Shirley L. Buchanan

Wm. Jennings Bryan Dorn VA Medical Center

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D. A. Powell

Wm. Jennings Bryan Dorn VA Medical Center

Linda L. Hernández

University of South Carolina

Dorie Tebbutt

Mark E. Chachich

Towson University

Richard H. Thompson

British Heart Foundation

Virginia Murphy

Grampians Health

Richard H. Thompson

Wheelock College

James Penney

Trent University

Sheryl R. Ginn

Rowan-Cabarrus Community College

Joselyn McLaughlin

Rutgers New Jersey Medical School

Cooperative Institutions

University of South Carolina

Wm. Jennings Bryan Dorn VA Medical Center

Veterans Health Administration

Johns Hopkins University

United States Department of Veterans Affairs

Medical University of South Carolina

Columbia VA Health Care System

Behavioral Pharma (United States)

Grampians Health

Ballarat Health Services

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Research Field

Divergencies in Pavlovian conditioned heart rate and eyeblink responses produced by hippocampectomy in the rabbit (Oryctolagus cuniculus)

Behavioral and Neural Biology (1980)

Shirley L. Buchanan D. A. Powell

Eyeblink conditioning

10.1016/s0163-1047(80)90839-0

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Citations (49)

Cingulate damage attenuates conditioned bradycardia

Neuroscience Letters (1982)

Shirley L. Buchanan D. A. Powell

Neocortex

Stimulus (psychology)

Cortical neurons

10.1016/0304-3940(82)90327-5

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Citations (41)

Intracerebral scopolamine administration attenuates Pavlovian heart rate conditioning in the rabbit

Pavlovian Journal of Biological Science (1985)

D. A. Powell Shirley L. Buchanan Linda L. Hernández

Scopolamine Hydrobromide

Scopolamine

10.1007/bf03003594

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Citations (9)

Midline thalamic lesions enhance conditioned bradycardia and the cardiac orienting reflex in rabbits

Psychobiology (1989)

Shirley L. Buchanan Richard H. Thompson D. A. Powell

Learned heart rate changes were assessed during two sessions of differential Pavlovian (classical) conditioning in three groups of New Zealand albino rabbits. One group received ibotenic acid lesions of the midline nuclei of the thalamus, a second received vehicle injections in the midline nuclei, and a third group served as unoperated control animals. During an initial session, the cardiac component of the orienting reflex was assessed in all three groups. The rabbits with lesions of midline thalamic nuclei demonstrated enhanced bradycardiac conditioned responses, relative to either vehicle-control or unoperated animals. The heart rate component of the orienting response to nonreinforced tones, which also consisted of stimulus-evoked bradycardia, was likewise larger in lesioned animals. These results suggest that the midline thalamic nuclei, like the interconnected mediodorsal thalamic nucleus, may be involved in the regulation of sympathetically mediated autonomic adjustments.

Ibotenic acid

Orienting response

Stimulus (psychology)

Reflex bradycardia

10.1007/bf03337784

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Citations (24)

Mediodorsal thalamic lesions and Pavlovian conditioning of heart rate and eyeblink responses in the rabbit.

Behavioral Neuroscience (1990)

Shirley L. Buchanan Richard H. Thompson

Eyeblink conditioning

10.1037/0735-7044.104.6.912

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Citations (23)

Intraseptal scopolamine has differential effects on Pavlovian eye blink and heart rate conditioning.

Behavioral Neuroscience (1985)

D. A. Powell Linda L. Hernández Shirley L. Buchanan

The effects of intraseptal scopolamine hydrobromide injections on Pavlovian (classical) conditioning were evaluated, with tones used as the conditioned stimulus (CS) and a periorbital electric shock train as the unconditioned stimulus (UCS). Eye blink (EB) and heart rate (HR) conditioned responses were concomitantly recorded. Although injections of scopolamine into the medial septum impaired the acquisition of the Pavlovian conditioned eyelid reflex, these injections enhanced the magnitude of accompanying Pavlovian conditioned HR decelerations. However, scopolamine applied to the lateral septal area had no effect on EB conditioning, relative to the vehicle, but, like medial injections, enhanced the magnitude of the accompanying HR decelerations. These results are compatible with those of previous investigations: Medial septal dysfunction impairs somatomotor conditioning but leaves autonomic conditioning intact, and septal dysfunction produces a parasympathetic bias of the cardiovascular system.

Scopolamine Hydrobromide

Stimulus (psychology)

10.1037/0735-7044.99.1.75

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Citations (21)

Intraseptal scopolamine has differential effects on Pavlovian eye blink and heart rate conditioning.

Behavioral Neuroscience (1985)

D. A. Powell Linda L. Hernández Shirley L. Buchanan

Scopolamine

10.1037//0735-7044.99.1.75

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Citations (1)

Mediodorsal thalamic lesions and Pavlovian conditioning of heart rate and eyeblink responses in the rabbit.

Behavioral Neuroscience (1990)

Shirley L. Buchanan Richard H. Thompson

Rabbits received ibotenic acid lesions of the mediodorsal nucleus of the thalamus (MD) or sham lesions. These animals were compared on 4 sessions of Pavlovian eyeblink and heart rate conditioning, in which a tone was the conditioned stimulus and a paraorbital electrical shock was the unconditioned stimulus. Lesions of MD retarded acquisition of the eyeblink conditioned response and abolished the late-occurring tachycardiac component of the heart rate conditioned response. The data are compatible with previous experiments suggesting that MD participates in the sympathetic control associated with somatomotor learning.

Ibotenic acid

Eyeblink conditioning

Associative learning

Stimulus (psychology)

Neutral stimulus

Conditioned response

10.1037//0735-7044.104.6.912

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Citations (28)

Lesions of the thalamic reticular nucleus or the basal forebrain impair Pavlovian eyeblink conditioning and attenuate learning-related multiple-unit activity in the mediodorsal nucleus of the thalamus

Psychobiology (1997)

Shirley L. Buchanan Francis M. Beylotte D. A. Powell

Rabbits received ibotenic acid lesions of the thalamic reticular nucleus or the basal forebrain, or sham lesions, and had multiple-unit recording electrodes implanted in the mediodorsal nucleus of the thalamus (MD). Animals were compared on four sessions of simple Pavlovian conditioning using a tone conditioned stimulus (CS) and periorbital electric shock unconditioned stimulus (US). Eyeblink (EB) and heart rate (HR) responses were recorded, as well as multiple-unit activity (MUA) from MD. MD MUA in sham-lesioned animals showed small but consistent increases in response to the CS. Lesions of either the basal forebrain or the thalamic reticular nucleus decreased the magnitude of the MUA changes recorded from MD and impaired acquisition of the EB conditioned response (CR). Reticular nucleus, but not basal forebrain, lesions slightly enhanced the magnitude of the HR CR. Since MD’s efferent projections are to the prefrontal cortex, these results support the idea that MD, possibly due to its forebrain-reticular afferent connections, may participate in a “response selection” function of the prefrontal cortex.

Caudate nucleus

Reticular connective tissue

Forebrain

Reticular activating system

10.3758/bf03327026

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Citations (2)

Concomitant heart rate and corneoretinal potential conditioning in the rabbit (Oryctolagus Cuniculus): Effects of caudate lesions

Physiology & Behavior (1978)

D. A. Powell Donald Mankowski Shirley L. Buchanan

Caudate nucleus

10.1016/0031-9384(78)90066-5

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Citations (72)