Lecture Notes: Social Psychology 204 — Introduction and Bystander Effect
Course Overview and Personnel
This lecture is for Psych 204 (Social Psychology) at the University of Auckland. The speaker is Brian Dawn, the first lecturer for Psychology 204 in Semester 2. He introduces the course, noting that the course coordinator is Chris Sibley and that Eden Clark will act as a head tutor. Dawn emphasizes that he will provide an introduction today but not the official admin details. He promises to dive into content early to give students a sense of the subject before covering administrative matters.
Dawn outlines the plan for today: instead of starting with dull admin material, they will watch a video on the Bystander Effect to ground students in social psychology concepts. He invites students to consider why people help or do not help in emergencies, what factors influence helping, and what they would do in such a situation. The video depicts the diffusion of responsibility in a real-world crowd setting and uses actors to demonstrate varying responses.
The Bystander Effect: Video Summary and Key Concepts
The video features a staged emergency on a busy London street (Liverpool Street Station) with an actor (Peter) feigning illness. A key finding shown is that in crowded situations, victims often receive less help, a phenomenon psychologists attribute to diffusion of responsibility: as the number of bystanders increases, the perceived personal responsibility to intervene decreases.
Two key “rules” emerge for bystanders: (1) the norm to help, and (2) the norm to follow what others are doing. In crowds, the latter often prevails, leading to inaction. The video demonstrates the social dynamics: when Ruth (another actor) takes Peter’s place, 34 people pass by before someone intervenes, illustrating how the presence of others can inhibit action. The experiment also shows how appearances (dress, perceived status) and social cues influence who is more or less likely to receive help. When Peter is dressed as a respectable gentleman, intervention happens more quickly (e.g., six seconds) and a bystander even asks him if he’s okay and calls him “sir.” This demonstrates how social context and perceived legitimacy of the person in need can affect helping behavior.
The session emphasizes that helping behavior is a product of the interaction between the individual in need, potential helpers, and the situational context. The facilitator highlights that researchers can manipulate factors in the environment to influence helping behavior, illustrating the scientific method in action.
Learning Outcomes and Course Norms
At the start of each lecture, Dawn presents learning outcomes. For this lecture, the outcomes are:
Define what social psychology is.
Explain how social psychology differs from related fields.
Explain why social psychology is distinct from common sense.
He stresses that social psychology focuses on how people think, feel, and behave in the presence of real or imagined others, covering cognitions, emotions, and behaviors. He also emphasizes the idea of imagined presence (e.g., attachment) shaping thoughts and actions even when others are not physically present. He notes the scientific method as central to social psychology, including how we manipulate, observe, and measure variables to test theories.
Dawn introduces the course structure: multiple lecturers (himself, Chris Sibley, Eden Clark, Nikola Overall, Shiloh) will cover different topics, with Dawn focusing on attraction, intimacy, and self-expansion in early close relationships, while Nicola Overall covers later stages of close relationships. He invites active participation, discourages disruptive technology use, and asks students to be on time to create a respectful, non-distracting learning environment.
Social Psychology: Definition and Scope
Dawn provides a working definition:
He highlights the distinction between the actual presence of others and imagined presence, giving examples such as how attachment (early life relationships) shapes later interactions without ongoing parental presence. The course will cover how social influence operates through peers and relationships, and how social contexts affect thinking, emotions, and behavior.
The session underscores the methodological backbone of social psychology: the scientific study uses systematic manipulation, observation, and measurement to derive theories and test them with data. Dawn notes that the field examines how people can change their thoughts and behaviors under social influence, with concrete demonstrations like the bystander video illustrating these principles.
The Scientific Method in Social Psychology
The video example of bystander intervention is used to illustrate how social psychology uses the scientific method: manipulating variables (e.g., dress, group presence) and observing how helping behavior changes. The idea is not just to rely on intuition or anecdote but to conduct controlled observations and tests that reveal causal relations.
Dawn discusses how social psychology covers a broad range of topics such as attraction, intimacy, and self-expansion, and how findings from studies often come from Western, educated, industrialized, rich, and democratic (WEIRD) populations. He stresses the importance of cross-cultural research and acknowledges the need to diversify research samples to improve generalizability.
Classic Studies: Debates, Dress, and Social Context
Dawn walks through a pair of illustrative, culture-relevant examples to show social influence and context effects:
Bystander video (diffusion of responsibility): People are less likely to help when others are present; helping increases when someone begins to intervene.
Reagan debate study (a hypothetical classroom study): Participants watched three versions of a 1984 U.S. presidential debate with different levels of social context (unedited; jokes present with no audience reaction; none of the jokes or audience reaction). The dependent variable was how much participants liked Reagan. The results showed that keeping jokes but removing audience reaction increased negative judgments, while removing jokes and audience reaction lowered influence, illustrating that our interpretation of others is shaped by social context and reactions. The takeaway is that our perceptions of others are socially constructed and context-dependent.
Dawn then moves to a second example: School achievement and gender in STEM. He describes a study in Canada with first-year engineering students that tested an intervention designed to enhance belonging for women in STEM. The intervention successfully increased belonging for all students, but the key finding is a gender-specific effect on achievement: women who received belonging affirmation showed significant improvements in GPA (out of 100) and self-esteem/coping, whereas men showed little to no change. This is illustrated with a figure using bars to compare GPA by intervention vs. no intervention for men (blue bars) and women (other bars). The implication is that social context and belonging can significantly influence academic outcomes, especially for underrepresented groups.
Dawn notes that in both cases, social context shapes thoughts, feelings, and behaviors, and that belonging can act as a lever to improve performance and well-being. He also points to ongoing work in New Zealand examining the experiences of Modi and Pacific staff and students, highlighting local relevance of belonging and marginalization on campus.
Culture, Context, and Cross-Cultural Relevance
Dawn emphasizes that much of psychology, including social psychology, has historically relied on WEIRD samples, which raises concerns about generalizability to other cultures. He argues for expanding research to diverse contexts to understand how culture shapes cognition, emotion, and behavior. He uses the broader rationale that different cultural backgrounds (e.g., numerical cognition in some South American communities) can lead to different resource allocation and social behavior, underscoring the need for global assessments of psychological phenomena.
Distinctions from Related Fields: Sociology and Clinical Psychology
Dawn differentiates social psychology from sociology and clinical psychology:
Sociology focuses on groups, institutions, social structures, and broad societal patterns. It asks questions like whether one country has higher aggression levels than another and investigates macro-level processes.
Social psychology focuses on the individual in social contexts, asking how situational factors and social influences shape thoughts, feelings, and behaviors at the individual level. Examples include how a crowd or group norms influence an individual's likelihood to help or to become aggressive.
Clinical psychology studies mental health challenges and psychopathology, focusing on clinical populations and intervention strategies. While emotions studied in social psychology are relevant to clinical contexts, clinical psychology is concerned with diagnosing and treating mental health disorders, whereas social psychology emphasizes universal properties of human behavior in the general population.
Dawn notes that the two fields intersect in their interest in emotions and social influence, and he promises to return to the intersections of clinical and social psychology in a future session.
Belonging, Real-World Relevance, and NZ Context
A practical thread in the talk is the role of belonging in academic success and well-being. The Canada-based intervention study shows that belonging affirmations can impact GPA and self-esteem, especially for women in STEM fields. Dawn ties this to New Zealand context by referencing local research on the experiences of Modi and Pacific students and staff, pointing to ongoing concerns about belonging and representation on campuses. He frames belonging as both a problem and a solution: if belonging is lacking, interventions to foster belonging can yield meaningful improvements in engagement and achievement.
Classroom Practice and Engagement Philosophy
Dawn explains the classroom practice: he encourages students to actively participate and to discuss with neighbors during the session. He asks students to answer questions derived from the video about helping behavior and factors that influence it. He also mentions that he will periodically engage with students in the crowd to model engagement and to build a more connected classroom environment. He stresses the importance of respectful behavior, non-disruptive use of technology, and punctuality to minimize distractions.
Practical Implications and Real-World Relevance
Across the lecture, several practical themes emerge:
Understanding diffusion of responsibility helps explain why crowds can fail to intervene in emergencies and highlights the importance of taking personal responsibility in critical moments.
The appearance and social cues of a person in need can influence the likelihood of intervention, underscoring how social perception and stigma can shape helping behavior.
Belonging in educational contexts significantly affects performance, particularly for underrepresented groups, suggesting that university policies and practices should prioritize inclusive environments and belonging interventions.
Cross-cultural awareness is essential for generalizing findings beyond WEIRD populations and for understanding how social dynamics operate in diverse settings.
Q&A and Miscellaneous Observations
The instructor and students engage in informal dialogue about course logistics, reading assignments, and potential career interests (e.g., clinical/couples therapy and healthy relationship dynamics). The conversation also touches on questions about how readings link to lectures, the role of postgrad teaching, and the teaching style of other faculty members (e.g., Nicole Overall, Chris Sibley, and Danny). There is an emphasis on finding mentors, exploring different sections of the course, and assessing how theoretical concepts (like attraction and intimacy) connect to real-world relationship dynamics. The session ends with a sense of ongoing exploration and anticipation for future lectures (e.g., Thursday’s session on clinical and social psychology intersections).