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What is Conditioned Stimulus (CS)? A conditioned stimulus (CS) is one of the key terms used in classical conditioning, others include conditioned response, neutral stimulus, unconditioned stimulus, and unconditioned response. In classical conditioning, a conditioned stimulus (CS) is a once-neutral stimulus or event that gains meaning and significance through repeated association with another meaningful stimulus. It starts off as something that doesn't hold any particular value or elicit a response. However, through consistent pairing with an unconditioned stimulus that naturally evokes a response, it gradually acquires the ability to trigger a conditioned response on its own. For example, the sound of a leave bell may initially mean nothing to students, but after being consistently paired with the joy of recess, it becomes a signal that signifies freedom and prompts the students to leave the classroom eagerly. This process of learning and association, discovered by Ivan Pavlov, helps organisms respond to certain cues based on their learned connections with other stimuli. Examples of Conditioned Stimulus Let's look at some of the examples of conditioned stimulus in classical conditioning, including how it is illustrated in the theory and real-life examples. Pavlov's Classical Conditioning In Pavlov's classical conditioning, the conditioned stimulus is like a secret code that gains meaning through repeated associations. Imagine a dog who hears a bell (the neutral stimulus) before being given food (the meaningful stimulus). Eventually, the dog learns that the bell predicts food and starts salivating (the conditioned response) at the sound of the bell alone. Pavlov explained that the neutral stimulus becomes a conditioned stimulus by forming a strong connection with the meaningful stimulus. It's like the bell saying, "Hey, food is coming!" and causing the dog to respond automatically. Related: Conditioned Response in Classical Conditioning: Definition and Examples Little Albert (Watson & Raynor) Experiment In the famous Little Albert experiment conducted by Watson and Raynor, the conditioned stimulus played a crucial role in shaping a fear response. Little Albert, a child, initially showed no fear towards a white rat (the neutral stimulus). However, whenever the rat was presented, a loud noise (a meaningful stimulus) was produced, causing Albert to startle and feel scared. Eventually, Albert associated the rat with the loud noise, and the rat alone became a conditioned stimulus that triggered fear in him. Watson explained that the neutral stimulus (rat) became a conditioned stimulus by being consistently paired with a meaningful stimulus (loud noise), leading to a learned fear response. The School Bell Imagine the school bell, a seemingly ordinary sound that holds the power to unleash a flurry of excitement and action. Initially, the bell itself may not carry any inherent significance. However, through repeated associations with the joyful prospect of recess or the end of a class, it becomes a conditioned stimulus. As students eagerly anticipate the bell's ring, it acts as a trigger for their automatic response to leave the classroom and embrace their well-deserved freedom. The school bell, once neutral, transforms into a symbol of liberation, embodying the learned connection between its sound and the exhilarating experiences that lie ahead. Related: Unconditioned Response in Classical Conditioning: Definition and Examples The Hotel Bell When entering a hotel, the subtle chime of the bell resonates with a promise of attentive service. Initially, the bell is a neutral stimulus, holding no inherent meaning. However, through repeated associations with the arrival of hotel staff and the anticipation of assistance, it becomes a conditioned stimulus. The familiar sound triggers an automatic response in guests, signaling their expectation of personalized attention and hospitality. As the bell echoes through the lobby, a sense of comfort washes over guests, a reminder that their needs will be met and their desires catered to, creating an ambiance of warm and inviting service. How Neutral Stimulus Becomes A Conditioned Stimulus? In Pavlov's classical conditioning, an ordinary and meaningless stimulus embarks on a remarkable journey. By pairing the neutral stimulus with a meaningful one repeatedly, a profound change occurs. Over time, the neutral stimulus begins to evoke a response previously associated only with the meaningful stimulus. This newfound power is witnessed when the neutral stimulus alone triggers the same response. For instance, imagine a bell (neutral stimulus) paired with food (meaningful stimulus). Eventually, the bell alone elicits salivation (conditioned response), as it has become a conditioned stimulus, bearing the weight of its learned association with food. Difference Between Conditioned Stimulus and Unconditioned Stimulus In classical conditioning, two key players emerge the conditioned stimulus (CS) and the unconditioned stimulus (US). Their roles are distinct yet intertwined. The unconditioned stimulus possesses inherent meaning, automatically triggering a natural response, while the conditioned stimulus initially lacks significance but gains it through repeated pairings with the unconditioned stimulus. Pavlov defined the unconditioned stimulus as an innate trigger, like food, while the conditioned stimulus is a learned cue, like a bell. Through association, the conditioned stimulus comes to elicit a response, mimicking the original response to the unconditioned stimulus. References: Clark, R. E. (2004). The classical origins of Pavlov’s conditioning. Integrative Physiological & Behavioral Science, 39 (4), 279-294. Published online October 2004:279-294. doi:10.1007/bf02734167 Pavlov, I. P. (1927). Conditioned Reflexes: An Investigation of the Physiological Activity of the Cerebral Cortex. Translated and edited by Anrep, GV (Oxford University Press, London, 1927). Mallot R, Shane JT. Principles of Behavior: Seventh Edition. Psychology Press. 2015.