Intro to Behavior, Ethograms, and Brain Lesion Techniques

Practice vocabulary flashcards covering concepts of animal behavior, ethogram sampling methods, surgical lesions and ablations, classic neuroanatomy lesion outcomes, and behavioral paradigms like the open field, spatial alternation task, and radial-arm maze.

Ethology

The scientific study of animal behavior, particularly focusing on behaviors that occur naturally in the environment.

Ethogram

A comprehensive list, catalog, or inventory of an animal's behaviors (including actions, movements, and patterns) providing an objective, quantitative description of normal baseline behavior.

Focal-Animal Sampling

An ethological sampling method in which an observer records all the actions of a single individual animal for a specific period of time.

Instantaneous Sampling

A behavioral sampling method where an observer records the behavior of one individual at predetermined, regular intervals (for example, recording what behavior is occurring every minute for $10\,\text{min}$).

Continuous Sampling

An observational recording technique where an observer records all behaviors occurring throughout the entire duration of the observation period.

Scan Sampling

A behavioral sampling method where an observer rapidly scans an entire group and records the behavior of all individuals at fixed time intervals.

Sequence Sampling

An observational technique that focuses on recording interactions between animals rather than individual actions, starting when an interaction begins and stopping when it ends to analyze how one behavior leads to another.

Ablation

The surgical removal or targeted destruction of biological tissue or cells in order to determine what function that structure supported by comparing pre- and post-removal behavior.

Lesion

An area of damaged or abnormal tissue in the brain that tends to be more precise than an ablation; it can be naturally occurring (e.g., strokes, injury, disease) or experimentally induced (e.g., chemical, electrical).

Sham Surgery

A control surgical procedure in which an animal undergoes identical anesthesia, incision, and exposure steps as experimental subjects without actual removal or destruction of the target brain tissue.

Sham Rage

An extreme, uninhibited aggressive display produced in cats following the surgical removal of the neocortex.

Kluver Bucy Syndrome

A neurobehavioral condition caused by bilateral removal of the amygdala, characterized by marked alterations in emotional and social behaviors.

Decerebrate Rigidity

A state of severe, involuntary extensor muscle stiffness and posturing resulting from a brainstem transection.

Lateral Hypothalamus (Lesion Effect)

Damage to this hypothalamic region causes rats to completely stop eating and drinking (aphagia and adipsia) and exhibit decreased aggression.

Ventromedial Hypothalamus (Lesion Effect)

Damage or ablation to this hypothalamic structure leads to hyperphagia (excessive eating) in rats.

Suprachiasmatic Nucleus (Lesion Effect)

Destruction of this master biological clock region of the hypothalamus leads to severely disrupted circadian and sleep-wake cycles.

Preoptic Area (POA) (Lesion Effect)

Bilateral damage to this hypothalamic area causes rats to lose the physiological ability to regulate internal body temperature.

Open Field Test

A behavioral assay used to assess locomotor activity, anxiety-like behavior, and exploratory tendencies in an animal placed inside a novel, enclosed arena.

Spatial Alternation Task

A behavioral test typically conducted in a T-maze that assesses short-term spatial working memory by measuring an animal's ability to recall which arm it entered on a forced trial and choose the opposite arm on a choice trial.

Radial Arm Maze

An eight-arm maze apparatus and paradigm designed to evaluate spatial learning and memory (working and reference memory) by measuring an animal's ability to navigate multiple arms for food rewards without repeating entries into already visited arms.

Mass Action

A neuropsychological theory proposing that the degree of behavioral deficit following cortical damage is determined by the total volume of brain tissue destroyed rather than the specific locus of the lesion.

Specific Projection Hypothesis

An alternative model to mass action suggesting that behavioral deficits stem from disruption to specific neural pathways and projection systems (such as those connected to the mediodorsal thalamic nucleus) rather than lesion volume alone.