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Definition of Habituation:
- Habituation is defined as a decrease in responding to repeated stimuli that are harmless.
- Example: Tuning out the chimes from the CNU bell tower.

Learning Perspective:
- Habituation is viewed as a form of learning.
Occurrence Across Species:
- This phenomenon occurs in most species, from small organisms to large ones.
Reappearance of Responses:
- Habituated responses can reappear under certain conditions, indicating a flexible learning process.
- Terms:
- Spontaneous Recovery: The reappearance of a habituated response after a period without exposure to the stimulus.
- Dishabituation: The restoration of a response following the presentation of a novel or significant stimulus.
Forms of Habituation:
- Habituation can be categorized into short-term and long-term forms of learning.
Training Methods:
- Spaced training produces longer-term habituation compared to massed training; spaced training allows for better retention.
- Massed training results in more rapid habituation but only provides short-term effects.

Laboratory Contexts:
- Habituation has been studied in various contexts:
- Sea slug somatosensation
- Adult human taste
- Infant human vision
- Rodent audition

Touch Trials:
- Various trials involve touching the siphon of the sea slug.
- Trial 1: Measured response (gill contraction) after the first touch.
- Trial 6 and 13: Exhibited progressive habituation with each trial, reflected by reduced gill contraction.
- Trial 14: Involves eliciting a response after an arousal-inducing shock (tail shock) followed by touch.

Specificity of Habituation:
- The habituation response is specific to the type of stimulus encountered.
- Example: If a lemon is given on Trial 12, then dishabituation is likely to occur; the individual might respond again due to the new stimulus.

Infants and Attention Span:
- Infants demonstrate longer attention spans towards interesting stimuli, indicating they can habituate to both boring and intriguing visual inputs.

Methodology:
- The study involves a preference test phase, observing novelty versus familiarity in infants as a measure of habituation.

Training Approaches:
- Spaced Training: One loud tone presented daily, leading to a measured startle response.
- Massed Training: Loud tone presented every 3 seconds, likely leading to quicker habituation but shorter retention.

Definition of Sensitization:
- Sensitization is the process where exposure to an arousing stimulus increases the response to that stimulus and/or other related stimuli.
- Example: An irritating laugh can become increasingly annoying due to sensitization processes, indicative of a heightened state of arousal.

Learning Perspective:
- Sensitization is also viewed as a form of learning akin to habituation but operates on different stimuli.
Broad Applicability:
- This process occurs in various species and can manifest even after single stimulus exposure.
Duration:
- Sensitization can be short-term or long-term, often described as acute versus chronic arousal.
Less Specificity:
- Compared to habituation, sensitization is less stimulus-specific and tends to generalize to various responses.

Human Audio-Visual Response:
- Example of a startle response test in relation to audio-visual stimuli, possibly indicating a physiological reaction that might correlate with behavioral outcomes such as predicting suicide risk.

Response Mechanisms:
- Measures taken after loud noise contexts (60 dB as “quiet,” 80 dB as “loud”) followed by a very loud noise (110 dB) tested for startle responses.

Disorders Associated with Sensitization:
- PTSD, Anxiety, Depression are linked to enhanced responses to stressors, showing lowered response thresholds.
- Example: Individuals might display unusual sensitivity to psychostimulants after consistent exposure (e.g., one injection every 3 to 4 days).

Stimulus Nature:
- Typically involves harmless stimuli.
Response Dynamics:
- Characterized by decreased responding to repeated exposure.
Trial Development:
- Develops over multiple trials leading to stimulus-specific outcomes.
System Used:
- Works through an S-R (Stimulus-Response) System.

Stimulus Nature:
- Typically involves arousing stimuli.
Response Dynamics:
- Involves increased responding, potentially after a single exposure.
Specificity:
- Less specific, with responses generalizing across stimuli.
System Used:
- Involves a State System connected to arousal levels.

Separate Processes:
- It is assumed that different biological processes are responsible for habituation and sensitization responses.
Mutual Exclusivity:
- Habituation and sensitization are not mutually exclusive; behavioral effects are seen as a combination of both processes.
- Model Representation:
- Observed Behavioral Effect = [State] + (S-R) [State] + (S-R)

Checkerboard Example:
- 4 x 4 checkerboard: Lower state of arousal, leading to weakened S-R response.
- 12 x 12 checkerboard: Higher state of arousal, but also weakens with repeated training leading to different outcomes in S-R responses.

Mechanism of Dishabituation:
- The introduction of a lemon activates both the S-R system and State System.
- Training Effect:
- The S pathway to salivation weakens over training, and arousal levels decline.
- Trial Impact:
- If a lemon is introduced on Trial 12, dishabituation may ensue due to the activation of both systems, demonstrating how the dual process theory can explain observable behavior.