Discounting of food and water in rats shows trait‐ and state‐like characteristics

Delay discounting is the loss in value of an outcome as a function of its delay. The present study focused on examining a trait‐like characteristic of delay discounting in a preclinical animal model. Specifically, we were interested in whether there was a positive relation between discounting of 2 d...

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Published in:Journal of the experimental analysis of behavior Vol. 115; no. 2; pp. 495 - 509
Main Authors: Haynes, Jeremy M., Galizio, Ann, Frye, Charles C. J., Towse, Caroline C., Morrissey, Kailey N., Serang, Sarfaraz, Odum, Amy L.
Format: Journal Article
Language:English
Published: Hoboken, USA Wiley Subscription Services, Inc 01.03.2021
Blackwell Publishing Ltd
Subjects:
Animal models
Between-subjects design
Correlation
delay discounting
Delayed
Discounting
Food
Function
mixed effects modeling
rat
Rats
state
trait
Variability
Water
Water supply
mixed effects modeling
trait
state
rat
delay discounting
ISSN:0022-5002, 1938-3711, 1938-3711
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Abstract Delay discounting is the loss in value of an outcome as a function of its delay. The present study focused on examining a trait‐like characteristic of delay discounting in a preclinical animal model. Specifically, we were interested in whether there was a positive relation between discounting of 2 different outcomes in rats. That is, would rats that discount delayed food steeply also discount delayed water steeply? In addition, we examined how session‐to‐session variability in discounting could be attributed to differences between subjects (trait variability) and to differences within subjects (state variability). Finally, we measured discounting from early‐ to mid‐adulthood, allowing us to examine changes in discounting as a function of age. Overall, we found a moderate, positive correlation between discounting of food and discounting of water in rats, providing further evidence that the relative consistency with which individuals discount different outcomes is a trait‐like characteristic. In addition, we found a high degree of within‐subject variability in discounting, indicating strong state‐like differences from session to session. Finally, overall, discounting decreased as a function of age; however, individual‐subject data showed variability in how discounting changed across time. Overall, our results show that differences in delay discounting between individuals reflect variability in both trait‐ and state‐like characteristics.
AbstractList Delay discounting is the loss in value of an outcome as a function of its delay. The present study focused on examining a trait‐like characteristic of delay discounting in a preclinical animal model. Specifically, we were interested in whether there was a positive relation between discounting of 2 different outcomes in rats. That is, would rats that discount delayed food steeply also discount delayed water steeply? In addition, we examined how session‐to‐session variability in discounting could be attributed to differences between subjects (trait variability) and to differences within subjects (state variability). Finally, we measured discounting from early‐ to mid‐adulthood, allowing us to examine changes in discounting as a function of age. Overall, we found a moderate, positive correlation between discounting of food and discounting of water in rats, providing further evidence that the relative consistency with which individuals discount different outcomes is a trait‐like characteristic. In addition, we found a high degree of within‐subject variability in discounting, indicating strong state‐like differences from session to session. Finally, overall, discounting decreased as a function of age; however, individual‐subject data showed variability in how discounting changed across time. Overall, our results show that differences in delay discounting between individuals reflect variability in both trait‐ and state‐like characteristics.
Delay discounting is the loss in value of an outcome as a function of its delay. The present study focused on examining a trait-like characteristic of delay discounting in a preclinical animal model. Specifically, we were interested in whether there was a positive relation between discounting of 2 different outcomes in rats. That is, would rats that discount delayed food steeply also discount delayed water steeply? In addition, we examined how session-to-session variability in discounting could be attributed to differences between subjects (trait variability) and to differences within subjects (state variability). Finally, we measured discounting from early- to mid-adulthood, allowing us to examine changes in discounting as a function of age. Overall, we found a moderate, positive correlation between discounting of food and discounting of water in rats, providing further evidence that the relative consistency with which individuals discount different outcomes is a trait-like characteristic. In addition, we found a high degree of within-subject variability in discounting, indicating strong state-like differences from session to session. Finally, overall, discounting decreased as a function of age; however, individual-subject data showed variability in how discounting changed across time. Overall, our results show that differences in delay discounting between individuals reflect variability in both trait- and state-like characteristics.Delay discounting is the loss in value of an outcome as a function of its delay. The present study focused on examining a trait-like characteristic of delay discounting in a preclinical animal model. Specifically, we were interested in whether there was a positive relation between discounting of 2 different outcomes in rats. That is, would rats that discount delayed food steeply also discount delayed water steeply? In addition, we examined how session-to-session variability in discounting could be attributed to differences between subjects (trait variability) and to differences within subjects (state variability). Finally, we measured discounting from early- to mid-adulthood, allowing us to examine changes in discounting as a function of age. Overall, we found a moderate, positive correlation between discounting of food and discounting of water in rats, providing further evidence that the relative consistency with which individuals discount different outcomes is a trait-like characteristic. In addition, we found a high degree of within-subject variability in discounting, indicating strong state-like differences from session to session. Finally, overall, discounting decreased as a function of age; however, individual-subject data showed variability in how discounting changed across time. Overall, our results show that differences in delay discounting between individuals reflect variability in both trait- and state-like characteristics.
Author Morrissey, Kailey N.
Serang, Sarfaraz
Haynes, Jeremy M.
Galizio, Ann
Frye, Charles C. J.
Towse, Caroline C.
Odum, Amy L.
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  givenname: Ann
  surname: Galizio
  fullname: Galizio, Ann
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  givenname: Charles C. J.
  surname: Frye
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  givenname: Caroline C.
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Keywords mixed effects modeling
trait
state
rat
delay discounting
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Notes This research was supported by a Research Catalyst Seed Grant awarded to ALO by Utah State University's Office of Research.
Portions of this manuscript were presented at the annual Winter Conference of Learning and Behavior in February, 2020.
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Snippet Delay discounting is the loss in value of an outcome as a function of its delay. The present study focused on examining a trait‐like characteristic of delay...
Delay discounting is the loss in value of an outcome as a function of its delay. The present study focused on examining a trait-like characteristic of delay...
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SubjectTerms Animal models
Between-subjects design
Correlation
delay discounting
Delayed
Discounting
Food
Function
mixed effects modeling
rat
Rats
state
trait
Variability
Water
Water supply
Title Discounting of food and water in rats shows trait‐ and state‐like characteristics
URI https://onlinelibrary.wiley.com/doi/abs/10.1002%2Fjeab.677
https://www.ncbi.nlm.nih.gov/pubmed/33556201
https://www.proquest.com/docview/2501873080
https://www.proquest.com/docview/2487747846
Volume 115
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