1. a spatiotemporal window a photograph does not capture everything in a scene,
but only part of it which is within a spatiotemporal window (ex an image in a
photo can only display a pic that is taken at a certain perspective, and not
everything in a scene would be captured in a single pic… so any image is defined
to some extent by its spatiotemporal window)
2. storage units image contains an array of storage units (like pixels of a digital
camera) in a grid. Each storage unit is sensitive to the light hitting on it. Each
storage unit also has a spatiotemporal window, it captures only the info within a
bounded spatial and temporal region.
3. stored information Each storage unit gives us information of the light
intensity at visible wavelengths. The collective information of the light intensity
AND light wavelength gives us the stored information
These 3 elements (spatiotemporal window, storage units, and stored information), taken
together, determines the images CONTENT
Much scientific evidence supports the presence of images in the human brain. In an
experiment on a monkey, found that the pattern of brain activation on the brains surface
roughly depicts the shape of the stimulus. The reason is that the cortex of early visual
processing areas is laid out somewhat like the pixels of a digital image and responds
similarily. When neurons arranged in this manner fire, the pattern of activation forms a
topographical map – their spatial layout in the brain is analogous to the layout of space in
Much research has shown that visual images are represented partly in the brains
OCCIPITAL lobes, and that the brain represents these images topographically.
Because visual images are represented in the occipital lobes, removing the right occipital
lobe should reduce image size by one-half.
***Not only have mental images been found in the visual system, they have also been
found in the motor system, and in the auditory system
In an experiment, asked participants to construct mental images while performing a task.
If the participants actually constructed mental images, then these images should have
perceptual qualitites, such as color, shape, size etc. They indeed found that participants
had constructed mental images having perceptual qualities.
Brain images differ significantly from those taken by a camera. Brain images are NOT as
continuous and complete as photographs. The failur to be aware of changing stimuli in
the visual field indicates that peoples perceptual images do not have uniform level of
detail; some areas are not as well represented as others. Visual attention appears to be
responsible for this unevenness
So much behavioural evidence has also accumulated for mental images