Direct and Indirect Haptic Calibration of Visual Size Judgments
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{"title"=>"Direct and indirect haptic calibration of visual size judgments", "type"=>"journal", "authors"=>[{"first_name"=>"Monica", "last_name"=>"Gori", "scopus_author_id"=>"23491803400"}, {"first_name"=>"Alessandra", "last_name"=>"Sciutti", "scopus_author_id"=>"36957816700"}, {"first_name"=>"David", "last_name"=>"Burr", "scopus_author_id"=>"7102039806"}, {"first_name"=>"Giulio", "last_name"=>"Sandini", "scopus_author_id"=>"35280694500"}], "year"=>2011, "source"=>"PLoS ONE", "identifiers"=>{"pmid"=>"22022420", "sgr"=>"80054083437", "doi"=>"10.1371/journal.pone.0025599", "scopus"=>"2-s2.0-80054083437", "pui"=>"362750912", "isbn"=>"1932-6203 (Electronic)\\r1932-6203 (Linking)", "issn"=>"19326203"}, "id"=>"7aa86df3-f9f4-3953-9d67-eda451abd65d", "abstract"=>"It has long been suspected that touch plays a fundamental role in the calibration of visual perception, and much recent evidence supports this idea. However, as the haptic exploration workspace is limited by the kinematics of the body, the contribution of haptic information to the calibration process should occur only within the region of the haptic workspace reachable by a limb (peripersonal space). To test this hypothesis we evaluated visual size perception and showed that it is indeed more accurate inside the peripersonal space. We then show that allowing subjects to touch the (unseen) stimulus after observation restores accurate size perception; the accuracy persists for some time, implying that calibration has occurred. Finally, we show that observing an actor grasp the object also produces accurate (and lasting) size perception, suggesting that the calibration can also occur indirectly by observing goal-directed actions, implicating the involvement of the \"mirror system\".", "link"=>"http://www.mendeley.com/research/direct-indirect-haptic-calibration-visual-size-judgments", "reader_count"=>41, "reader_count_by_academic_status"=>{"Professor > Associate Professor"=>3, "Researcher"=>10, "Student > Doctoral Student"=>1, "Student > Ph. D. Student"=>12, "Student > Postgraduate"=>1, "Student > Master"=>8, "Student > Bachelor"=>2, "Lecturer"=>1, "Professor"=>3}, "reader_count_by_user_role"=>{"Professor > Associate Professor"=>3, "Researcher"=>10, "Student > Doctoral Student"=>1, "Student > Ph. D. Student"=>12, "Student > Postgraduate"=>1, "Student > Master"=>8, "Student > Bachelor"=>2, "Lecturer"=>1, "Professor"=>3}, "reader_count_by_subject_area"=>{"Engineering"=>2, "Unspecified"=>4, "Medicine and Dentistry"=>2, "Agricultural and Biological Sciences"=>1, "Neuroscience"=>4, "Arts and Humanities"=>1, "Sports and Recreations"=>1, "Psychology"=>23, "Computer Science"=>3}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>2}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>2}, "Neuroscience"=>{"Neuroscience"=>4}, "Sports and Recreations"=>{"Sports and Recreations"=>1}, "Psychology"=>{"Psychology"=>23}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>1}, "Computer Science"=>{"Computer Science"=>3}, "Unspecified"=>{"Unspecified"=>4}, "Arts and Humanities"=>{"Arts and Humanities"=>1}}, "reader_count_by_country"=>{"United States"=>1, "United Kingdom"=>1, "Italy"=>1, "United Arab Emirates"=>1, "Germany"=>1}, "group_count"=>2}

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Figshare

  • {"files"=>["https://ndownloader.figshare.com/files/725236"], "description"=>"<p>Data of individual subjects, plotting the bias in the “grasp-observation” condition against that in the “no-action” condition, for the <i>comparison task</i> (A) and <i>reproduction task</i> (B) for 120 cm of distance. The error bars show ±1 SEM, estimated by bootstrap for the <i>comparison task</i> and from the matching variance for the <i>reproduction task</i>.</p>", "links"=>[], "tags"=>["Mental health", "neuroscience"], "article_id"=>395592, "categories"=>["Neuroscience", "Mental Health"], "users"=>["Monica Gori", "Alessandra Sciutti", "David Burr", "Giulio Sandini"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0025599.g002", "stats"=>{"downloads"=>0, "page_views"=>0, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Individual_data_for_8220_no_action_8221_and_8220_grasp_observation_8221_conditions_/395592", "title"=>"Individual data for “no-action” and “grasp-observation” conditions.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2011-10-13 01:33:12"}
  • {"files"=>["https://ndownloader.figshare.com/files/725310"], "description"=>"<p><b>A.</b> Average biases (<i>reproduction task</i>) of 5 subjects in judging the size of a sphere at 120 cm for the ”no-action” condition (red bar) and when subjects also blindly felt the sphere in the “haptic-feedback” condition (green bar). The blue bar shows the biases of the same subjects retested in the “no-action” task after the “haptic-feedback” test. Error bars represent ±1 SEM of inter-subject variability. <b>B.</b> Average biases (<i>comparison task</i>) in judging the size perception of a sphere at a distance of 120 cm. The red bar refers to the “no-action” condition, the blue to visual judgments after observing an actor grasping the sphere (“grasp-observation” condition). The yellow and light-blue bars show two control conditions, respectively observation of a stationary hand holding the spheres (“static” condition) and observing a releasing movement (“backward” condition). Error bars represent ±1 SEM of inter-subject variability. <b>C.</b> Same as B for <i>reproduction task</i>. In all cases, one and two stars represent, respectively, significance levels of less than 0.05 and 0.01 in a repeated measures one-way ANOVA and Bonferroni post-hoc test.</p>", "links"=>[], "tags"=>["Mental health", "neuroscience"], "article_id"=>395667, "categories"=>["Neuroscience", "Mental Health"], "users"=>["Monica Gori", "Alessandra Sciutti", "David Burr", "Giulio Sandini"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0025599.g003", "stats"=>{"downloads"=>2, "page_views"=>10, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Effect_of_touch_and_observation_of_touch_on_visual_bias_/395667", "title"=>"Effect of touch and observation of touch on visual bias.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2011-10-13 01:34:27"}
  • {"files"=>["https://ndownloader.figshare.com/files/725139"], "description"=>"<p><b>A.</b> Illustration of the <i>comparison task</i>. <b>B.</b> Illustration of the <i>reproduction task</i>. <b>C.</b> Mean bias in size perception (13 subjects) as a function of sphere position for the <i>comparison task</i>. The red line and dots refer to the average responses when only the sphere was presented (“no-action” condition). The blue line and dots refer to the average response when subjects observed a grasping action (“grasp- observation” condition). The vertical dashed line indicates the limit of the haptic workspace: The 42.5 and the 60 cm distances fall within the haptic workspace while the 85 and 120 cm distances fall beyond it. Error bars represent ±1 SEM of inter-subject variability. <b>D.</b> Same as C for the <i>reproduction task</i> (10 subjects). <b>E.</b> Average precision thresholds as a function of sphere position for the <i>comparison task</i>. The thresholds are an indication of consistency of the response, given by the standard deviation of the cumulative Gaussian psychometric function that fits the comparison data. Error bars represent ±1 SEM of inter-subject variability (same conventions as <a href=\"http://www.plosone.org/article/info:doi/10.1371/journal.pone.0025599#pone-0025599-g001\" target=\"_blank\">Fig. 1C</a>). <b>F.</b> Same as E for the <i>reproduction task</i>. Here the thresholds are the standard deviations of the distributions of matched sizes. In all cases, two stars represent a significance level of less than 0.01 and one star a significance level of less than 0.05 in a repeated measures two-way ANOVA, and Bonferroni post-hoc test.</p>", "links"=>[], "tags"=>["Mental health", "neuroscience"], "article_id"=>395502, "categories"=>["Neuroscience", "Mental Health"], "users"=>["Monica Gori", "Alessandra Sciutti", "David Burr", "Giulio Sandini"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0025599.g001", "stats"=>{"downloads"=>0, "page_views"=>2, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/_Setup_and_results_for_size_judgment_tasks_/395502", "title"=>"Setup and results for size judgment tasks.", "pos_in_sequence"=>0, "defined_type"=>1, "published_date"=>"2011-10-13 01:31:42"}
  • {"files"=>["https://ndownloader.figshare.com/files/366526"], "description"=>"<div><p>It has long been suspected that touch plays a fundamental role in the calibration of visual perception, and much recent evidence supports this idea. However, as the haptic exploration workspace is limited by the kinematics of the body, the contribution of haptic information to the calibration process should occur only within the region of the haptic workspace reachable by a limb (peripersonal space). To test this hypothesis we evaluated visual size perception and showed that it is indeed more accurate inside the peripersonal space. We then show that allowing subjects to touch the (unseen) stimulus after observation restores accurate size perception; the accuracy persists for some time, implying that calibration has occurred. Finally, we show that observing an actor grasp the object also produces accurate (and lasting) size perception, suggesting that the calibration can also occur indirectly by observing goal-directed actions, implicating the involvement of the “mirror system”.</p> </div>", "links"=>[], "tags"=>["indirect", "haptic", "calibration", "judgments"], "article_id"=>132431, "categories"=>["Neuroscience", "Mental Health"], "users"=>["Monica Gori", "Alessandra Sciutti", "David Burr", "Giulio Sandini"], "doi"=>"https://dx.doi.org/10.1371/journal.pone.0025599", "stats"=>{"downloads"=>1, "page_views"=>6, "likes"=>0}, "figshare_url"=>"https://figshare.com/articles/Direct_and_Indirect_Haptic_Calibration_of_Visual_Size_Judgments/132431", "title"=>"Direct and Indirect Haptic Calibration of Visual Size Judgments", "pos_in_sequence"=>0, "defined_type"=>2, "published_date"=>"2011-10-13 00:40:31"}

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Relative Metric

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