The DOI matches its Crossref record.
Rats' Preference for Earned in Comparison with Free Food
Abstract
Rats were trained to eat free food from a dish, then trained to press a lever for similar food. The free food was then presented while subjects were pressing on several reinforcement schedules. Subjects continued to press for reinforcement when one or two presses were required for reinforcement, and ate little free food. When ten presses were required for reinforcement, rats preferred free food and pressed little or not at all. It was concluded that, when work demands are not too high, rats prefer earned food to free food.
Overview
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Integrity signals
Registry
Cites
Statistics
Verification
Claims the paper makes
The claims and statistics of this paper haven’t been checked yet.
Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.
Self-check
Percentages, sums and reported differences re-computed from the paper’s own numbers.
The self-check needs the paper’s full text.
Citations
Cited by
Emerson, R. M. (1976) · Annual Review of Sociology · doi:10.1146/annurev.so.02.080176.002003 · Cited by 3,457
Value from hedonic experience and engagement
Higgins, E. T. (2006) · Psychological Review · doi:10.1037/0033-295x.113.3.439 · Cited by 949
Schulz, R. (1976) · Journal of Personality and Social Psychology · doi:10.1037/0022-3514.33.5.563 · Cited by 522
Animal domestication and behavior
(2002) · doi:10.1079/9780851995977.0000 · Cited by 288
A hypothesis of the co-evolution of cooperation and responses to inequity
Brosnan, S. F. (2011) · Frontiers in Neuroscience · doi:10.3389/fnins.2011.00043 · Cited by 134
Metadata
- Authors
- Carder, B., & Berkowitz, K.
- Venue
- Science
- Published
- 1970-02-27
- Volume
- 167
- Issue
- 3922
- Pages
- 1273-1274
- ISSN
- 0036-8075 (ISSN-L)
- 1095-9203
- OpenAlex
- W2041413833
- Cited by
- 178
- References
- 0
- FWCI
- 12.08
- Type
- journal article
- Language
- en
- Open access
- closed
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
Are you an author, or do you see a problem with this page? Request a review
How to cite
Cite CoChat for the checks on this page, and the paper for its own findings.
- This page
- CoChat. (2026). Citation check: Rats' Preference for Earned in Comparison with Free Food. https://app.cochat.ai/papers/10.1126/science.167.3922.1273
- The paper
- Carder, B., & Berkowitz, K. (1970). Rats' Preference for Earned in Comparison with Free Food. Science. https://doi.org/10.1126/science.167.3922.1273
Data sources
Bibliographic data: Semantic Scholar, OpenAlex, Crossref.
Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
