Week 9 Readings Flashcards
(99 cards)
What is the first-person perspective?
Observations made by individuals about their own conscious experiences, also known as introspection or a subjective point of view. Phenomenology refers to the description and investigation of such observations.
What is contemplative science?
A research area concerned with understanding how contemplative practices such as meditation can affect individuals, including changes in their behavior, their emotional reactivity, their cognitive abilities, and their brains. Contemplative science also seeks insights into conscious experience that can be gained from first-person observations by individuals who have gained extraordinary expertise in introspection.
What was René Descartes’ position on the mind-body problem?
Descartes’ position, known as dualism, was that the mental and physical are different substances.
How does dualism contrast with reductionist views?
Dualism asserts that mental and physical phenomena are different substances, while reductionism claims that mental phenomena can be explained through physical phenomena.
What is a key factor in generating visual awareness?
Visual awareness depends on a reciprocal exchange of information between multiple brain areas, particularly between higher-level visual areas and the primary visual cortex.
What did Pascual-Leone & Walsh (2001) discover about visual awareness and motion perception?
They found that directly activating the visual motion area (V5) can make you see motion, but disrupting the feedback signal from V5 to the primary visual cortex prevents motion perception, highlighting the importance of this reciprocal exchange.
Why doesn’t paying full attention or deeply analyzing an image guarantee awareness of it?
Because visual awareness is not solely dependent on attention or analysis but requires a specific reciprocal exchange of information across brain areas.
How does brain damage to the primary visual cortex affect visual awareness?
Damage to the primary visual cortex can lead to cortical blindness, where the person claims not to see anything despite some preserved visual abilities.
What is cortical blindness?
Cortical blindness occurs when brain damage to the primary visual cortex results in a lack of conscious visual experience, even though other areas of the brain still receive visual input.
What explains the preserved visual abilities in people with cortical blindness?
Visual input may still reach other areas of the brain, such as V5, through projections from structures like the thalamus and superior colliculus, allowing unconscious detection of visual stimuli.
What is blindsight?
Blindsight is a condition where a person with cortical blindness can analyze and respond to visual stimuli without conscious awareness, often detectable only through tasks requiring guessing.
Why can’t a person with cortical blindness consciously perceive visual stimuli despite V5 activation?
The reciprocal exchange of information between V5 and the damaged primary visual cortex is disrupted, preventing conscious visual awareness.
What role does neural synchronization play in visual awareness?
Neural synchronization enhances communication between neural populations by aligning their excitability cycles, which is crucial for generating visual awareness.
How does synchronization of neural excitability enhance communication?
Communication is enhanced when one neural population transmits information during its excitable phase and the target population receives it in its excitable phase, promoting efficient information exchange.
Which oscillatory frequencies are associated with visual awareness?
Beta-band (13–30 Hz) and gamma-band (30–100 Hz) neural synchronization frequencies are closely linked with visual awareness.
What does the Global Neuronal Workspace Theory of Consciousness propose?
It suggests that visual awareness arises from the sharing of information across prefrontal, inferior parietal, and occipital regions of the cerebral cortex through synchronized neural activity.
What does the Information Integration Theory of Consciousness propose?
It proposes that consciousness arises from the complexity of shared information. The more complex and intricately interrelated the shared information, the richer the conscious experience.
Minimal consciousness occurs when the structure of shared information is simple, while rich conscious experiences arise when the structure is complex and intricately interrelated.
How is complexity defined in the Information Integration Theory?
Complexity refers to the number of interrelated informational units or ideas generated by a web of local and global sharing of information.
What happens when all neurons are connected to every other neuron?
If all neurons are connected, they tend to activate together, generating few distinctive ideas, leading to a low level of consciousness.
What happens with very low neuronal connectivity?
With low connectivity, neurons activate independently, generating numerous but unassociated ideas, which also results in a low level of consciousness.
What neural structure promotes a rich level of consciousness?
A suitable mixture of short-, medium-, and long-range neural connections is needed to promote a rich level of consciousness, as seen in the human cerebral cortex.
How does the Information Integration Theory suggest consciousness can be measured?
Consciousness is conceptualized as graded rather than all-or-none, allowing for a quantitative approach to estimate levels of consciousness in nonhuman species and artificial beings.
What is episodic recollection?
Episodic recollection is the ability to reexperience the past and virtually relive an earlier event, representing the pinnacle of conscious human memory functions.
What type of memory is disrupted in people with amnesia due to neurological damage?
Declarative memory, which involves conscious remembering of events and facts, is disrupted in people with amnesia.