October 29th, 2010
Lecture 7: Attention & Scene Perception
Short Answer Question:
- You have a photoreceptor that might itself somehow contribute to colour
perception but alone is not colour-sensitive WKDW¶VEFWKHVLJQDOLV
- The problem of univariance is the fact that an infinite set of different
wavelength±intensity combinations can elicit exactly the same response from
a single type of photoreceptor. One photoreceptor type cannot make
accurate color discriminations based on wavelength.
- The solution LVWKDWZH¶YHPRUHWKDQRQHFRORXU-sensitive photoreceptor like
red, green and blue cones in our retinas. The combinations of the outputs of
these three types of cones ZLOODFWXDOO\WHOOXVZKDWFRORXUVZH¶UHORRNLQJDW
- The location of objects whose images lie on corresponding points. The surface of
6RWKLVLVDQDUHDZKHUHZHGRQ¶WKDYHdouble vision when we converge our eyes
- Attention can be directed at INPUTS, THOUGHTS & ACTIONS
- Able to process them & ignore other things
TOO MUCH arousal seems to activate all sorts of sensory inputs in a global way.
The person has problems concentrating as they will have problems ignoring things
that are irrelevant/ distracting.
We need attention
Both fecilatatory mechanisms (enhance & focus)
& inhibitory mechanism (ignore) will contribute
to what we call attention in multiple ways.
Arousal & Attention are clearly different things! But they do interact
with each other. The relationship between Arousal & attention ÆAs
arousal increases, the attention increases but further increases in
arousal could also bring about decreased attention.