Note
Thesis (M.A.)--Florida Atlantic University, 1973.
Member of
Contributors
Publisher
Florida Atlantic University
Date Issued
1973
Description
Rats with bilateral, electrolytic, dorsal-hippocampal lesions
were compared with operated controls in a straight runway to assess
the effects of the lesion on the animals' reactions to food-incentive
shifts. Within each surgical group, half the animals received 40
preshift trials with low reward while the other half received the same
number of trials with high reward, following this all Ss were shifted
to the opposite reward magnitude and received 40 additional trials.
At this point, the Ss were shifted back to original reward magnitudes
for another 40 trials. Finally, all Ss underwent experimental
extinction. The data failed to support the hypothesis that dorsal
hippocampal rats "overreact" to incentive shifts. Lesion animals, as
compared to controls, were less sensitive to the reward shifts and
showed more resistance to extinction. The results suggest that the
lesion produces a deficit in the Ss ability to vary behavior specially
on tasks that require response decrements. However, the lesion-produced
hyperactivity introduced confounding aspects to this interpretation.
were compared with operated controls in a straight runway to assess
the effects of the lesion on the animals' reactions to food-incentive
shifts. Within each surgical group, half the animals received 40
preshift trials with low reward while the other half received the same
number of trials with high reward, following this all Ss were shifted
to the opposite reward magnitude and received 40 additional trials.
At this point, the Ss were shifted back to original reward magnitudes
for another 40 trials. Finally, all Ss underwent experimental
extinction. The data failed to support the hypothesis that dorsal
hippocampal rats "overreact" to incentive shifts. Lesion animals, as
compared to controls, were less sensitive to the reward shifts and
showed more resistance to extinction. The results suggest that the
lesion produces a deficit in the Ss ability to vary behavior specially
on tasks that require response decrements. However, the lesion-produced
hyperactivity introduced confounding aspects to this interpretation.
Language
Type
Form
Extent
83 p.
Subject (Topical)
Identifier
13539
Additional Information
Thesis (M.A.)--Florida Atlantic University, 1973.
Charles E. Schmidt College of Science
Date Backup
1973
Date Text
1973
Date Issued (EDTF)
1973
Extension
FAU
FAU
admin_unit="FAU01", ingest_id="ing1508", creator="staff:fcllz", creation_date="2007-07-19 01:14:24", modified_by="staff:fcllz", modification_date="2011-01-06 13:08:57"
IID
FADT13539
Issuance
monographic
Organizations
Attributed name: Florida Atlantic University
Person Preferred Name
NUNEZ, ANTONIO ALBERTO.
Graduate College
Physical Description
83 p.
application/pdf
Title Plain
DORSAL HIPPOCAMPAL LESIONS AND REWARD MAGNITUDE SHIFTS IN RATS
Use and Reproduction
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Origin Information
1973
monographic
Boca Raton, Fla.
Florida Atlantic University
Physical Location
Florida Atlantic University Libraries
Place
Boca Raton, Fla.
Sub Location
Digital Library
Title
DORSAL HIPPOCAMPAL LESIONS AND REWARD MAGNITUDE SHIFTS IN RATS
Other Title Info
DORSAL HIPPOCAMPAL LESIONS AND REWARD MAGNITUDE SHIFTS IN RATS