Project 2490: M. A. O'Leary, K. Alphonse, M. Arce Hernandez, D. Cavaliere, A. Cirranello, T. Dietterich, M. Julius, S. Kaufman, E. Law, M. Passarotti, A. Reft, J. Robalino, N. B. Simmons, S. Smith, D. Stevenson, E. Theriot, P. M. Velazco, R. Walls, M. Yu, M. Daly. 2018. Crowds replicate performance of scientific experts scoring phylogenetic matrices of phenotypes. Systematic Biology. 67 (1):49-60. (In Press)
Specimen: Cyclotella meneghiniana (unvouchered)
View: Composite - mixed images

Abstract

Scientists building the Tree of Life face an overwhelming challenge to categorize phenotypes (e.g., anatomy, physiology) from millions of living and fossil species. This biodiversity challenge far outstrips the capacities of trained scientific experts. Here we explore whether crowdsourcing can be used to collect matrix data on a large scale with the participation of the non-expert students, or “citizen scientists.” Crowdsourcing, or data collection by non-experts, frequently via the internet, has enabled scientists to tackle some large-scale data collection challenges too massive for individuals or scientific teams alone. The quality of work by non-expert crowds is, however, often questioned and little data has been collected on how such crowds perform on complex tasks such as phylogenetic character coding. We studied a crowd of over 600 non-experts, and found that they could use images to identify anatomical similarity (hypotheses of homology) with an average accuracy of 82% compared to scores provided by experts in the field. This performance pattern held across the Tree of Life, from protists to vertebrates. We introduce a procedure that predicts the difficulty of each character and that can be used to assign harder characters to experts and easier characters to a non-expert crowd for scoring. We test this procedure in a controlled experiment comparing crowd scores to those of experts and show that crowds can produce matrices with over 90% of cells scored correctly while reducing the number of cells to be scored by experts by 50%. Preparation time, including image collection and processing, for a crowdsourcing experiment is significant, and does not currently save time of scientific experts overall. However, if innovations in automation or robotics can reduce such effort, then large-scale implementation of our method could greatly increase the collective scientific knowledge of species phenotypes for phylogenetic tree building. For the field of crowdsourcing, we provide a rare study with ground truth, or an experimental control that many studies lack, and contribute new methods on how to coordinate the work of experts and non-experts. We show that there are important instances in which crowd consensus is not a good proxy for correctness.


Read the article »

Article DOI: https://doi.org/10.1093/sysbio/syx052

Project DOI: 10.7934/P2490, http://dx.doi.org/10.7934/P2490
This project containsMatrices
  • 259 Media
  • 1 Matrix
  • 1 Document
  • 14 Taxa
  • 22 Specimens
  • 8 Characters
Total size of project's media files: 415 MB

Download Project SDD File
Total scored cells: 103
Total media associated with cells: 106
Total labels associated with cell media: 1
Characters
Total characters: 8
Total characters with associated media: 3
Total characters with media with labels: 0
Total character states: 23
Total character states with associated media: 23
Total character states with media with labels:1
Total unordered/ordered characters:8/0
Currently Viewing:
MorphoBank Project 2490

    This research
    supported by



    Members

    member name taxa specimens media chars character
    media
    labels
    cell scorings
    (scored, NPA, "-")
    cell
    medialabels
    rules
    Edward Theriot
    Project Administrator
    Last logged in Never
    0000000
    (0, 0, 0)
    000
    Matthew Julius
    Full membership
    Last logged in Never
    0000000
    (0, 0, 0)
    000
    Maureen O'Leary
    Full membership
    Last logged in Never
    0000000
    (0, 0, 0)
    000
    Anna Mengjie Yu
    Full membership
    Last logged in Never
    0000000
    (0, 0, 0)
    000


    Taxonomic Overview for Matrix 'M24106' (13 Taxa)

    taxon unscored
    cells
    scored
    cells
    no cell
    support
    NPA
    cells
    "-" cellscell images labels on
    cell images
    member
    access
    [1] Cyclotella atomus atomus
    Last Modified in 07/05/16
    0800081none
    [2] Cyclotella distinguenda
    Last Modified in 07/05/16
    0800080none
    [3] Cyclotella atomus marina
    Last Modified in 07/05/16
    0800080none
    [4] Cyclotella gamma
    Last Modified in 07/05/16
    0800080none
    [5] Cyclotella choctawhatcheeana
    Last Modified in 07/05/16
    0800090none
    [6] Cyclotella cryptica
    Last Modified in 07/05/16
    1700090none
    [7] Cyclotella litoralis
    Last Modified in 07/05/16
    0800080none
    [8] Cyclotella cf. meneghiniana (l1263)
    Last Modified in 07/05/16
    0800080none
    [9] Cyclotella nana
    Last Modified in 07/05/16
    0800080none
    [10] Cyclotella quillensis
    Last Modified in 07/05/16
    0800080none
    [11] † Cyclotella undescribed miocene ect 765
    Last Modified in 07/05/16
    0800080none
    [12] Cyclotella striata
    Last Modified in 07/05/16
    0800080none
    [13] Cyclotella stylorum
    Last Modified in 07/05/16
    0800080none


    Project views

    type number of views Individual items viewed (where applicable)
    Total project views19656
    Project overview540
    Matrix views302Matrix landing page (292 views); Cyclotella qualitative characters (10 views);
    Media views15549Media search (794 views); M424498 (99 views); M424509 (114 views); M424547 (93 views); M424572 (80 views); M424488 (122 views); M424487 (97 views); M424502 (89 views); M424485 (93 views); M424541 (91 views); M424520 (100 views); M424562 (95 views); M424504 (104 views); M424529 (107 views); M424531 (92 views); M424567 (86 views); M424538 (94 views); M424500 (108 views); M424482 (84 views); M424511 (163 views); M424551 (110 views); M424478 (100 views); M424568 (102 views); M424609 (34 views); M424664 (31 views); M424586 (65 views); M424690 (43 views); M424651 (41 views); M424695 (31 views); M424614 (36 views); M424688 (70 views); M424640 (30 views); M424663 (36 views); M424677 (27 views); M424685 (51 views); M424655 (34 views); M424595 (32 views); M424696 (30 views); M424699 (30 views); M424604 (53 views); M424556 (109 views); M424607 (31 views); M424686 (28 views); M424659 (35 views); M424577 (90 views); M424544 (111 views); M424493 (99 views); M424570 (99 views); M424512 (104 views); M424650 (32 views); M424674 (35 views); M424611 (31 views); M424675 (50 views); M424693 (33 views); M424658 (41 views); M424592 (32 views); M424616 (33 views); M424589 (50 views); M424700 (35 views); M424631 (31 views); M424601 (58 views); M424641 (30 views); M424638 (30 views); M424625 (35 views); M424612 (42 views); M424662 (35 views); M424584 (30 views); M424669 (29 views); M424596 (57 views); M424665 (33 views); M424642 (36 views); M424639 (31 views); M424678 (27 views); M424585 (71 views); M424646 (42 views); M424626 (27 views); M424666 (53 views); M424661 (34 views); M424579 (57 views); M424636 (48 views); M424652 (36 views); M424682 (33 views); M424599 (31 views); M424657 (37 views); M424582 (32 views); M424583 (68 views); M424672 (29 views); M424689 (36 views); M424597 (30 views); M424550 (97 views); M424491 (92 views); M424539 (83 views); M424533 (93 views); M424554 (95 views); M424517 (94 views); M424480 (94 views); M424522 (94 views); M424495 (82 views); M424507 (135 views); M424569 (76 views); M424676 (34 views); M424610 (52 views); M424492 (111 views); M424654 (26 views); M424540 (96 views); M424602 (33 views); M424647 (30 views); M424645 (27 views); M424573 (90 views); M424588 (34 views); M424593 (42 views); M424660 (55 views); M424598 (31 views); M424615 (45 views); M424701 (94 views); M424608 (42 views); M424667 (57 views); M424697 (35 views); M424648 (36 views); M424668 (30 views); M424549 (101 views); M424523 (115 views); M424687 (32 views); M424627 (40 views); M424624 (67 views); M424581 (34 views); M424643 (48 views); M424670 (35 views); M424629 (33 views); M424628 (33 views); M424578 (30 views); M424622 (59 views); M424594 (49 views); M424606 (52 views); M424694 (32 views); M424656 (40 views); M424632 (34 views); M424680 (33 views); M424580 (38 views); M424698 (45 views); M424692 (32 views); M424618 (51 views); M424635 (33 views); M424673 (43 views); M424634 (36 views); M424603 (29 views); M424630 (65 views); M424633 (39 views); M424613 (57 views); M424683 (31 views); M424681 (39 views); M424619 (49 views); M424620 (29 views); M424679 (44 views); M424591 (33 views); M424605 (32 views); M424617 (37 views); M424590 (30 views); M424621 (55 views); M424653 (37 views); M424684 (29 views); M424691 (30 views); M424587 (58 views); M424637 (70 views); M424600 (33 views); M424671 (44 views); M424649 (28 views); M424501 (75 views); M424483 (111 views); M424565 (95 views); M424490 (98 views); M424481 (111 views); M424536 (79 views); M424564 (99 views); M424548 (95 views); M424532 (91 views); M424489 (91 views); M424576 (84 views); M424534 (106 views); M424486 (88 views); M424546 (112 views); M424537 (99 views); M424513 (101 views); M424574 (104 views); M424496 (102 views); M424527 (95 views); M424508 (86 views); M424557 (84 views); M424530 (96 views); M424566 (106 views); M424571 (107 views); M424552 (102 views); M424525 (107 views); M424519 (88 views); M424515 (83 views); M424563 (83 views); M424516 (101 views); M424543 (111 views); M424506 (99 views); M424503 (80 views); M424514 (102 views); M424560 (102 views); M424542 (97 views); M424499 (83 views); M424575 (100 views); M424545 (98 views); M424559 (81 views); M424526 (116 views); M424555 (121 views); M424497 (100 views); M424702 (38 views); M424479 (85 views); M424558 (86 views); M424623 (35 views); M424521 (97 views); M424484 (96 views); M424553 (105 views); M424535 (89 views); M424518 (107 views); M424644 (31 views); M424494 (95 views); M424528 (96 views); M424505 (93 views); M424712 (1 view); M424561 (109 views); M424524 (112 views); M424510 (90 views);
    Taxon list364
    Specimen list1779
    Views for media list640
    Bibliography187
    Documents list295




    Project downloads

    type number of downloads Individual items downloaded (where applicable)
    Total downloads from project48
    Project downloads46
    Matrix downloads2Cyclotella qualitative characters (2 downloads);