Week 4 — Readings & Resources · Sensation & Perception

Course: Introduction to Psychology (PSYC 1) · Silver Oak University (fictional sample) · Prof. Bennett
Objective covered: Objective 4 — Explain how humans sense and perceive the world.

How to use this page

Everything here is a link to an external resource — open it in your browser, the same way you'd open a YouTube link. Nothing needs to be downloaded.

This week's load is deliberately light: 4 short readings + 2 videos, grouped by the ideas from the lecture, plus one optional full-chapter reference. Read or watch one item per group and you're ready for the quiz; do all of them and you'll be very comfortable. Total time is roughly 45–55 minutes if you do everything, far less if you pick one per group.

Reading order that matches the lecture: ① sensation vs. perception + transduction → ② thresholds & psychophysics → ③ vision (the model sense) → ④ Gestalt + depth & illusions.

A habit to start now: as you read, keep testing the week's headline against your own experience — is this sensation (detecting) or perception (interpreting)? what is my brain adding that isn't in the raw signal?

① Sensation vs. Perception · and ② Transduction

Maps to Lecture Segments 2–3. Sensation is your receptors detecting physical energy; perception is your brain organizing and interpreting it. Transduction is the translation step in between.

Reading — "Bottom-Up Processing: Definition & Examples" (Simply Psychology)
🔗 https://www.simplypsychology.org/bottom-up-processing.html
Why it's assigned: the clearest plain-language version of the sensation-vs-perception split and bottom-up vs. top-down processing, with the face-recognition example we used in class — and it walks transduction at the retina, step by step.
⏱ ~8 min

Video — "Sensation and Perception: Crash Course Psychology #5"
🔗 https://www.youtube.com/watch?v=unWnZvXJH2o
Why it earns the click: a lively 10-minute tour of sensation vs. perception, sense thresholds, and exactly how human vision works — including rods, cones, and color vision (Segments 2 and 5). Plus a corgi.
⏱ ~10 min

② Thresholds & Psychophysics

Maps to Lecture Segment 4. The smallest stimulus you can detect (absolute threshold), the smallest change you can notice (difference threshold / JND), and why the JND is a constant proportion (Weber's law).

Reading — "Just Noticeable Difference (JND) in Psychology" (Simply Psychology)
🔗 https://www.simplypsychology.org/what-is-the-just-noticeable-difference.html
Why it's assigned: defines the difference threshold / JND and Weber's law in plain language with everyday weight-and-loudness examples — the perfect companion to the psychophysics segment, and it keeps the absolute vs. difference threshold straight (the exact pair chatbots love to conflate).
⏱ ~7 min

③ Vision — the Model Sense

Maps to Lecture Segment 5. Follow the light: cornea → pupil/iris → lens → retina, where rods (dim light) and cones (color & detail) transduce light into neural signals.

Reading — "Sensation versus Perception" (OpenStax Psychology 2e, §5.1, read online)
🔗 https://openstax.org/books/psychology-2e/pages/5-1-sensation-versus-perception
Why it's assigned: a tight, reputable walk-through of sensation, transduction, the absolute and difference thresholds, sensory adaptation, and the bottom-up/top-down distinction — with the candle-flame and signal-detection examples. (Read it online; nothing to buy. The full Chapter 5 continues into Vision in §5.3 if you want the eye in depth.)
⏱ ~10 min

④ Gestalt Organization · and Depth & Illusions

Maps to Lecture Segments 6–7. "The whole is more than the sum of its parts." The brain groups a scene (Gestalt), judges distance with depth cues, and — as illusions prove — constructs what you see.

Reading — "What is Gestalt Psychology? Theory, Principles, & Examples" (Simply Psychology)
🔗 https://www.simplypsychology.org/what-is-gestalt-psychology.html
Why it's assigned: walks through the grouping principles we named in class — figure-ground, proximity, similarity, closure, continuity — with clear everyday examples (the vase/faces, sports jerseys, the IBM logo), and explains why the brain organizes wholes automatically.
⏱ ~9 min

Video — "Perceiving is Believing: Crash Course Psychology #7"
🔗 https://www.youtube.com/watch?v=n46umYA_4dM
Why it earns the click: the perception half of the week — how the brain organizes and interprets sensations, why context and expectation shape what we see, and how illusions reveal that perception is constructed, not photographed (Segments 6–7).
⏱ ~10 min

Optional one-stop reference (free online text)

If you'd like one optional reference to skim all term, OpenStax Psychology 2e keeps its full text free to read online. Chapter 5 ("Sensation and Perception") covers everything in this week — the sensation/perception distinction, waves and wavelengths, vision, hearing, the other senses, and the Gestalt principles.
🔗 https://openstax.org/books/psychology-2e/pages/5-introduction
Why it's here: a reputable, currently-available reference you can return to in later weeks — entirely optional this week.

One more, if you're curious — Noba Project, "Sensation and Perception": a single free module that ties the whole week together (senses, transduction, perception, illusions).
🔗 https://nobaproject.com/modules/sensation-and-perception

Pick-one quick path (≈20 min total)

In a hurry? Do exactly these two and you'll be ready for the quiz:
1. Watch Crash Course Psychology #5 — Sensation and Perception (groups ①–③).
2. Read What is Gestalt Psychology? (group ④), and skim the JND/Weber's law intro (group ②).

Heads-up (links rot): these point to outside sites that occasionally move or rename pages. If a link ever fails, tell Prof. Bennett and use the OpenStax reference above in the meantime.