The Grasping Side of Odours
- Publication Date
- March 19, 2008
- Journal
- PLOS ONE
- Authors
- Federico Tubaldi, Caterina Ansuini, Roberto Tirindelli & Umberto Castiello
- Volume
- 3
- Issue
- 3
- Pages
- e1795
- DOI
- https://dx.plos.org/10.1371/journal.pone.0001795
- Publisher URL
- http://journals.plos.org/plosone/article?id=10.1371%2Fjournal.pone.0001795
- PubMed
- http://www.ncbi.nlm.nih.gov/pubmed/18350137
- PubMed Central
- http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2266792
- Europe PMC
- http://europepmc.org/abstract/MED/18350137
- Web of Science
- 000260762300003
- Scopus
- 46349107223
- Mendeley
- http://www.mendeley.com/research/grasping-side-odours
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Mendeley | Further Information
{"title"=>"The grasping side of odours", "type"=>"journal", "authors"=>[{"first_name"=>"Federico", "last_name"=>"Tubaldi", "scopus_author_id"=>"16426391200"}, {"first_name"=>"Caterina", "last_name"=>"Ansuini", "scopus_author_id"=>"13104816900"}, {"first_name"=>"Roberto", "last_name"=>"Tirindelli", "scopus_author_id"=>"6603037054"}, {"first_name"=>"Umberto", "last_name"=>"Castiello", "scopus_author_id"=>"7006266454"}], "year"=>2008, "source"=>"PLoS ONE", "identifiers"=>{"scopus"=>"2-s2.0-46349107223", "sgr"=>"46349107223", "issn"=>"19326203", "doi"=>"10.1371/journal.pone.0001795", "pmid"=>"18350137", "isbn"=>"1932-6203 (Electronic)\\r1932-6203 (Linking)", "pui"=>"351917371"}, "id"=>"808dec0f-2049-3ab5-8eac-8fefc58d2d18", "abstract"=>"BACKGROUND: Research on multisensory integration during natural tasks such as reach-to-grasp is still in its infancy. Crossmodal links between vision, proprioception and audition have been identified, but how olfaction contributes to plan and control reach-to-grasp movements has not been decisively shown. We used kinematics to explicitly test the influence of olfactory stimuli on reach-to-grasp movements.\n\nMETHODOLOGY/PRINCIPAL FINDINGS: Subjects were requested to reach towards and grasp a small or a large visual target (i.e., precision grip, involving the opposition of index finger and thumb for a small size target and a power grip, involving the flexion of all digits around the object for a large target) in the absence or in the presence of an odour evoking either a small or a large object that if grasped would require a precision grip and a whole hand grasp, respectively. When the type of grasp evoked by the odour did not coincide with that for the visual target, interference effects were evident on the kinematics of hand shaping and the level of synergies amongst fingers decreased. When the visual target and the object evoked by the odour required the same type of grasp, facilitation emerged and the intrinsic relations amongst individual fingers were maintained.\n\nCONCLUSIONS/SIGNIFICANCE: This study demonstrates that olfactory information contains highly detailed information able to elicit the planning for a reach-to-grasp movement suited to interact with the evoked object. The findings offer a substantial contribution to the current debate about the multisensory nature of the sensorimotor transformations underlying grasping.", "link"=>"http://www.mendeley.com/research/grasping-side-odours", "reader_count"=>53, "reader_count_by_academic_status"=>{"Unspecified"=>1, "Professor > Associate Professor"=>4, "Researcher"=>12, "Student > Doctoral Student"=>1, "Student > Ph. D. Student"=>18, "Student > Postgraduate"=>1, "Other"=>1, "Student > Master"=>5, "Student > Bachelor"=>3, "Lecturer"=>2, "Lecturer > Senior Lecturer"=>1, "Professor"=>4}, "reader_count_by_user_role"=>{"Unspecified"=>1, "Professor > Associate Professor"=>4, "Researcher"=>12, "Student > Doctoral Student"=>1, "Student > Ph. D. Student"=>18, "Student > Postgraduate"=>1, "Other"=>1, "Student > Master"=>5, "Student > Bachelor"=>3, "Lecturer"=>2, "Lecturer > Senior Lecturer"=>1, "Professor"=>4}, "reader_count_by_subject_area"=>{"Engineering"=>3, "Unspecified"=>4, "Nursing and Health Professions"=>1, "Medicine and Dentistry"=>3, "Agricultural and Biological Sciences"=>6, "Neuroscience"=>5, "Arts and Humanities"=>1, "Psychology"=>27, "Social Sciences"=>1, "Computer Science"=>2}, "reader_count_by_subdiscipline"=>{"Engineering"=>{"Engineering"=>3}, "Medicine and Dentistry"=>{"Medicine and Dentistry"=>3}, "Neuroscience"=>{"Neuroscience"=>5}, "Social Sciences"=>{"Social Sciences"=>1}, "Psychology"=>{"Psychology"=>27}, "Agricultural and Biological Sciences"=>{"Agricultural and Biological Sciences"=>6}, "Computer Science"=>{"Computer Science"=>2}, "Nursing and Health Professions"=>{"Nursing and Health Professions"=>1}, "Unspecified"=>{"Unspecified"=>4}, "Arts and Humanities"=>{"Arts and Humanities"=>1}}, "reader_count_by_country"=>{"Sweden"=>1, "United States"=>2, "China"=>1, "United Kingdom"=>1, "United Arab Emirates"=>1, "Germany"=>1}, "group_count"=>1}CrossRef
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Scopus | Further Information
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Journal Comments | Further Information
- {"type"=>"COMMENT", "annotationUri"=>"info:doi/10.1371/annotation/8c18eb25-bc1e-4d39-af0f-326a67ba903d", "title"=>"Referee comments: Referee 1 (Linus Andersson)", "body"=>"Referee 1's review (Linus Andersson):\n\nREVIEW\nTubaldi et al.\nThe Grasping Side of Odours\n\nThis study assessed the relation between the perceived \"size\" of odors and subsequent reaching and grasping movements. This line of inquiry is interesting and of scientific relevance, as it addresses questions regarding olfactory representations and how they are used in motor tasks. These results might also be of interest for interaction designers. The results indicate that olfactory information is useful when planning and executing precise grasping tasks, which suggests that the representations elicited by olfactory information is highly detailed. The study seems to be well conducted and well grounded in previous literature. I have however some comments on the manuscript:\n\n\nGeneral comments\n\nOutline of the manuscript: From reading the introduction and method, I find that the hypotheses and questions are somewhat scattered throughout the text. I find questions and hypotheses in both the introductory text, as well as in the method text (page 4, paragraph 2; p. 5, para 2; p.9; para 2 and on to page 10). Furthermore, the recap of the scientific question in the beginning of the discussion (p. 17) is somewhat different than the questions in the introduction. I think I understand what questions the authors want to answer, but it might become clearer if hypotheses and questions are clearly specified in one place.\n\nUnclear and slightly too long method text: After several readings, I still do not fully grasp what statistical tests were used to answer the scientific questions. I understand the procedure clearly, but at the end of page 9, things begin to become unclear. I understand that the authors have used a planned orthogonal contrasts method, but is the plan to test the effects for \"each participant at each epoch of the normalized movement time (from 10 to 100%, 10% steps) and for all the kinematic variables\" (p. 10)? I am no expert on statistics, but as I remember, the number of planned comparisons should not be more than the available degrees of freedom.\nAt several places, the method gets a bit vague. At the end of page 10, the authors write \"We then evaluated the degree to which the participants' sample exhibited the expected pattern of results by performing one-sample t-test.\" What is the expected pattern here, and how many t-tests were done? On page 11 the authors write \"Here we used this procedure to examine possible differences in covariation patterns across experimental conditions...\" What procedure is referred to here?\nI think that a revision of the method (i.e. explanation of the statistical procedures used) can do great things in terms of accessibility and general understanding of the manuscript. I also believe that this section is a bit long. I suggest that the explanations of and arguments for specific statistical tests are removed.\n\nResults: The results section suffers from some of the problems present in the methods section. The text is slightly too long, and I have difficulties understanding some figures. Especially Figure 10 and Figure 11 is difficult to follow. They depict color coded correlation coefficients for different points during the reaching, but the changes in correlations are difficult to follow. Can these results be presented in another fashion? My guess is that the length of the results section is caused by a very large data set. If the questions stated in the introduction can be answered even after omitting or merging some results in this large data set, it might be a revision to be taken into consideration.\n\nRepresentations or cues? I have a general question of whether or not we can conclude that it is the actual representations elicited by the odours that forms the different grasping patterns, or if the subjects use the odours merely as cues for one of two motor actions. If the former case is true, we can conclude that odour representations are indeed rich in information. If the latter case is true, the subjects learn to associate an odorous stimulus (maybe even without accessing internal representations) to a specific course of action, not necessitating any semantic connection between odour and object. Would we for example get the same results even when exchanging the apple, strawberry, almond and orange odours for completely different odours? The authors describe the odours as \"large\" and \"small\", but these characteristics are taken from the objects, and not the actual odorants. I would much like a short comment on what it is the authors are studying. Is it \"grasping representations\" (p. 4, para 2), a \"motor plan elicited by the olfactory stimulus\" (p. 18, para 2) or indeed maybe even simple cues that initiates one of a few motor actions?\n\nMore specific comments\n1. In the first paragraph of the introduction, the authors state that all sensory modalities are used in reach and grasp tasks. Is this correct? I find little use for example the taste system in these tasks.\n2. On page 9, paragraph 1, the authors write \"Abduction angles were reported on a continuum of negative values with respect to the baseline. An (sic!) decrease in such values indicated relatively greater abduction.\" Does a decrease in negative values imply lower values or higher values?\n\n3. Letters have changed places? On page 8, three rows from the bottom, I suppose it should be \"the fingers straightened, close (not closed) to each other\"\n\n**********\nN.B. These are the comments made by the referee when reviewing an earlier version of this paper. Prior to publication the manuscript has been revised in light of these comments and to address other editorial requirements.", "isRemoved"=>false, "created"=>"2008-03-20T17:45:22Z", "lastModified"=>"2008-03-20T17:45:22Z", "creator"=>{"userId"=>"80539"}, "highlightedText"=>"", "competingInterestStatement"=>{"creatorWasPrompted"=>false, "hasCompetingInterests"=>false}, "parentArticle"=>{"doi"=>"info:doi/10.1371/journal.pone.0001795", "state"=>"published", "journals"=>{"PLoSONE"=>{"journalKey"=>"PLoSONE", "eIssn"=>"1932-6203", "title"=>"PLOS ONE"}}}, "replyTreeSize"=>0, "mostRecentActivity"=>"2008-03-20T17:45:22Z", "replies"=>[]}
- {"type"=>"COMMENT", "annotationUri"=>"info:doi/10.1371/annotation/53ed4235-3299-4452-b3c0-4ba30881ed36", "title"=>"Referee comments: Referee 2", "body"=>"Referee 2's review:\n\nThe paper by Tubaldi & C., which extends previous findings of the same research group, is all in all interesting and suitable for a large diffusion journal. The intro nicely clarifies the potential contribution of the research in the field of multisensory integration for human motor control and the aims of the study are overtly stated. Results are expressed logically and clearly, despite the necessity of complex statistical analyses addressing the several kinematic variables; moreover, they are discussed in the frame of an active literature on multisensory integration. The whole matter is accessible to non-specialists of the field.\n\nA reconsideration of the manuscript should take into account the following points:\n\n1. Choice of odour concentration and odour recognition\nThe amount of the four specific odorant compounds diluted in prophylenic glycol is provided. This is probably the result of the pilot study that Authors report further on in the \"Stimuli and Apparatus\" section. There odour stimuli are said to be judged to have \"equal intensity, hedonic tone and familiarity\". Does it mean that each subject had perfect identification in blind condition of all odours? Was it actually tested? Did this task involve some kind of training session that was not described? Certainly, explicit identification is not mandatory, but it represents an issue by itself.\n\n2. According to the experimental timing (pa. 7), odours were delivered for 3 seconds, 500 ms before reaching initiation. This means that the reaching-to-grasp task was not concurrent with odour processing. Rather, subjects were required to do a sort of implicit olfactory working memory task. I am asking whether a simultaneous odour presentation might have reinforced kinematics effects on grasping. However, the choice of this particular experimental timing should be overtly justified.\n\n3. The grasping movement was sampled at different time points, chosen as discrete equal fractions of the individual total duration of the reaching movement. This made possible the comparison across trails. I understand that this approach is a compromise for normalization of movement time across subjects, but in this way we throw away both total movement duration and possible differences in acceleration during the initial or final reaching phases. These two issues are both potentially relevant to evaluate interactions between odour and reaching-to-grasp movements. Indeed, the instruction given to subjects, invited to grasp with \"a natural speed\", does not guarantee that actually they did so in all trials. Some \"deviations from the mean\" could be a source of potential correlation with some aspects of the reaching-to-grasp pattern and an element of the global effects of odours on motor control.\n\n4. Results indicate that the small or large \"size\" of the odour magnified the pattern of grasping for a small or large object, respectively. On the contrary, when the type of grasp evoked by the odour did not coincide with the size of the visual target, interference emerged. While it is easy to understand the significance of the interference, it is less intuitive to explain in physiological terms what an odour-related facilitation of the human motor system might signify: does \"facilitation\" mean that grasping an object in absence of its odour (as in everyday life common motor tasks) determines a suboptimal reaching pattern and hand shaping?\n\n5. The concept that \"the olfactory representation is mapped into the action vocabulary with high reliability\" (Conclusions paragraph) should be tempered down by considering that this experimental setting considers exclusively the peripersonal space (i.e., the space reference hand/object is a fixed constrain).\n\n6. It is stated that subjects performed 48 trials (8 for each experimental condition), but Fig. 1 reports 20 x 2 trials (40 trials).\nThe reference list contains a paper (Pouget et al. 2002) which is not cited in the text.\nIn general, an effort should be made to reduce the number of figures\n\n**********\nN.B. These are the comments made by the referee when reviewing an earlier version of this paper. Prior to publication the manuscript has been revised in light of these comments and to address other editorial requirements.", "isRemoved"=>false, "created"=>"2008-03-20T17:47:39Z", "lastModified"=>"2008-03-20T17:47:39Z", "creator"=>{"userId"=>"80539"}, "highlightedText"=>"", "competingInterestStatement"=>{"creatorWasPrompted"=>false, "hasCompetingInterests"=>false}, "parentArticle"=>{"doi"=>"info:doi/10.1371/journal.pone.0001795", "state"=>"published", "journals"=>{"PLoSONE"=>{"journalKey"=>"PLoSONE", "eIssn"=>"1932-6203", "title"=>"PLOS ONE"}}}, "replyTreeSize"=>0, "mostRecentActivity"=>"2008-03-20T17:47:39Z", "replies"=>[]}
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- {"month"=>"6", "year"=>"2013", "pdf_views"=>"0", "xml_views"=>"0", "html_views"=>"12"}
- {"month"=>"7", "year"=>"2013", "pdf_views"=>"1", "xml_views"=>"0", "html_views"=>"12"}
- {"month"=>"8", "year"=>"2013", "pdf_views"=>"2", "xml_views"=>"0", "html_views"=>"6"}
- {"month"=>"9", "year"=>"2013", "pdf_views"=>"3", "xml_views"=>"0", "html_views"=>"19"}
- {"month"=>"10", "year"=>"2013", "pdf_views"=>"4", "xml_views"=>"1", "html_views"=>"17"}
- {"month"=>"11", "year"=>"2013", "pdf_views"=>"0", "xml_views"=>"1", "html_views"=>"10"}
- {"month"=>"12", "year"=>"2013", "pdf_views"=>"1", "xml_views"=>"0", "html_views"=>"19"}
- {"month"=>"1", "year"=>"2014", "pdf_views"=>"1", "xml_views"=>"0", "html_views"=>"18"}
- {"month"=>"2", "year"=>"2014", "pdf_views"=>"3", "xml_views"=>"0", "html_views"=>"15"}
- {"month"=>"3", "year"=>"2014", "pdf_views"=>"3", "xml_views"=>"2", "html_views"=>"20"}
- {"month"=>"4", "year"=>"2014", "pdf_views"=>"0", "xml_views"=>"2", "html_views"=>"15"}
- {"month"=>"5", "year"=>"2014", "pdf_views"=>"2", "xml_views"=>"0", "html_views"=>"10"}
- {"month"=>"6", "year"=>"2014", "pdf_views"=>"0", "xml_views"=>"0", "html_views"=>"8"}
- {"month"=>"7", "year"=>"2014", "pdf_views"=>"7", "xml_views"=>"0", "html_views"=>"12"}
- {"month"=>"8", "year"=>"2014", "pdf_views"=>"4", "xml_views"=>"2", "html_views"=>"11"}
- {"month"=>"9", "year"=>"2014", "pdf_views"=>"3", "xml_views"=>"1", "html_views"=>"12"}
- {"month"=>"10", "year"=>"2014", "pdf_views"=>"3", "xml_views"=>"2", "html_views"=>"14"}
- {"month"=>"11", "year"=>"2014", "pdf_views"=>"2", "xml_views"=>"1", "html_views"=>"14"}
- {"month"=>"12", "year"=>"2014", "pdf_views"=>"5", "xml_views"=>"2", "html_views"=>"19"}
- {"month"=>"1", "year"=>"2015", "pdf_views"=>"6", "xml_views"=>"0", "html_views"=>"13"}
- {"month"=>"2", "year"=>"2015", "pdf_views"=>"3", "xml_views"=>"0", "html_views"=>"11"}
- {"month"=>"3", "year"=>"2015", "pdf_views"=>"2", "xml_views"=>"0", "html_views"=>"15"}
- {"month"=>"4", "year"=>"2015", "pdf_views"=>"4", "xml_views"=>"1", "html_views"=>"21"}
- {"month"=>"5", "year"=>"2015", "pdf_views"=>"2", "xml_views"=>"0", "html_views"=>"10"}
- {"month"=>"6", "year"=>"2015", "pdf_views"=>"2", "xml_views"=>"0", "html_views"=>"8"}
- {"month"=>"7", "year"=>"2015", "pdf_views"=>"0", "xml_views"=>"0", "html_views"=>"11"}
- {"month"=>"8", "year"=>"2015", "pdf_views"=>"1", "xml_views"=>"2", "html_views"=>"8"}
- {"month"=>"9", "year"=>"2015", "pdf_views"=>"7", "xml_views"=>"4", "html_views"=>"18"}
- {"month"=>"10", "year"=>"2015", "pdf_views"=>"8", "xml_views"=>"1", "html_views"=>"16"}
- {"month"=>"11", "year"=>"2015", "pdf_views"=>"4", "xml_views"=>"0", "html_views"=>"5"}
- {"month"=>"12", "year"=>"2015", "pdf_views"=>"3", "xml_views"=>"0", "html_views"=>"18"}
- {"month"=>"1", "year"=>"2016", "pdf_views"=>"5", "xml_views"=>"0", "html_views"=>"16"}
- {"month"=>"2", "year"=>"2016", "pdf_views"=>"1", "xml_views"=>"0", "html_views"=>"5"}
- {"month"=>"3", "year"=>"2016", "pdf_views"=>"4", "xml_views"=>"0", "html_views"=>"12"}
- {"month"=>"4", "year"=>"2016", "pdf_views"=>"0", "xml_views"=>"0", "html_views"=>"28"}
- {"month"=>"5", "year"=>"2016", "pdf_views"=>"2", "xml_views"=>"0", "html_views"=>"9"}
- {"month"=>"6", "year"=>"2016", "pdf_views"=>"1", "xml_views"=>"0", "html_views"=>"6"}
- {"month"=>"7", "year"=>"2016", "pdf_views"=>"0", "xml_views"=>"0", "html_views"=>"11"}
- {"month"=>"8", "year"=>"2016", "pdf_views"=>"4", "xml_views"=>"0", "html_views"=>"13"}
- {"month"=>"9", "year"=>"2016", "pdf_views"=>"10", "xml_views"=>"0", "html_views"=>"27"}
- {"month"=>"10", "year"=>"2016", "pdf_views"=>"13", "xml_views"=>"0", "html_views"=>"21"}
- {"month"=>"11", "year"=>"2016", "pdf_views"=>"2", "xml_views"=>"0", "html_views"=>"20"}
- {"month"=>"12", "year"=>"2016", "pdf_views"=>"4", "xml_views"=>"0", "html_views"=>"14"}
- {"month"=>"1", "year"=>"2017", "pdf_views"=>"3", "xml_views"=>"0", "html_views"=>"15"}
- {"month"=>"2", "year"=>"2017", "pdf_views"=>"2", "xml_views"=>"0", "html_views"=>"22"}
- {"month"=>"3", "year"=>"2017", "pdf_views"=>"4", "xml_views"=>"0", "html_views"=>"13"}
- {"month"=>"4", "year"=>"2017", "pdf_views"=>"1", "xml_views"=>"0", "html_views"=>"23"}
- {"month"=>"5", "year"=>"2017", "pdf_views"=>"1", "xml_views"=>"0", "html_views"=>"17"}
- {"month"=>"6", "year"=>"2017", "pdf_views"=>"0", "xml_views"=>"0", "html_views"=>"30"}
- {"month"=>"7", "year"=>"2017", "pdf_views"=>"3", "xml_views"=>"0", "html_views"=>"7"}
- {"month"=>"8", "year"=>"2017", "pdf_views"=>"2", "xml_views"=>"1", "html_views"=>"6"}
- {"month"=>"9", "year"=>"2017", "pdf_views"=>"6", "xml_views"=>"2", "html_views"=>"19"}
- {"month"=>"10", "year"=>"2017", "pdf_views"=>"6", "xml_views"=>"1", "html_views"=>"23"}
- {"month"=>"11", "year"=>"2017", "pdf_views"=>"4", "xml_views"=>"1", "html_views"=>"8"}
- {"month"=>"12", "year"=>"2017", "pdf_views"=>"2", "xml_views"=>"2", "html_views"=>"19"}
- {"month"=>"1", "year"=>"2018", "pdf_views"=>"1", "xml_views"=>"0", "html_views"=>"6"}
- {"month"=>"2", "year"=>"2018", "pdf_views"=>"6", "xml_views"=>"0", "html_views"=>"5"}
- {"month"=>"3", "year"=>"2018", "pdf_views"=>"4", "xml_views"=>"1", "html_views"=>"9"}
- {"month"=>"4", "year"=>"2018", "pdf_views"=>"1", "xml_views"=>"1", "html_views"=>"3"}
- {"month"=>"5", "year"=>"2018", "pdf_views"=>"1", "xml_views"=>"1", "html_views"=>"2"}
- {"month"=>"6", "year"=>"2018", "pdf_views"=>"8", "xml_views"=>"2", "html_views"=>"2"}
- {"month"=>"7", "year"=>"2018", "pdf_views"=>"3", "xml_views"=>"3", "html_views"=>"1"}
- {"month"=>"8", "year"=>"2018", "pdf_views"=>"2", "xml_views"=>"1", "html_views"=>"1"}
- {"month"=>"9", "year"=>"2018", "pdf_views"=>"3", "xml_views"=>"0", "html_views"=>"3"}
- {"month"=>"10", "year"=>"2018", "pdf_views"=>"1", "xml_views"=>"1", "html_views"=>"7"}
- {"month"=>"11", "year"=>"2018", "pdf_views"=>"2", "xml_views"=>"0", "html_views"=>"3"}
- {"month"=>"12", "year"=>"2018", "pdf_views"=>"2", "xml_views"=>"1", "html_views"=>"3"}
- {"month"=>"1", "year"=>"2019", "pdf_views"=>"4", "xml_views"=>"0", "html_views"=>"0"}
- {"month"=>"2", "year"=>"2019", "pdf_views"=>"2", "xml_views"=>"0", "html_views"=>"0"}
- {"month"=>"3", "year"=>"2019", "pdf_views"=>"6", "xml_views"=>"0", "html_views"=>"1"}
- {"month"=>"4", "year"=>"2019", "pdf_views"=>"4", "xml_views"=>"0", "html_views"=>"0"}
- {"month"=>"5", "year"=>"2019", "pdf_views"=>"2", "xml_views"=>"0", "html_views"=>"1"}
- {"month"=>"6", "year"=>"2019", "pdf_views"=>"8", "xml_views"=>"0", "html_views"=>"1"}
- {"month"=>"7", "year"=>"2019", "pdf_views"=>"6", "xml_views"=>"0", "html_views"=>"3"}
- {"month"=>"8", "year"=>"2019", "pdf_views"=>"6", "xml_views"=>"0", "html_views"=>"0"}
- {"month"=>"9", "year"=>"2019", "pdf_views"=>"5", "xml_views"=>"0", "html_views"=>"1"}
- {"month"=>"10", "year"=>"2019", "pdf_views"=>"1", "xml_views"=>"0", "html_views"=>"1"}
- {"month"=>"11", "year"=>"2019", "pdf_views"=>"9", "xml_views"=>"0", "html_views"=>"4"}
- {"month"=>"12", "year"=>"2019", "pdf_views"=>"11", "xml_views"=>"2", "html_views"=>"0"}
- {"month"=>"1", "year"=>"2020", "pdf_views"=>"15", "xml_views"=>"1", "html_views"=>"32"}
- {"month"=>"2", "year"=>"2020", "pdf_views"=>"4", "xml_views"=>"0", "html_views"=>"5"}
- {"month"=>"3", "year"=>"2020", "pdf_views"=>"8", "xml_views"=>"0", "html_views"=>"4"}
- {"month"=>"4", "year"=>"2020", "pdf_views"=>"5", "xml_views"=>"0", "html_views"=>"3"}
- {"month"=>"5", "year"=>"2020", "pdf_views"=>"9", "xml_views"=>"1", "html_views"=>"2"}
- {"month"=>"6", "year"=>"2020", "pdf_views"=>"2", "xml_views"=>"1", "html_views"=>"3"}
- {"month"=>"7", "year"=>"2020", "pdf_views"=>"2", "xml_views"=>"0", "html_views"=>"1"}
- {"month"=>"8", "year"=>"2020", "pdf_views"=>"3", "xml_views"=>"0", "html_views"=>"5"}
- {"month"=>"9", "year"=>"2020", "pdf_views"=>"3", "xml_views"=>"0", "html_views"=>"2"}
- {"month"=>"10", "year"=>"2020", "pdf_views"=>"14", "xml_views"=>"0", "html_views"=>"1"}
- {"month"=>"11", "year"=>"2020", "pdf_views"=>"9", "xml_views"=>"1", "html_views"=>"5"}
- {"month"=>"12", "year"=>"2020", "pdf_views"=>"3", "xml_views"=>"3", "html_views"=>"4"}
- {"month"=>"1", "year"=>"2021", "pdf_views"=>"0", "xml_views"=>"0", "html_views"=>"2"}
PMC Usage Stats | Further Information
- {"month"=>"1", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"6", "year"=>"2010", "pdf"=>"2", "unique-ip"=>"5", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"2", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"2", "unique-ip"=>"3", "pdf"=>"0", "year"=>"2010", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"3", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"12", "year"=>"2010", "pdf"=>"5", "unique-ip"=>"9", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"4", "cited-by"=>"0", "abstract"=>"1", "full-text"=>"10", "unique-ip"=>"9", "pdf"=>"2", "year"=>"2010", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"5", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"3", "year"=>"2010", "pdf"=>"2", "unique-ip"=>"3", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"6", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"7", "unique-ip"=>"8", "pdf"=>"3", "year"=>"2010", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"7", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"5", "year"=>"2010", "pdf"=>"4", "unique-ip"=>"5", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"8", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"1", "unique-ip"=>"2", "pdf"=>"2", "year"=>"2010", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"9", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"2", "full-text"=>"8", "year"=>"2010", "pdf"=>"4", "unique-ip"=>"8", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"10", "cited-by"=>"0", "abstract"=>"2", "full-text"=>"6", "unique-ip"=>"8", "pdf"=>"0", "year"=>"2010", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"11", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"2", "year"=>"2010", "pdf"=>"2", "unique-ip"=>"4", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"12", "cited-by"=>"0", "abstract"=>"1", "full-text"=>"2", "unique-ip"=>"5", "pdf"=>"1", "year"=>"2010", "figure"=>"1", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"1", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"3", "year"=>"2011", "pdf"=>"0", "unique-ip"=>"3", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"2", "cited-by"=>"0", "abstract"=>"1", "full-text"=>"3", "unique-ip"=>"4", "pdf"=>"2", "year"=>"2011", "figure"=>"1", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"3", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"1", "full-text"=>"4", "year"=>"2011", "pdf"=>"5", "unique-ip"=>"4", "figure"=>"1", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"4", "cited-by"=>"0", "abstract"=>"1", "full-text"=>"1", "unique-ip"=>"3", "pdf"=>"0", "year"=>"2011", "figure"=>"3", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"5", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"2", "full-text"=>"1", "year"=>"2011", "pdf"=>"1", "unique-ip"=>"4", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"6", "cited-by"=>"0", "abstract"=>"1", "full-text"=>"8", "unique-ip"=>"14", "pdf"=>"13", "year"=>"2011", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"7", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"4", "year"=>"2011", "pdf"=>"1", "unique-ip"=>"5", "figure"=>"1", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"9", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"1", "unique-ip"=>"1", "pdf"=>"0", "year"=>"2011", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"10", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"2", "year"=>"2011", "pdf"=>"1", "unique-ip"=>"3", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"12", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"1", "unique-ip"=>"1", "pdf"=>"0", "year"=>"2011", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"1", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"1", "full-text"=>"0", "year"=>"2012", "pdf"=>"0", "unique-ip"=>"1", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"2", "cited-by"=>"0", "abstract"=>"1", "full-text"=>"2", "unique-ip"=>"3", "pdf"=>"1", "year"=>"2012", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"3", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"5", "year"=>"2012", "pdf"=>"2", "unique-ip"=>"5", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"4", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"3", "unique-ip"=>"4", "pdf"=>"0", "year"=>"2012", "figure"=>"1", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"5", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"1", "year"=>"2012", "pdf"=>"4", "unique-ip"=>"3", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"14", "month"=>"3", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"1", "unique-ip"=>"0", "pdf"=>"0", "year"=>"2008", "figure"=>"28", "scanned-summary"=>"13", "supp-data"=>"17"}
- {"month"=>"4", "scanned-page-browse"=>"25", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"1", "year"=>"2008", "pdf"=>"0", "unique-ip"=>"3", "figure"=>"59", "scanned-summary"=>"30", "supp-data"=>"33"}
- {"scanned-page-browse"=>"10", "month"=>"5", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"0", "unique-ip"=>"0", "pdf"=>"0", "year"=>"2008", "figure"=>"34", "scanned-summary"=>"24", "supp-data"=>"23"}
- {"month"=>"6", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"2", "full-text"=>"10", "year"=>"2008", "pdf"=>"5", "unique-ip"=>"12", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"7", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"6", "unique-ip"=>"7", "pdf"=>"1", "year"=>"2008", "figure"=>"2", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"8", "scanned-page-browse"=>"3", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"1", "year"=>"2008", "pdf"=>"0", "unique-ip"=>"0", "figure"=>"9", "scanned-summary"=>"5", "supp-data"=>"6"}
- {"scanned-page-browse"=>"0", "month"=>"9", "cited-by"=>"0", "abstract"=>"6", "full-text"=>"14", "unique-ip"=>"18", "pdf"=>"6", "year"=>"2008", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"10", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"3", "full-text"=>"17", "year"=>"2008", "pdf"=>"3", "unique-ip"=>"16", "figure"=>"1", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"11", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"7", "unique-ip"=>"6", "pdf"=>"3", "year"=>"2008", "figure"=>"1", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"12", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"6", "year"=>"2008", "pdf"=>"1", "unique-ip"=>"6", "figure"=>"1", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"scanned-page-browse"=>"0", "month"=>"1", "cited-by"=>"0", "abstract"=>"0", "full-text"=>"8", "unique-ip"=>"8", "pdf"=>"5", "year"=>"2009", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
- {"month"=>"2", "scanned-page-browse"=>"0", "cited-by"=>"0", "abstract"=>"1", "full-text"=>"5", "year"=>"2009", "pdf"=>"6", "unique-ip"=>"9", "figure"=>"0", "scanned-summary"=>"0", "supp-data"=>"0"}
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Relative Metric
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