Memory load affects object individuation in 18-month-old infants

Jennifer Mary Zosh, Lisa Feigenson

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Accurate representation of a changing environment requires individuation-the ability to determine how many numerically distinct objects are present in a scene. Much research has characterized early individuation abilities by identifying which object features infants can use to individuate throughout development. However, despite the fact that without memory featural individuation would be impossible, little is known about how memory constrains object individuation. Here, we investigated infants' ability to individuate multiple objects at once and asked whether individuation performance changes as a function of memory load. In three experiments, 18-month-old infants saw one, two, or three objects hidden and always saw the correct number of objects retrieved. On some trials, one or more of these objects surreptitiously switched identity prior to retrieval. We asked whether infants would use this identity mismatch to individuate and, hence, continue searching for the missing object(s). We found that infants were less likely to individuate objects as memory load grew, but that infants individuated more successfully when the featural contrast between the hidden and retrieved objects increased. These results suggest that remembering more objects may result in a loss of representational precision, thereby decreasing the likelihood of successful individuation. We close by discussing possible links between our results and findings from adult working memory.

Original languageEnglish (US)
Pages (from-to)322-336
Number of pages15
JournalJournal of Experimental Child Psychology
Volume113
Issue number3
DOIs
StatePublished - Nov 1 2012

Fingerprint

Individuation
Aptitude
Short-Term Memory
Research

All Science Journal Classification (ASJC) codes

  • Experimental and Cognitive Psychology
  • Developmental and Educational Psychology

Cite this

@article{eceb369b6a0f4b7aae5a3192e4efe81e,
title = "Memory load affects object individuation in 18-month-old infants",
abstract = "Accurate representation of a changing environment requires individuation-the ability to determine how many numerically distinct objects are present in a scene. Much research has characterized early individuation abilities by identifying which object features infants can use to individuate throughout development. However, despite the fact that without memory featural individuation would be impossible, little is known about how memory constrains object individuation. Here, we investigated infants' ability to individuate multiple objects at once and asked whether individuation performance changes as a function of memory load. In three experiments, 18-month-old infants saw one, two, or three objects hidden and always saw the correct number of objects retrieved. On some trials, one or more of these objects surreptitiously switched identity prior to retrieval. We asked whether infants would use this identity mismatch to individuate and, hence, continue searching for the missing object(s). We found that infants were less likely to individuate objects as memory load grew, but that infants individuated more successfully when the featural contrast between the hidden and retrieved objects increased. These results suggest that remembering more objects may result in a loss of representational precision, thereby decreasing the likelihood of successful individuation. We close by discussing possible links between our results and findings from adult working memory.",
author = "Zosh, {Jennifer Mary} and Lisa Feigenson",
year = "2012",
month = "11",
day = "1",
doi = "10.1016/j.jecp.2012.07.005",
language = "English (US)",
volume = "113",
pages = "322--336",
journal = "Journal of Experimental Child Psychology",
issn = "0022-0965",
publisher = "Academic Press Inc.",
number = "3",

}

Memory load affects object individuation in 18-month-old infants. / Zosh, Jennifer Mary; Feigenson, Lisa.

In: Journal of Experimental Child Psychology, Vol. 113, No. 3, 01.11.2012, p. 322-336.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Memory load affects object individuation in 18-month-old infants

AU - Zosh, Jennifer Mary

AU - Feigenson, Lisa

PY - 2012/11/1

Y1 - 2012/11/1

N2 - Accurate representation of a changing environment requires individuation-the ability to determine how many numerically distinct objects are present in a scene. Much research has characterized early individuation abilities by identifying which object features infants can use to individuate throughout development. However, despite the fact that without memory featural individuation would be impossible, little is known about how memory constrains object individuation. Here, we investigated infants' ability to individuate multiple objects at once and asked whether individuation performance changes as a function of memory load. In three experiments, 18-month-old infants saw one, two, or three objects hidden and always saw the correct number of objects retrieved. On some trials, one or more of these objects surreptitiously switched identity prior to retrieval. We asked whether infants would use this identity mismatch to individuate and, hence, continue searching for the missing object(s). We found that infants were less likely to individuate objects as memory load grew, but that infants individuated more successfully when the featural contrast between the hidden and retrieved objects increased. These results suggest that remembering more objects may result in a loss of representational precision, thereby decreasing the likelihood of successful individuation. We close by discussing possible links between our results and findings from adult working memory.

AB - Accurate representation of a changing environment requires individuation-the ability to determine how many numerically distinct objects are present in a scene. Much research has characterized early individuation abilities by identifying which object features infants can use to individuate throughout development. However, despite the fact that without memory featural individuation would be impossible, little is known about how memory constrains object individuation. Here, we investigated infants' ability to individuate multiple objects at once and asked whether individuation performance changes as a function of memory load. In three experiments, 18-month-old infants saw one, two, or three objects hidden and always saw the correct number of objects retrieved. On some trials, one or more of these objects surreptitiously switched identity prior to retrieval. We asked whether infants would use this identity mismatch to individuate and, hence, continue searching for the missing object(s). We found that infants were less likely to individuate objects as memory load grew, but that infants individuated more successfully when the featural contrast between the hidden and retrieved objects increased. These results suggest that remembering more objects may result in a loss of representational precision, thereby decreasing the likelihood of successful individuation. We close by discussing possible links between our results and findings from adult working memory.

UR - http://www.scopus.com/inward/record.url?scp=84866158398&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84866158398&partnerID=8YFLogxK

U2 - 10.1016/j.jecp.2012.07.005

DO - 10.1016/j.jecp.2012.07.005

M3 - Article

VL - 113

SP - 322

EP - 336

JO - Journal of Experimental Child Psychology

JF - Journal of Experimental Child Psychology

SN - 0022-0965

IS - 3

ER -