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Articles 1 - 7 of 7
Full-Text Articles in Medicine and Health Sciences
Relative Reward Effects On Operant Behavior: Incentive Contrast,Induction And Variety Effects, Howard Cromwell
Relative Reward Effects On Operant Behavior: Incentive Contrast,Induction And Variety Effects, Howard Cromwell
Howard Casey Cromwell
Comparing different rewards automatically produces dynamic relative outcome effects on behavior. Eachnew outcome exposure is to an updated version evaluated relative to alternatives. Relative reward effectsinclude incentive contrast, positive induction and variety effects. The present study utilized a novelbehavioral design to examine relative reward effects on a chain of operant behavior using auditory cues.Incentive contrast is the most often examined effect and focuses on increases or decreases in behavioralperformance after value upshifts (positive) or downshifts (negative) relative to another outcome. Weexamined the impact of comparing two reward outcomes in a repeated measures design with three ses-sions: a single outcome and …
Selective Breeding For 50 Khz Ultrasonic Vocalization Emission Produces, Howard Cromwell
Selective Breeding For 50 Khz Ultrasonic Vocalization Emission Produces, Howard Cromwell
Howard Casey Cromwell
Ultrasonic vocalizations (USVs) are emitted by rodents and can signal either negative or positive affective states in social and nonsocial contexts. Our recent work has utilized selective breeding based upon the emission of 50 kHz USVs in response to standard cross species hand play—namely experimenters ‘tickling’ rats. Previous work has shown that high-tickle responsive animals (i.e., rats emitting abundant 50 kHz USVs) are gregarious and express enhanced positive emotional behaviors relative to animals exhibiting low 50 kHz USVs. The present study extends this work by examining the developmental profile of play behavior and the suppression of play behavior by predator …
Rethinking Thecognitiverevolutionfromaneuralperspective:How, Howard Cromwell
Rethinking Thecognitiverevolutionfromaneuralperspective:How, Howard Cromwell
Howard Casey Cromwell
Words such as cognition, motivation and emotion powerfully guide theory development and the overall aims and goals of behavioral neuroscience research. Once such concepts are accepted generally as natural aspects of the brain, their influence can be pervasive and long lasting. Importantly, the choice of conceptual terms used to describe and study mental/neural functions can also constrain research by forcing the results into seemingly useful ‘conceptual’ categories that have no discrete reality in the brain. Since the popularly named ‘cognitive revolution’ in psychological science came to fruition in the early 1970s, the term cognitive or cognition has been perhaps the …
Reduction Of Prelimbic Inhibitory Gating Of Auditory Evoked Potentials After Fear Conditioning, Howard Cromwell
Reduction Of Prelimbic Inhibitory Gating Of Auditory Evoked Potentials After Fear Conditioning, Howard Cromwell
Howard Casey Cromwell
Inhibitory gating (IG) is a basic central nervous system process for filtering repetitive sensory information. Although IG deficits coincide with cognitive and emotional dysfunction in a variety of neuropsychiatric disorders, limited research has been completed on the basic, functional nature of IG. Persistent IG occurs in rat prelimbic medial prefrontal cortex (mPFC), a crucial site for modulating emotional learning. To investigate the interaction of affect and IG, we recorded local field potentials (LFP) directly from prelimbic mPFC and examined the influence of tone-shock fear conditioning (FC) on IG. Behavioral reactions during IG were observed before and after FC, and increase …
Single Unit And Population Responses During Inhibitory Gating Of Striatal Activity In Freely Moving Rats, Howard C. Cromwell
Single Unit And Population Responses During Inhibitory Gating Of Striatal Activity In Freely Moving Rats, Howard C. Cromwell
Howard Casey Cromwell
Abstract—The striatum is thought to be an essential region for integrating diverse information in the brain. Rapid inhibitory gating (IG) of sensory input is most likely an early factor necessary for appropriate integration to be completed. Gating is currently evaluated in clinical settings and is dramatically altered in a variety of psychiatric illnesses. Basic neuroscience research using animals has revealed specific neural sites involved in IG including the hippocampus, thalamus, brainstem, amygdala and medial prefrontal cortex. The present study investigated local IG in the basal ganglia structure of the striatum using chronic recording microwires. We obtained both single unit activations …
Auditory Inhibitory Gating In Medial Prefrontal Cortex: Single Unit And Local Field Potential Analysis, Howard C. Cromwell
Auditory Inhibitory Gating In Medial Prefrontal Cortex: Single Unit And Local Field Potential Analysis, Howard C. Cromwell
Howard Casey Cromwell
Medial prefrontal cortex is a crucial region involved in inhibitory processes. Damage to the medial prefrontal cortex can lead to loss of normal inhibitory control over motor, sensory, emotional and cognitive functions. The goal of the present study was to examine the basic properties of inhibitory gating in this brain region in rats. Inhibitory gating has recently been proposed as a neurophysiological assay for sensory filters in higher brain regions that potentially enable or disable information throughput. This perspective has important clinical relevance due to the findings that gating is dramatically impaired in individuals with emotional and cognitive impairments (i.e. …
Relative Reward Processing In Primate Striatum, Howard C. Cromwell
Relative Reward Processing In Primate Striatum, Howard C. Cromwell
Howard Casey Cromwell
Rewards are often not only valued according to their physical characteristics but also relative to other available rewards. The striatum (caudate nucleus, putamen, ventral striatum including nucleus accumbens) is involved in the organization of movement and the processing of reward information. We studied the activity of single striatal neurons in macaques that were presented with different combinations of two rewards. We found in nearly half of the investigated neurons that the processing for one reward shifted, relative to the other rewards that were available in a given trial block. The relative reward processing concerned all forms of striatal activity related …