Perception and Cognition

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271 Terms
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Cognition

Mental processes involved in acquiring, processing, and storing information

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Environmental stimulus

Physical or chemical energy from the external world that is detected by sensory receptors

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definition of motion

change over space and time

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stimulation in MT in non primate humans

induce percept of motion

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prosopagnosia vs object agnosia

prosopagnosia: inability to recognise face (self included). able to recognise objects

object: inability to recognise different types of objects by vision but can via touch but are able to draw from memory. able to recognise face

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Signal detection theory

Quantifies the ability to discriminate between stimuli and measure the amount of information in a stimulus

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Retina

Layer at the back of the eye that contains photoreceptors and converts light energy into neural signals

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Physical energy

Energy in the form of light or sound

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Chemical energy

Energy in the form of taste or smell

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Neural signals

Electrical signals generated by sensory receptors and transmitted to the brain

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Perceptual experience

Subjective interpretation of sensory information, resulting in conscious awareness

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Criterion

Decision threshold used to determine whether a stimulus is present or absent

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Sensitivity

Measure of the ability to detect weak stimuli or differences between stimuli

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Acuity

Measure of the ability to perceive spatial details or fine differences

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Cones

Photoreceptors in the retina that are responsible for color vision and high acuity

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Rods

Photoreceptors in the retina that are responsible for low-light vision and peripheral vision

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Central vision

Visual field focused on the central part of the retina, providing high acuity

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Peripheral vision

Visual field outside the central part of the retina, providing low acuity

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Receptive field

Area of the visual field that influences the activity of a neuron

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Off-center receptive field

Receptive field where the center inhibits the neuron and the surround excites the neuron

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Convergence

Combining inputs from multiple photoreceptors onto a single bipolar cell or ganglion cell

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Divergence

Spreading of information from a single input to multiple outputs

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Orientation tuning

Preference of a neuron to respond to stimuli with a specific orientation

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Motion vision

Ability to perceive and interpret visual motion

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MT (Middle Temporal) area

Cortical area strongly implicated in motion perception

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Akinetopsia

Motion blindness caused by damage to the MT area

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Ventral visual cortex

Cortical area involved in processing visual information related to object recognition and color perception

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Colour constancy

Ability to perceive the true color of an object despite changes in illumination

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Metamers

Different stimuli that are perceptually indistinguishable

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Trichromatic vision

Ability to perceive color using three types of cone photoreceptors

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Dichromatic vision

Ability to perceive color using only two types of cone photoreceptors

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Cerebral achromatopsia

Complete or partial loss of colour vision despite intact functioning due to damage in the ventral visual cortex —> damage to V4

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Surface reflectance

Proportion of each wavelength of light that a surface reflects

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Illuminants

Power at each wavelength of light illuminating a scene

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Filter

Translucent material that selectively transmits or absorbs certain wavelengths of light

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Colour constancy

Ability to perceive the true color of an object despite changes in illumination

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Colour perception

Subjective interpretation of the wavelengths of light reflected by objects

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Colour blindness

Inability or reduced ability to perceive certain colors

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Tetrachromatic vision

Ability to perceive color using four types of cone photoreceptors

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Cortical areas

Regions of the brain involved in processing specific types of information

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Memory

Mental process of encoding, storing, and retrieving information

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Colour perception

Subjective interpretation of the wavelengths of light reflected by objects

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Colour constancy

Ability to perceive the true color of an object despite changes in illumination

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Colour discrimination

Ability to distinguish between different colors

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what are 'hits' in signal detection theory?

correct discrimination of what between stimuli

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correct rejection (signal detection theory)

correct rejection of noise in the absence of noise

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false alarms (signal detection theory)

no stimulus, but response

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miss in signal detection theory?

signal present but subject response is no

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criterion in middle?

best possible correct percentage

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criterion on left

more chances to make false alarms to minimise misses

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criterion on right

more misses. do not want to stop what they are already doing

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which scenarios will have lower overall accuracy?

1. criterion in middle

2. criterion on left

3. criterion on right

2. criterion on left

3. criterion on right

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what is sensitivity?

being able to discriminate between noise and stimuli, independent of criterion

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no sensitivity?

no discrimination, chance

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high sensitivity in signal detection theory

distribution almost no overlap. almost perfect discrimination

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moderate sensitivity?

moderate overlap

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what information do we get if there is response only to the L-cone (long wavelength)?

not much information about intensity but unlikely for the room to be completely dark.

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what information do we get if there is response only to the L-cone (long wavelength) & M-cones?

more response in L-cones, light more likely to be reddish

M-cone, light likely to be greenish

if same, yellowish or bluish

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what info can we infer if L-cone is more responsive than the M-cone?

the light may have a higher sensitivity, longer wavelength, or lower intensity light that is close to the peak of L-cone sensitivity

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cognitive impenetrability give example

even knowing reality you cannot change your perception of a stimuli .

shepherds table illusion: table tops look different proportions if measure, they are same, knowing this you still see disproportion.

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perceptual competencies

emerge early in development and show bias towards convex stimuli. seen also in adults

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How can we test hearing in newborn babies?

EEG. newborns given headphones, and given bursts of sound to either ear and check expected response in auditory cortex.

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emergent properties. give example

where our brain can infer information about stimuli even there is limited sensory information

static point-lighter walker seen as several static dots but once move, they are seem to be human walking

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central vs peripheral vision

central - sensitive to changes in high and low spatial frequencies

peripheral - sensitive to low spatial info . lower acuity than central

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ocular dominance columns

striped pattern of ocular parts corresponding to light with dark regions for ipsilateral and contralateral input located in V1

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how do we lose balance

when visual motion signals are disrupted

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what information does form give

depth perception

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dimensions of visible colour

colour vision based on 3 cones; RBG

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history of trichromatic colour vision

L-cone mutation resulting in M-cone

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modular organisation

different visual areas that specifically encode information of a visual scene

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the binding problem

integrated visual experience, we experience a very unified and coherent percept

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issues with object recognition models

a lot of templates are needed even for simple objects

when there a lot of images together it is hard to process objects

it is hard to recognise unusual positions of a visual scene

we can identify many objects despite having different forms

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Q: What's in the inferior temporal cortex

A: ventral stream and large receptive fields

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Perception

Process of interpreting sensory information and making sense of the world

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Inputs

Sensory information received from the external environment

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Outputs

Perceptual experiences or mental representations produced by the brain

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Stages of perceptual processing

Environmental stimulus → Sensory receptors → Transduction → Neural activity → Perceptual experience

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Transduction

Conversion of physical or chemical energy into neural signals

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Black box

Metaphor for the brain, representing the unknown processes that occur between sensory input and perceptual output

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Neuroimaging

Techniques used to visualize and study brain activity

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what are the main characteristics of perception?

1. emergent properties

2. cognitive impenetrability

3. lack of detail

4. perceptual competencies

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what does it mean by lack of detail as one of the main components of perception? give example

we think our perception is detailed when in reality it is not

spot the difference and change blindness.

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what is visual angle

amount of retina the object takes up

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