In:
PLOS Biology, Public Library of Science (PLoS), Vol. 20, No. 2 ( 2022-2-17), p. e3001529-
Abstract:
An animal that tries to remove a mark from its body that is only visible when looking into a mirror displays the capacity for mirror self-recognition (MSR), which has been interpreted as evidence for self-awareness. Conservative interpretations of existing data conclude that convincing evidence for MSR is currently restricted to great apes. Here, we address proposed shortcomings of a previous study on MSR in the cleaner wrasse Labroides dimidiatus , by varying preexposure to mirrors and by marking individuals with different colors. We found that (1) 14/14 new individuals scraped their throat when a brown mark had been provisioned, but only in the presence of a mirror; (2) blue and green color marks did not elicit scraping; (3) intentionally injecting the mark deeper beneath the skin reliably elicited spontaneous scraping in the absence of a mirror; (4) mirror-naive individuals injected with a brown mark scraped their throat with lower probability and/or lower frequency compared to mirror-experienced individuals; (5) in contrast to the mirror images, seeing another fish with the same marking did not induce throat scraping; and (6) moving the mirror to another location did not elicit renewed aggression in mirror-experienced individuals. Taken together, these results increase our confidence that cleaner fish indeed pass the mark test, although only if it is presented in ecologically relevant contexts. Therefore, we reiterate the conclusion of the previous study that either self-awareness in animals or the validity of the mirror test needs to be revised.
Type of Medium:
Online Resource
ISSN:
1545-7885
DOI:
10.1371/journal.pbio.3001529
DOI:
10.1371/journal.pbio.3001529.g001
DOI:
10.1371/journal.pbio.3001529.g002
DOI:
10.1371/journal.pbio.3001529.g003
DOI:
10.1371/journal.pbio.3001529.g004
DOI:
10.1371/journal.pbio.3001529.t001
DOI:
10.1371/journal.pbio.3001529.t002
DOI:
10.1371/journal.pbio.3001529.s001
DOI:
10.1371/journal.pbio.3001529.s002
DOI:
10.1371/journal.pbio.3001529.s003
DOI:
10.1371/journal.pbio.3001529.s004
DOI:
10.1371/journal.pbio.3001529.r001
DOI:
10.1371/journal.pbio.3001529.r002
DOI:
10.1371/journal.pbio.3001529.r003
DOI:
10.1371/journal.pbio.3001529.r004
DOI:
10.1371/journal.pbio.3001529.r005
DOI:
10.1371/journal.pbio.3001529.r006
DOI:
10.1371/journal.pbio.3001529.r007
DOI:
10.1371/journal.pbio.3001529.r008
DOI:
10.1371/journal.pbio.3001529.r009
Language:
English
Publisher:
Public Library of Science (PLoS)
Publication Date:
2022
detail.hit.zdb_id:
2126773-X
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