Noise. What is noise? Any type of sound Usually refer to loud or unpleasant sounds as “noise”

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Presentation transcript:

Noise

What is noise? Any type of sound Usually refer to loud or unpleasant sounds as “noise”

How is noise measured? Sound waves create pressure The amount of pressure relates to loudness Noise is measured in dB dB are measured on a logarithmic scale

How noise applies to psychology Affect and health Environmental noise can impact our health via stress, mood Behaviour Exposure to environmental noise can influence behaviour such as helping, aggression We cope with unwanted noise by changing our behaviour Cognition Noise perception can change depending on exposure length (adaptation) Noise can change how we learn or complete tasks

Sources of noise Outdoors – Airplanes, traffic, wind, animals, construction Indoors – Ventilation systems, neighbours, electronics, conversations

Video Things to consider: What are examples of the sources of environmental noise given in the video? How do people change their behaviour to cope with noise? What affect did noise have on some of the people interviewed?

Noise and health Wind farm opponents cheer federal study of health effects The Canadian Press Posted: Jul 11, :37 AM ET Last Updated: Jul 11, :57 PM ET

Hans Selye Selye was the pioneer in stress theory. Stress was defined as the nonspecific response of the body to any demands made upon it.

Noise and health What demands does noise put on the body? According to Selye’s General Adaptation Syndrome (GAS), noise can cause stress which leads to arousal in the body GAS model: Alarm (prepare to meet a threat), resistance (coping), exhaustion (physical resources are depleted)

Noise and health Think about how the GAS model applies to hearing a car alarm go off

Noise and health Increase in hypertension (high blood pressure) Increased consumption of medication Increased hospital admissions Increase in physician visits Increase in cardiovascular problems Increase in sleep problems Increase in mortality Lower birth weight babies Slower height and weight gains in children Hearing loss

Noise and health But can we psychologically adapt to the stress caused by noise? It appears so: Nivison, M.E. and Endresen, I.M. (1993) An analysis of the relationships among environmental noise, annoyance and sensitivity to noise and the consequences for health and sleep, J Behav Med, 16, eoliennes/summary-resume-eng.php eoliennes/summary-resume-eng.php Lazarus and Folkman (1984) model considers the psychological appraisal of stressors (harm, threat, challenge) Perception of stress, coping, vulnerability

Noise and behaviour What behaviours do we engage in to cope with environmental noise? Drown it out

Apple ’ s iPod Warning

Noise and behaviour What behaviours do we engage in to cope with environmental noise? Compensate

Noise and behaviour What behaviours do we engage in to cope with environmental noise? Design around it

Noise and behaviour How does noise change how we behave? We help less in environments with a high level of environmental noise (Page, 1977) The number of people who helped pick up dropped cards decreased in environments with more noise Noise Level% Helping 50 dB60 80 dB dB35

Noise and behaviour How does noise change how we behave? We help less in environments with a high level of environmental noise (Page, 1977) The type of help we provide may be related to sex Physical help offered Verbal help offered MaleFemaleMaleFemale Level of street noiseTotal % help offered 72 dB (normal)90 92 dB (construction)80

Noise and behaviour Similar results were found by Mathews and Canon (1975)

Noise and behaviour Possible Explanations for Less Aid Under Noisy Conditions Information overload may cause screening of inputs and a de-emphasis on needs of others Noise may function as a distractor Noise may prevent verbal communication, raising costs (efforts) of social interaction Production of negative affect and mood change: irritation, annoyance, unpleasantness Aversive quality of noise may lead to escape, reducing likelihood of assistance

Noise and cognition Environmental noise can impact how we learn, perceive, and process information This is especially true for children because They have better hearing than adults, but poorer listening skills They have immature attention mechanisms They require a higher signal: noise ratio They have weak frustration coping skills

Noise and cognition Adults may cope with noise by tuning their attention. That is, they attempt to focus only on relevant sensory input Children raised in noisy environments may not have the ability to tune out distractor noises or to identify appropriate vs. inappropriate sound cues This may lead to poor verbal and reading skills

Noise and cognition How does noise change how we learn? Children who learn in a noisy classroom perform worse on reading tasks relative to children in quieter classrooms (Bronzaft, 1981) Bronzaft measured reading achievement test scores at a school located 220 feet from an elevated train line— classes were disrupted every 4.5 minutes for a 30 second interval.

Noise and cognition Students on the noisy side did significantly poorer on the standardized reading test.

Noise and cognition After noise reduction (rubber rail mounts, acoustic ceilings), total noise decreased 6- 8dBA (train noise level = dBA) There were no significant reading test differences for quiet and noisy classrooms following the noise reduction interventions. Is a Hawthorne effect possible?

Noise and cognition Children exposed to chronic noise also experience: less persistent when it comes to completing tasks Poorer auditory discrimination Reduced physical growth Slower psychological development Poorer progress on standardized tests Lower tolerance for frustration Heightened blood pressure Lessened perceptions of control Lowered attentiveness Heightened distractibility

Make Up Exam Exam 1 & 2 make up: Friday, November 27 1 – 4 pm BSB 061 Only individuals who have provided proper documentation will be able to write the make up 4 essay questions worth 25 points each

Final Exam IN CLASS! DECEMBER 2