions, sensory substitution stimuli are interpreted visually, and action is generated. The type of plasticity, whether strengthening or weakening of existing neural connections or the generation of new neural connections, likely depends on the task, duration of training, and visual deprivation of the participant (i.e., blind or sighted). 235 The experiments in this thesis all rely on plastic changes across the senses to generate improved performance at sensory substitution tasks. The results of these plastic changes are measured behaviorally in Chapters 2 and 3, and with neural imaging (fMRI) in Chapters 4 and 5. In Chapter 2, the constancy processing of SS stimuli (after training) is likely mediated by visual neural regions that are activated by crossmodal plastic changes. -
The Ponzo Illusion with Auditory Substitution of Vision in Sighted and Early-Blind Subjects
Perception, 2005, volume 34, pages 857 ^ 867 DOI:10.1068/p5219 The Ponzo illusion with auditory substitution of vision in sighted and early-blind subjects L Renier, C Laloyauxô, O Collignon, D Tranduy, A Vanlierde, R Bruyer½, A G De Volder# Neural Rehabilitation Engineering Laboratory, Universite¨ Catholique de Louvain, 54 Avenue Hippocrate, Brussels B-1200, Belgium; ô Cognitive Science Research Unit, Universite¨ Libre de Bruxelles, 50 Avenue F D Roosevelt, Brussels B-1050, Belgium; ½ Cognitive Neurosciences Unit, Universite¨ Catholique de Louvain, 10 Place du Cardinal Mercier, Louvain-la-Neuve B-1348, Belgium; e-mail: [email protected] Received 12 February 2004, in revised form 22 November 2004; published online 6 July 2005 Abstract. We tested the effects of using a prosthesis for substitution of vision with audition (PSVA) on sensitivity to the Ponzo illusion. The effects of visual experience on the susceptibility to this illusion were also assessed. In one experiment, both early-blind and blindfolded sighted volunteers used the PSVA to explore several variants of the Ponzo illusion as well as control stimuli. No effects of the illusion were observed. The results indicate that subjects focused their attention on the two central horizontal bars of the stimuli, without processing the contextual cues that convey perspective in the Ponzo figure. In a second experiment, we required subjects to use the PSVA to consider the two converging oblique lines of the stimuli before comparing the length of the two horizontal bars. Here we were able to observe susceptibility to the Ponzo illusion in the sighted group, but to a lesser extent than in a sighted non-PSVA control group. -
Space and Time in Perception and Action Edited by Romi Nijhawan and Beena Khurana Index More Information
Cambridge University Press 978-0-521-86318-6 - Space and Time in Perception and Action Edited by Romi Nijhawan and Beena Khurana Index More information Index absolute time, 1, 232 effect on perceived speed, 233 acceleration, 99, 118, 124, 133, 177, 287, 342, 366, 449, effect on time perception, 269, 272 545 endogenous, 269–271, 532, 543 acuity, visual, 102, 105, 449 exogenous, 269–271 adaptation, 43, 44, 48, 63, 64, 68, 78, 97, 124, 128, 202, 209, in flash-lag effect, 396–403, 414, 423, 479, 487, 493–495 212, 236, 243, 245, 248, 284, 288, 295, 345, 351, 352, in Frohlich¨ effect, 321, 328–331, 334 359, 489, 531, 532 and motion information, 521, 524–526, 528–532 Adelson, E. H., 126, 137, 281, 392, 418, 525, 530 and perceptual asynchrony, 269–271, 516, 517 afference, 13, 57, 95, 97, 211, 423–428, 431, 435, 436, 438, in representational momentum, 343, 348, 358, 367 543–545, 548, 551 and salience, 284, 294 after-image, 13, 33, 95–97, 100 shifts in, 203, 243, 256 aim, target, 109, 110, 113, 118 in temporal order, 170, 174, 272, 286 Alais, D., 233, 240, 272, 273, 402, 479, 481, 482, 493, 546 audiovisual interaction, 236, 243, 245, 247, 278, 279, 284, algorithm, 278, 282, 284, 295, 350, 357, 358 286, 293–295, 303, 546 aliasing. See temporal aliasing audition, 3, 73, 74, 80, 152, 159, 160, 166, 169, 182, 217, 228, allocentric location. See also exocentric location 247, 254, 271, 278, 283, 288, 290, 303, 342, 397, 479, amodal 481, 550 representation, 284 and simultaneity, 232–235, 238, 240, 241, 243, 245, 279, tokens, 278, 279 284, 286, 293–295 Andersen, R. -
TRF1: It Was the Best of Time(S)…
Timing & Time Perception 6 (2018) 231–414 brill.com/time TRF1: It Was the Best of Time(s)… Anne Giersch1 and Jennifer T. Coull2 1INSERM, France 2Laboratoire des Neurosciences Cognitives (UMR 7291), Aix-Marseille University & CNRS, Marseille, France The Timing Research Forum (TRF; http://timingforum.org/) is an interna- tional (Fig. 1), gender-inclusive, and open academic society for timing re- search, founded in 2016 by Argiro Vatakis and Sundeep Teki (Teki, 2016). Following a call to its Committee members in May 2016, we agreed to host the 1st Conference of the Timing Research Forum in Strasbourg, France (TRF1; http://trf-strasbourg.sciencesconf.org). First on the agenda was to decide on eminent keynote speakers to lend credibility to this very first TRF conference. We wanted one talk from the field of psychology and the other from the neurosciences, and so were delighted that both Lera Boro- ditsky and Warren Meck accepted our invitations immediately. Lera kicked off the conference for us, with an extremely entertaining talk about the spatial representation of time in different societies and cultures and how the linguistic metaphors we use to describe time influence our conception of time. Warren highlighted the key role of the striatal dopaminergic sys- tem for timing, illustrating his talk with data from an impressive variety of methodological techniques from the clinical level (performance in patients with Parkinson’s Disease) right down to the cellular (optogenetic studies in mice). Coincidentally, the role of dopamine in timing was also the subject of our third keynote talk. One of the mission statements of TRF is to pro- mote the work of young researchers, and Argiro and Sundeep had the great idea to invite an early-career researcher to give a keynote talk. -
The Kappa Effect in Pitch/Time Context Dissertation
THE KAPPA EFFECT IN PITCH/TIME CONTEXT DISSERTATION Presented in Partial Fulfillment of the Requirements for the degree Doctor of Philosophy in the Graduate School of The Ohio State University By Noah MacKenzie, M.A. ***** The Ohio State University 2007 Dissertation Committee: Professor Mari Jones, Adviser Professor Mark Pitt Approved by Professor James Todd Adviser Psychology Graduate Program ABSTRACT The kappa effect, an effect of spatial extent on the perception of time, is, relatively speaking, poorly understood, especially in the auditory domain. Five experiments demonstrate the kappa effect in the auditory domain by instructing listeners to judge the timing of a tone (Tone X) in relation to a tone immediately preceding it (Tone A) and immediately following it (Tone B). These three tones, together, are referred to as a kappa cell. Experiments 3, 4, and 5 illustrate how the serial context of kappa judgments can influence the strength of the effect. Experiment 1 served as a control experiment to demonstrate the effectiveness of the independent variables. Experiment 2 replicated Shigeno (1986), perhaps the clearest presentation to date of the auditory kappa effect, yet used pitch (frequency on a logarithmic scale) rather than frequency (on a linear scale) as an independent variable. Experiment 3 added a three-tone serial context to the kappa cell. Experiment 4 added a serial context to the kappa cell that strongly conflicted with its pitch trajectory. Experiment 5 examined kappa cells with larger pitch motion (or change in pitch per unit time). Results are discussed in terms of auditory motion and the assumption of constant velocity. -
Applying Emmert's Law to the Poggendorff Illusion
View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Frontiers - Publisher Connector ORIGINAL RESEARCH published: 16 October 2015 doi: 10.3389/fnhum.2015.00531 Applying Emmert’s Law to the Poggendorff illusion Umur Talasli and Asli Bahar Inan* Department of Psychology, Atilim University, Ankara, Turkey The Poggendorff illusion was approached with a novel perspective, that of applying Emmert’s Law to the situation. The extensities between the verticals and the transversals happen to be absolutely equal in retinal image size, whereas the registered distance for the verticals must be smaller than that of the transversals due to the fact that the former is assumed to occlude the latter. This combination of facts calls for the operation of Emmert’s Law, which results in the shrinkage of the occluding space between the verticals. Since the retinal image shows the transversals to be in contact with the verticals, the shrinkage must drag the transversals inwards in the cortical representation in order to eliminate the gaps. Such dragging of the transversals produces the illusory misalignment, which is a dictation of geometry. Some of the consequences of this new explanation were tested in four different experiments. In Experiment 1, a new illusion, the tilting of an occluded continuation of an oblique line, was predicted and achieved. In Experiments 2 and 3, perceived nearness of the occluding entity was Edited by: manipulated via texture density variations and the predicted misalignment variations Baingio Pinna, were confirmed by using a between-subjects and within-subjects designs, respectively. University of Sassari, Italy In Experiment 4, tilting of the occluded segment of the transversal was found to vary in Reviewed by: Branka Spehar, the predicted direction as a result of being accompanied by the same texture cues used University of New South Wales, in Experiments 2 and 3.